Box tree moth Quarantine Expanded; Now includes Cumberland, Atlantic, and Cape May Counties

UPDATE: Emergency BTM Compliance Agreement Meeting with NJDA

– Seabrook Firehouse, 3PM – Monday 31st

(Free – just show up if within a quarantined county)

90 Foster Road, Bridgeton (Upper Deerfield Township), NJ 08302

 

This PPA post has no legal bearing. 

This is a long but extremely important post about the expansion of the Box Tree Moth (BTM) Quarantine into the major boxwood production counties of New Jersey. This impacts everyone in NJ – Please read this message.

What is box tree moth:

Box Tree Moth (Cydalima perspectalis) is an invasive insect pest native to East Asia, as its larvae are voracious feeders that can completely defoliate and kill Boxwood (Buxus species) plants. The aggressive, destructive nature of the Box Tree Moth’s caterpillar life stage makes it essential to quickly take action as soon as damage is detected as defoliation can occur within 10 days. The risk of human movement of infested nursery stock, plant material, and debris will rapidly expand the pest’s range. The nursery and landscape industries that rely on Boxwood plants generate more than $9.8 million in economic activity annually within New Jersey and an estimated $140 million annually throughout the United States, according to data provided by the United States Department of Agriculture (“USDA”) National Agricultural Statistics Service. The New Jersey Department of Agriculture (“Department”) has determined the Box Tree Moth to be an injurious insect that is dangerous and destructive to the horticultural and agricultural industries, residential landscapes, and heritage plantings of Boxwood plants throughout the State.

On June 10, 2026, the USDA Animal and Plant Health Inspection Service (USDAAPHIS) confirmed that Box Tree Moth was detected on residential plantings in Middle Township, Cape May County, New Jersey, and this was the first confirmed detection of this pest in New Jersey.

On August 21, 2026, the Department and USDA staff further detected Box Tree Moth on residential plantings in Commercial Township, Cumberland County, New Jersey; and the detection of Box Tree Moth in Cumberland County also threatens the nearby area of Atlantic County. USDA-APHIS has previously detected Box Tree Moth in Massachusetts, New York, Pennsylvania, Delaware, Maryland, Virginia, West Virginia, Kentucky, Ohio, and Michigan, and every one of these states established intrastate quarantines that restrict the movement of host plants, plant parts, and any articles capable of harboring life stages of the Box Tree Moth.

All life stages of box tree moth are active in southern NJ as of today, 8/27/2026.

What is happening: Expansion of quarantine into Cumberland and Atlantic Counties

Box tree moth quarantine expanded to Cumberland and Atlantic counties.
Important information from: Box Tree Moth Quarantine Order for Cape May, Cumberland and Atlantic Counties New Jersey State Board of Agriculture,  Approved by State Board of Agriculture on August 26, 2026 – PLEASE READ THE DOCUMENT – This is a ‘Stop Shipment’ level event in those counties. 

C.  Quarantine area

  1. By order of the State Board of Agriculture pursuant to N.J.S.A. 4:1-21.5 and N.J.S.A. 4:7, in order to control the spread of Box Tree Moth the following Counties are hereby quarantined:
  2. Cape May County
  3. Cumberland County
  4. Atlantic County
  5. This Order shall not be construed to limit the Department’s authority to quarantine additional counties, as necessary, consistent with its existing statutory authorities.”

&

“II. THEREFORE BE IT FURTHER RESOLVED, that the following requirements and restrictions concerning the movement of Boxwood plants, debris, and other regulated articles shall take effect:

Restrictions on movement of plant material; Disposal

  1. No business may move any regulated articles listed in this Order outside the quarantine area designated in this Order without a signed Compliance Agreement and certification issued by the Department. 
  2. A private individual or non-business entity seeking to move any regulated articles listed in this Order outside the quarantine area designated in this Order (Cape May, Cumberland, and Atlantic Counties) must first receive prior written authorization from the Department.
  3. Infested or dead Regulated articles must be disposed of within the designated quarantined area (Cape May, Cumberland, Atlantic Counties). This requirement is applicable to all businesses, including those with a signed Compliance Agreement and certification.

Regulated articles

  1. Regulated articles are as follows:
  2. Boxwood plants (Buxus species).
  3. Boxwood plant debris or dead boxwood plant material;
  4. The Box Tree Moths at any life stage; and d. Any means of conveyance for the Boxwood plant including, but not limited to: soil, pots, containers, and truck beds, or when it is determined by the Department that the regulated article presents a risk of spreading Box Tree Moth.”

&

F.  Mandatory Compliance Agreement for businesses; certification

  1. No regulated articles may be moved out of the designated quarantine area of Cape May, Cumberland and Atlantic Counties, unless in compliance with the requirements set forth in this section.
  2. Businesses moving regulated articles out of the quarantine area are required to sign a Compliance Agreement and receive a certification issued by the Department prior to moving the regulated articles.
  3. The technical requirements, specifications, and standards for compliance with this Order are set forth in the Compliance Agreement labeled “BTM Compliance Agreement” at https://www.nj.gov/agriculture/divisions/pi/prog/BoxtreeMoth.shtml (www.nj.gov/agriculture/divisions/pi/pdf/2026_BTM%20NJ%20Comp%20Agmt.pdf)
  4. This includes technical requirements for the proper use of traps, pre-inspections of plant materials, employee training requirements, recordkeeping requirements, and the proper use of insecticides.
  5. The “Pest Management Plan“” required by the Compliance Agreement shall be considered satisfied by the execution of the compliance agreement itself.
  6. The “Certification” referenced in the Compliance Agreement is a general-use certificate authorizing a business to move Boxwood plants and other regulated articles out of the quarantine area in compliance with these rules. The Department does not require individual certificates for individual movements of regulated articles by businesses.”

If you operate in Cumberland, Cape May, & Atlantic Counties: 

  1. Read and understand:
  2. Visit the NJ Department of Agriculture Box Tree Moth (BTM) webpage
  3. Start the process of obtaining the mandatory traps, pheromone lures, and pesticide strips.
    1. From Compliance Agreement – 
    2. Below is from the NJDA BTM website (linked above)
      1. Alpha Scents, Inc:
      2. Evergreen Growers Supply
      3. ChemTica
      4. Great Lakes IPM
      5. Trece
  4. Note: If you have already been utilizing the monitoring traps – please contact your local nursery inspector to expedite the Compliance Agreement process and ability to resume shipping. 
  5. Seek Compliance Agreement training:
    1.  Contact your local NJDA Nursery inspector to establish training appointments.
    2. Attend the Rutgers/NJDA/NJNLA BTM Training session on Sept. 17th – see details below. This is open to operators both within and outside of the quarantined counties and will count as the mandatory first step in Compliance Agreement training, regardless of your counties quarantine status.
  6. Understand the mandatory pesticides as described in the Compliance AgreementSee Appendix 1. Insecticides for BTM control

Steps to take if you see this pest: 

  1. Report BTM observations
  2. THEN Eradication:
    • Treat infested plants with Compliance Agreement cited materials (within Compliance Agreement – Appendix 1). Follow all label requirements, especially REIs. The label is the law.
    • Only after treatment efficacy has been confirmed and REI completed can you consider moving to the next step.
  3. (If applicable) Removal:
    • Once REI is complete, and the pesticide treatments are lethal to BTM, remove infested boxwoods. Boxwoods should be double bagged and taken to an in-county municipal dump.

Please educate yourself about this pest – Resources

If you see any significant amount of caterpillars in a boxwood plant it is EXTREMELY likely to be Box Tree Moth (BTM)

Box Tree Moth (BTM) Compliance Agreement Training + Rutgers RAREC Nursery Twilight 9/17/2026 

Nursery & Ornamentals Twilight Meeting

Collaboratively held by RCE, NJNLA, & NJDA

Location: Rutgers Agricultural Research and Extension Center (RAREC)

121 Northville Rd., Bridgeton, NJ  08302-5919

 

3:00PM to 4:00PM: 

Meeting: Box Tree Moth Compliance Agreement Training – Collaboratively held by RCE, NJNLA, and NJDA.

Please join if you grow, manage, or transport boxwoods. This official NJDA training satisfies the first mandatory requirement to be in compliance if the quarantine expands.

Anticipated credits: 2-PP2, 2-3A, 2-9, Certificate of Completion

_______________________________

4:00PM to 7:30PM:

Meeting: Rutgers Agricultural Research and Extension Center (RAREC) – Nursery & Ornamentals Twilight

Collaboratively held by RCE & NJNLA

4:00 pm – Arrival / Networking / Vendors / Look at plots

4:30 pm – Dinner (BBQ Boyz) / Networking / Vendors

5:30 pm – Presentation (1hr): (Outside) Ornamental IPM Implementation (Waller & Errickson)

6:30 pm – Presentation (1hr): (Inside) CORE SAFETY UPDATES (Presenter TBD)

7:30PM – Adjourn and signing for credits

Anticipated credits: 2-PP2, 2-CORE, 2-3A, 2-2, 2-1A, 2-10

Registration is required – Click here to register (select Guest if not a NJNLA member) (link fixed*)

Nursery & Ornamentals Twilight Meeting Collaboratively held by RCE and NJNLA Location: Rutgers Agricultural Research and Extension Center (RAREC) 121 Northville Rd., Bridgeton, NJ 08302-5919 3:00PM to 4:00PM: Meeting: Box Tree Moth Compliance Agreement Training - Collaboratively held by RCE, NJNLA, and NJDA. Please join if you grow, manage, or transport boxwoods. This official NJDA training satisfies the first mandatory requirement to be in compliance if the quarantine expands. Anticipated credits: 2-PP2, 2-3A, 2-9, Certificate of Completion _______________________________ 4:00PM to 7:30PM: Meeting: Rutgers Agricultural Research and Extension Center (RAREC) – Nursery & Ornamentals Twilight Collaboratively held by RCE & NJNLA 4:00 pm – Arrival / Networking / Vendors / Look at plots 4:30 pm - Dinner (BBQ Boyz) / Networking / Vendors 5:30 pm – Presentation (1hr): (Outside) Ornamental IPM Implementation (Waller & Errickson) 6:30 pm – Presentation (1hr): (Inside) CORE SAFETY UPDATES (Presenter TBD) 7:30PM – Adjourn and signing for credits Anticipated credits: 2-PP2, 2-CORE, 2-3A, 2-2, 2-1A, 2-10

Registration is required – Click here to register (select Guest if not a NJNLA member)  (link fixed*)

Box Tree Moth CONFIRMED in Cape May, NJ

Cape May County NJ, with inset of Rio Grande (township)
Cape May County NJ, with inset of Rio Grande (township)

Box tree moth (BTM) has been confirmed in Cape May County, NJ.

An official NJDA press-release expected within days – this PPA post has no legal bearing. 
  • What is happening:
  • Box tree moth (Cydalima perspectalis) has been reported and Federally confirmed in the area of Rio Grande, Cape May County.
  • USDA and NJDA have established a monitoring zone surrounding the infestation.
  • A quarantine will be established for all of Cape May County, NJ.
  • The quarantine will apply to ANYONE moving boxwoods out of Cape May County
  • NJDA has an official reporting tool and website for BTM
  • If you see this pest 1) Report it, 2) Eradicate it, 3) remove it (if applicable) following guidelines

 

 

 

Please click the read more tab below for important information
[Read more…]

Scale crawlers, updated 2026 scouting guide, IPM webinars, Box tree moth

Educational Resource Update: 

Stay informed

  • Sign up for the 2026 – Rutgers Ornamental IPM Program – click here to sign up
  • Program is free, but registration is required – Registration includes:
    • Site visit to your ornamental nursery/farm from Rutgers agents
    • Delivered printed IPM resources (Guides, factsheets, bulletins)
    • Free pheromone & sticky trap kit + guidance on setup/monitoring (for commercial nursery/greenhouse and Christmas tree farms)
    • Access to live bi-weekly webinars (Zoom)
    • (Next session – TUESDAY 6/9 @ 12PM) – Guest Speaker Dr. Richard Cowles – Connecticut Ag Exp. Station – Scale Management 
    • Every Second and Fourth, Tuesday, April through September
  • Visit the Rutgers Ornamental IPM Website Rutgers Ornamental IPM Website (click here) for updated webinar videos.

Scale crawler emergence predictions throughout NJ. 

Now is an excellent time to be scouting for crawler emergence using double sided (or doubled over – sticky side out) tape. Targeting scale insects is most successful during their crawler periods, however this should be visually confirmed for greatest efficacy. For more information on installing this type of IPM trap and others please see – Setting up and deploying IPM traps – Tutorial Video 2026 (click here).

Common Name GDD RANGE Target Stage SOUTH – Upper Deerfield (NJ50) CENTRAL – Howell (NJ10) NORTH – Randolph NJ (AU137)
MIN MAX START STOP START STOP START STOP
Cottony camellia / taxus scale (soft) 520 Crawlers (only) 17-May 20-May 18-May
Euonymus scale 533 820 Crawlers (Gen 1) 18-May 3-Jun 21-May 8-Jun 18-May 7-Jun
*Cryptomeria scale 600 800 Crawlers (Gen 1) 20-May 2-Jun 27-May 7-Jun 24-May 6-Jun
*Sprucebud scale (soft) 700 1150 Crawlers (only) 27-May 18-Jun 2-Jun 24-Jun 30-May 25-Jun
White prunicola scale 707 1151 Crawlers (Gen 1) 28-May 18-Jun 2-Jun 24-Jun 30-May 25-Jun
*Juniper scale 707 1260 Crawlers (Gen 1) 28-May 18-Jun 2-Jun 24-Jun 30-May 25-Jun
Calico scale (soft) 714 Crawlers (only) 28-May 2-Jun 31-May
Striped pine scale (soft) 750 800 Crawlers (only) 30-May 2-Jun 4-Jun 7-Jun 2-Jun 6-Jun
Oak lecanium scale (soft) 789 Crawlers (only) 1-Jun 6-Jun 5-Jun
Cottony maple leaf scale (soft) 802 1265 Crawlers (only) 2-Jun 23-Jun 7-Jun 29-Jun 6-Jun 30-Jun
Cottony maple scale (soft) 802 1265 Crawlers (only) 2-Jun 23-Jun 7-Jun 29-Jun 6-Jun 30-Jun
Golden oak scale (Pit) 802 1266 Crawlers (only) 2-Jun 23-Jun 7-Jun 29-Jun 6-Jun 30-Jun
Japanese maple scale 829 Crawlers (Gen 1) 3-Jun 9-Jun 7-Jun
European elm scale (soft) 831 1388 Crawlers (only) 4-Jun 27-Jun 9-Jun 4-Jul 8-Jun 6-Jul
European fruit lecanium scale (soft) 932 1645 Crawlers (only) 9-Jun 7-Jul 14-Jun 14-Jul 14-Jun 17-Jul

*Conifer / Christmas Tree scales

Please visit the Rutgers Ornamental IPM Website – Pest and Disease Index (click here) for more detailed information on specific scale species management and pesticide considerations.

Box tree moth – stay vigilant looking for this pest

Box Tree Moth (Cydalima perspectalis) is alive and well in MD, DE, VA, WV, NY, OH, MI, MA. Please report this pest to twaller@njaes.rutgers.edu

If this pest does make its way into New Jersey, and quarantines are established, nurseries will be required to comply with a federal compliance agreement if shipping out of potential quarantine areas. Please review this document if boxwoods are an important crop for you. Compliance Agreement for Production Nurseries in BTM Regulated Nurseries (click here)

Box tree moth caterpillars. Photo credit: USDA.

Multiple Pest Alerts in nursery, landscape, Christmas tree – boxwood blight, ambrosia beetle, white pine weevil, clearwing borers, and Phytophthora management

In response to the increased air temperature highs and averages, accumulating growing degree-days, increasing soil temperatures, and expected rainfall and overcasts days the following pest alerts have been generated for boxwood blight, ambrosia beetle, white pine weevil, and clearwing borers. Oomycete/Phytophthora treatment considerations are also listed at the bottom of the posting.

Stay informed:

  • Sign up for the 2026 – Rutgers Ornamental IPM Program – click here to sign up
  • Program is free, but registration is required – Registration includes:
    • Site visit to your ornamental nursery/farm from Rutgers agents
    • Delivered printed IPM resources (Guides, factsheets, bulletins)
    • Free pheromone & sticky trap kit + guidance on setup/monitoring (for commercial nursery/greenhouse and Christmas tree farms)
    • Access to live bi-weekly webinars (Zoom)
    • (First session TUESDAY 4/14 @ 12PM)
    • Every Second and Fourth, Tuesday, April through September

Boxwood Blight: high potential for new /spreading infections this week in Southern NJ

[pictorial tri-fold] Common Boxwood Pests and Diseases (click-here). This includes Box Tree Moth images. Print the PDF out double-sided, then fold.

If you suspect Boxwood Blight and would like to have this verified – please contact the Rutgers Plant Diagnostic Laboratory (click here) for sample submission instructions

Boxwood Blight Risk Assessment as of 3/30/2026
Region Location CODE MON TUE WED THU FRI SAT
30-Mar 31-Mar 1-Apr 2-Apr 3-Apr 4-Apr
Southern Upper Deerfield NJ50 Very Low  Low  Very Low  Infection Risk Very Low  Infection Risk
Southern Vineland NJ73 Very Low  Low  Very Low  Infection Risk Low  Infection Risk
Southern Millville KMIV Very Low  Very Low  Low  Infection Risk Very Low  Infection Risk
Southern Bridgeton D4116 Very Low  Low  Very Low  Infection Risk Very Low  Infection Risk
Southern Mays Landing G4661 Very Low  Very Low  Very Low  Low  Very Low  Infection Risk
Central Howell / Freehold NJ10 Very Low  Low  Very Low  Low  Very Low  Low 
Central Princeton F0303 Very Low  Low  Very Low  Low  Very Low  Low 
Central Somerville F6261 Very Low  Low  Very Low  Low  Very Low  Low 
Northern High Point NJ59 Very Low  Low  Very Low  Very Low  Very Low  Very Low 
Northern Randolph AU137 Very Low  Low  Very Low  Very Low  Very Low  Very Low 
Northern Belvidere E7133 Very Low  Low  Very Low  Low  Very Low  Low 
Please check your local boxwood blight risk at (https://uspest.org/risk/boxwood_app)

Fungicides; 

  1. You very well may have these materials already applied as ‘cover-sprays’ – But – be mindful that protectant fungicides loose efficacy the more rain (or overhead irrigation) they are subjected to, and reapplication may be warranted.
  2. ROTATE between Fungicide Resistance Action Committee (FRAC codes) to avoid this pathogen becoming resistant to specific chemicals

Format: [FRAC code]: Chemical name (Trade names * no endorsement implied, other options exist)  

  • [M05]: Chlorothalonil (Daconil WS)
  • [M05 + 1] Chlorothalonil + Thiophanate methyl (Spectro 90WDG)
  • [11] Trifloxystrobin + [7] Fluopyram  (Broadform)
  • [11] Trifloxystrobin + [3] Triadimefon (Armada 50WDG)
  • [M03] Mancozeb
  • [12] Fludioxonil (Medallion WDG)
  • [3] Tebuconazole (Torque)BW

Approaching boxwood blight season – 2026 (threat this week in Central and Southern NJ)


Ambrosia beetle adult flight will VERY LIKELY occur this week throughout most of NJ. 

The last few seasons we have seen an upswing in ambrosia beetle activity in nursery production, principally in field grown nursery stock of thin barked trees (commonly – dogwood, honey locust, magnolia, maple, redbud, zelkova, styrax, Prunus spp.). Based on evidence from multiple lines of trap collection data throughout the United States, adult female flights appear to be correlated to consecutive days (2-3) of 70F temperatures (highs) with daily average air temps around 65F (max+min/2), i.e. THIS WEEK IN NJ.

Consider using pyrethroids in your production areas if this pest has been a regular problem OR there are water stressed (typically flooded / slow draining) plants.

(generic) Ambrosia Beetle Flight Predictions – as of 3/30/2026 
Region Location Metric MON TUE WED THU FRI SAT SUN MON TUE WED
30-Mar 31-Mar 1-Apr 2-Apr 3-Apr 4-Apr 5-Apr 6-Apr 7-Apr 8-Apr
Southern Millville High Temp [ºF] 69 78 82 55 71 77 75 59 59 58
Low Temp [ºF] 57 62 50 45 58 57 47 40 41 43
Average [ºF] 63 70 66 50 64.5 67 61 49.5 50 50.5
High at/above 70ºF FALSE TRUE TRUE FALSE TRUE TRUE TRUE FALSE FALSE FALSE
Avg at/above 65ºF FALSE TRUE TRUE FALSE FALSE TRUE FALSE FALSE FALSE FALSE
Adult flight risk Probable flight Potential flight
Central Freehold High Temp [ºF] 71 80 83 48 67 75 75 59 58 58
Low Temp [ºF] 57 63 45 42 58 52 46 40 41 42
Average [ºF] 64 71.5 64 45 62.5 63.5 60.5 49.5 49.5 50
High at/above 70ºF TRUE TRUE TRUE FALSE FALSE TRUE TRUE FALSE FALSE FALSE
Avg at/above 65ºF FALSE TRUE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE
Adult flight risk Probable flight Potential flight
Northern Hackettstown High Temp [ºF] 70 77 75 47 65 75 69 57 58 57
Low Temp [ºF] 55 60 45 39 54 49 42 36 38 39
Average [ºF] 62.5 68.5 60 43 59.5 62 55.5 46.5 48 48
High at/above 70ºF TRUE TRUE TRUE FALSE FALSE TRUE FALSE FALSE FALSE FALSE
Avg at/above 65ºF FALSE TRUE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE
Adult flight risk Potential flight Minor risk
Air temperatures: Weather Underground (https://www.wunderground.com/) and NEWA: (https://newa.cornell.edu/)
Compiled by Waller. T. 3/30/2026 [twaller@njaes.rutgers.edu]

Contact insecticides: 

  • Pyrethroids [3A]: –thrins (bifenthrin, permethrin, etc.) – Pyrethroids longer lasting residual activity is why these materials are so effective against ambrosia beetles. 
  • Systemic insecticides DO NOT WORK

Ambrosia Beetle Borers of Nursery Plants


White Pine Weevil (WPW) may have already emerged during the last heat wave, but if not, it will very likely occur this week throughout NJ.

Factors leading to this post include increased air temperatures and climbing growing degree-days (WPW adult movement and egg laying is around 7-58 growing degree-days (GDD50)), and most importantly rising soil temperatures as this pest typically begins movement with soils hovering around 50F. All of these factors lead to WPW movement this week and growers may wish to utilize a preventative, long lasting residual spray (pyrethroids) to target adults before they begin egg laying in the upper canopy.

So we have: 

  • Within the GDD window for adult movement and egg laying (~58 GDD50)
  • Soil temperatures in NJ are at or above 50F.
  • Increased air temperatures and insect mobility
White Pine Weevil (Pissodes strobi) – as of 3/30/2026 
Region Location CODE METRIC MON TUE WED THU FRI SAT
30-Mar 31-Mar 1-Apr 2-Apr 3-Apr 4-Apr
Southern Upper Deerfield NJ50 GDD50 81 98 117 117 117 118
High Temp [ºF]  (Average) 69 (63) 78 (70) 82 (66) 55 (50) 71 (64.5) 77 (65)
24hr Average –       Soil TEMP [ºF] 54 <- (This will change over time / no prediction available)
Central Freehold / Howell NJ10 GDD50 68 83 100 100 100 100
High Temp [ºF]  (Average) 70 (64) 80 (71.5) 83 (64) 48 (45) 67 (62.5) 75 (63.5)
24hr Average –       Soil TEMP [ºF] 55 <- (This will change over time / no prediction available)
Northern HACKETTSTOWN G5633 GDD50 59 72 89 89 89 89
High Temp [ºF]  (Average) 69 (62) 77 (68.5) 75 (60) 47 (43) 65 (59.5) 75 (62)
24hr Average –       Soil TEMP [ºF] 54 <- (This will change over time / no prediction available)
USPEST.ORG – Model: simple average/growing degree-day, Min: 50F – Max: 95F, NMME forecast
GDD Forecast:  7-month NMME based seasonal climate forecast (USPEST.ORG) – Subject to change regularly = Check Often
Air temperatures: Weather Underground (https://www.wunderground.com/) and NEWA: (https://newa.cornell.edu/)
Soil temperatures (10cm): https://www.greencastonline.com/tools/soil-temperature
Compiled by Waller. T. 3/30/2026 [twaller@njaes.rutgers.edu]

Chemical Controls for WPW at this stage of the season:

Chemical insecticides against white pine weevils during the spring period are only effective when adults are feeding & before females lay eggs. Arial sprays only need to be applied to cover the terminal leaders at the tops of trees. Pyrethroids sprayed on the bark can have an effective residual of up to 3-weeks. Included within this group of insecticides include bifenthrin (e.g., Onyx), permethrin (e.g., Astro) & cyfluthrin (e.g., Tempo). Since an extended egg-laying duration occurs with this pest, a second application may be recommended.

White Pine Weevil: Overwintering Adults Become Active in March & April


Clearwing borers: Be prepared to manage these pests in the coming weeks.

If you are a commercial grower signed up for the 2026 Rutgers Ornamental IPM program (click here to register), please contact twaller@njaes.rutgers.edu for clearwing pheromone trap kits.

Clearwing Borer Flight (GDD model) as of 3/30/2026
Events / Pests Southern NJ  Central NJ Northern NJ
 UPPER DEERFIELD (NJ50) HOWELL (NJ10) RANDOLPH (AU137)
Date DDs Date DDs Date DDs
* START * 1-Jan 0 1-Jan 0 1-Jan 0
* NOW * 29-Mar 76 29-Mar 64 29-Mar 71
Lilac / Ash Borer (Podosesia syringae) 18-Apr 149 30-Apr 151 5-May 153
Dogwood Borer (Synanthedon scitula) 19-Apr 154 1-May 158 6-May 161
Lesser peach tree borer (Synanthedon pictipes) 12-May 362 21-May 352 25-May 352
Rhododendron borer (Synanthedon rhododendri) 23-May 516 1-Jun 515 5-Jun 513
Greater peach tree borer (Synanthedon exitiosa) 27-May 583 5-Jun 584 9-Jun 578
USPEST.ORG – Model: simple average/growing degree-day, Min: 50F – Max: 95F, NMME forecast
Forecast:  7-month NMME based seasonal climate forecast (USPEST.ORG) – Subject to change regularly = Check Often
Compiled by Waller. T. 3/30/2026 [twaller@njaes.rutgers.edu]

Identifying Clearwing Moth Borers in Pheromone Traps


Early season management of Phytophthora, Pythium, Phytopythium should be initiated throughout NJ in sensitive plant species, areas with known histories of disease, and in Christmas tree plantations.  

Oomycide Considerations in Ornamentals – (Phytophthora, Pythium, Phytopythium)
Prepared by T. Waller – Rutgers Cooperative Extension – 2026 for use in New Jersey
FRAC Risk
of pathogen resistance
Active ingredient Tradename
examples*
(Review each specific label)
Notes
Translocation Movement in plant
P07 Low Phosphonates.
Aluminum tris (O-ethyl phosphonate)
Areca, Aliette,
generic fosetyl-Al
See label. Foliar and drench/soil reapplication interval is 30d or greater. Do not apply group P07 and copper-based
fungicides within 14d of one another
Fully systemic – xylem and phloem mobile (amphimobile)
P07 Low Phosphonates. Mono-and di- potassium salts of phosphorus acid Alude, Reliant, Rampart, K-Phite 7LP See label. Generally, soil drench minimum reapplication interval is 30d and foliar applications, less than. Do not apply group P07 and copper-based fungicides within 14d of one another Fully systemic – xylem and phloem mobile (amphimobile)
40 Low to Medium Dimethomorph, Mandipropamid Stature SC, Micora See label. Foliar, drench, soil directed, and chemigation applications. Translaminar systemic
– local translocation
40 + 45* Medium + High* Dimethomorph + ametoctradin* Orvego See label. Foliar, drench, soil directed, and chemigation applications. Translaminar systemic
– local translocation
49 Medium to High Oxathiapiprolin Segovis See label for use restrictions and tank-mix compatibility. Xylem mobile systemic
– translocation upwards (acropetal)
11 High Fenamidone Fenstop See label: Now labeled for outdoor nurseries. Reapplication interval is 28d Xylem mobile systemic
– translocation upwards (acropetal)
43 Medium Fluopicolide Adorn See label. Foliar, drench, and chemigation applications. No more than 2 applications per crop cycle. Minimum reapplication interval – 14d. Xylem mobile systemic
– translocation upwards (acropetal)
4 High Mefenoxam Subdue Maxx, Subdue GR, generic Mefenoxam See label. Typically, spring and fall drench applications with total allowable of 6lb/A/year (Subdue Maxx). Foliar, drench, soil directed, soilless media incorporation, and chemigation applications. See label for minimum reapplication intervals for drench applications (ranging from 3 weeks to 4 months). Mefenoxam resistance has been detected in the USA. Xylem mobile systemic
– translocation upwards (acropetal)
21 Medium to High Cyazofamid Segway-O, Celoxid SC See label. Minimum reapplication interval 14 – 21d. No more than 2 applications per crop cycle.
Applied as drench or soil
directed.
Protectant – no systemic activity
BM02 Unknown (likely low) Biologicals Rhapsody (bacteria), Root Sheild Plus (fungi) See label. Reapplication interval typically very rapid at 3-10d. Antagonistic – hinders pathogen colonization of host tissues
Quaternary ammoniums KleenGrow, Uptake, Physan 20, Green Shield See label. Typically used in sanitation efforts, irrigation maintenance (biofilms), and some labels allow for application to plant surfaces.
Phytotoxicity concerns are rate and label specific. Generally considered broad spectrum fungi/bacteria/oomycete pesticides.
Direct contact – varying residual activity, no systemic activity
Hydrogen dioxides Zerotol, Oxidate

PESTICIDE USE DISCLAIMER. THE LABEL IS THE LAW . The Rutgers Plant and Pest Advisory is not intended for homeowners. Recommendations and considerations given herein are designed to be specific to the state of New Jersey, even though it may be broadly applicable across multiple geographic areas. A pesticide applicator is legally bound by the labeling found on and with the pesticide container in their possession. Before using a pesticide, check and always follow the labeling distributed with the product at the point of sale for legally enforceable rates and restrictions. New Jersey notes. 1. Private and commercial applicators must be certified AND possess a valid applicator license to make applications or supervise the use of ANY* EPA-registered pesticide (*as required NJAC 7:30; limited exemptions exist). 2. Only certified applicators possessing a valid New Jersey applicator license may purchase restricted use pesticides (RUPs). 3. Pursuant to NJ S1016, neonicotinoids can only be applied in agricultural settings. Commercial applications in outdoor, non-agricultural settings (i.e. landscapes) is prohibited, with no pest-specific exceptions, as of the printing of this document. In addition to the pesticide chemistries and Mode of Action (MoA) listed in this document, others may be commercially available. It is understood that no discrimination is intended and no endorsement by Rutgers Cooperative Extension is implied. THE LABEL IS THE LAW. Cooperating Agencies: Rutgers, The State University of New Jersey, U.S. Department of Agriculture, and Boards of County Commissioners, Rutgers Cooperative Extension, a unit of the Rutgers New Jersey Agricultural Experiment Station, is an equal opportunity program provider and employer.

ALERT: Be prepared to manage White Pine Weevil in conifers early next week

With increasing temperatures, it is plausible that a critical treatment window for controlling White Pine Weevil (WPW) will be present early next week, throughout many areas of NJ. Factors leading to this post include increased air temperatures and climbing growing degree-days (WPW adult movement and egg laying is around 7-58 growing degree-days (GDD50)), and most importantly rising soil temperatures as this pest typically begins movement with soils hovering around 50F. All of these factors lead to the possibility of WPW movement early next week and growers may wish to utilize a preventative, long lasting residual spray (pyrethroids) to target adults before they begin egg laying.

So we have: 

  • NJ will be within the GDD window for adult movement and approaching egg laying (7-58 GDD50)
  • Soil temperatures in some areas may be close to 50F.
  • Increased air temperatures and insect mobility
White Pine Weevil (Pissodes strobi)potential for emergence as of 3/6/2026 
Region Location CODE METRIC FRI SAT SUN MON TUES WEDS
6-Mar 7-Mar 8-Mar 9-Mar 10-Mar 11-Mar
Southern Upper Deerfield NJ50 GDD50 0 0 9 13 18 31
High Temp [ºF]  (Average) 49 (43.5) 52 (50.5) 63 (52) 67 (45) 71 (62) 71 (60.5)
24hr Average –       Soil TEMP [ºF] 47.1 <- (This will change over time / no prediction available)
Central Freehold / Howell NJ50 GDD50 0 0 4 6 9 17
High Temp [ºF]  (Average) 42(39) 49(48) 62(51.5) 69(56.5) 74(63) 70(59)
24hr Average –       Soil TEMP [ºF] 40.7 <- (This will change over time / no prediction available)
Northern HACKETTSTOWN G5633 GDD50 0 0 3 3 6 17
High Temp [ºF]  (Average) 41(37.5) 47(45.5) 61(49.5) 69(55) 76(63) 68(55)
24hr Average –       Soil TEMP [ºF] 34.1 <- (This will change over time / no prediction available)
USPEST.ORG – Model: simple average/growing degree-day, Min: 50F – Max: 95F, NMME forecast
Forecast:  7-month NMME based seasonal climate forecast (USPEST.ORG) – Subject to change regularly = Check Often
Air temperatures: Weather Underground (https://www.wunderground.com/) and NEWA: (https://newa.cornell.edu/)
Soil temperatures (10cm): https://www.greencastonline.com/tools/soil-temperature
Compiled by Waller. T. 3/6/2026 [twaller@njaes.rutgers.edu]

 

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ALERT – Potential for Ambrosia Beetle flight early next week – if you regularly have issues with this pest – take notice

The last few seasons we have seen an upswing in ambrosia beetle activity in nursery production, principally in field grown nursery stock of thin barked trees (commonly – dogwood, honey locust, magnolia, maple, redbud, zelkova, styrax, Prunus spp.). Based on evidence from multiple lines of trap collection data throughout the United States, adult female flights appear to be correlated to consecutive days (2-3) of 70F temperatures (highs) with daily average air temps around 65F (max+min/2). That is extremely close to what we will have throughout most areas of NJ early next week, based on 10-day weather forecasts. Note: this is historically very early for treatment of this pest and it will get colder the following days, however, we have missed control opportunities over multiple years so take treatment into consideration if you regularly encounter this pest.

Consider using pyrethroids in your production areas next Monday or Tuesday (weather dependent) if this pest has been a regular problem.

Contact insecticides: 

  • Pyrethroids [3A]: –thrins (bifenthrin, permethrin, etc.) – Pyrethroids longer lasting residual activity is why these materials are so effective against ambrosia beetles. 
  • Systemic insecticides DO NOT WORK

 

Potential for adult female ambrosia beetle flight 2026

Stay informed:

  • Sign up for the 2026 – Rutgers Ornamental IPM Program – click here to sign up
  • First webinar 4/14/26
  • Program is free, but registration is required – Registration includes:
    • Site visit to your ornamental nursery/farm from Rutgers agents
    • Delivered printed IPM resources (Guides, factsheets, bulletins)
    • Free pheromone & sticky trap kit + guidance on setup/monitoring (for commercial nursery/greenhouse and Christmas tree farms)
    • Access to live bi-weekly webinars (Zoom)
    • (First session TUESDAY 4/14 @ 12PM)
    • Every Second and Fourth, Tuesday, April through September

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