April 27, 2023

Nursery Pest Update 4/25 – 5/5/2023

Please note: The Rutgers Nursery and Green Industry Working Group is working to deliver regular pest and disease updates throughout the season. These will be in addition to important alerts, critical topics, and pesticide credit opportunities. This tool is made for you, the commercial agriculture business, so please let us know if there are particular topics you would like to see included in the regular update.

Email:  twaller@njaes.rutgers.edu Phone: 856-451-2800 Ext. 1.

Insect Pests

Projected GDD50 accumulation as of 4/25/2023 (these change throughout the season!)
Region Location 25-Apr 1-May 1-Jun 1-Jul 1-Aug
Southern Upper Deerfield (NJ50) 251 281 682 1370 2218
Central Howell / Freehold (NJ10) 188 207 537 1160 1957
Northern High Point (NJ59) 142 143 371 864 1507
Forecast: 7-month NMME based seasonal climate forecast (USPEST.ORG)

Please download and print the Rutgers Nursery and Landscape Pest Scouting Guide  or  Conifer and Christmas Tree Pest Scouting Guide and refer to this post “Obtaining your local growing degree-days (GDD)” for additional information.  (See pest scouting guides for complete list of references) 

Please SHARE what you SEE!! If you see a pest, disease, otherwise interesting or troublesome issue please report it to the Working Group by following the QR Code on the front of the Pest Scouting Guides or by filling out this reporting form.

Please continue reading for much more detailed and important information!

[Read more…]

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February 4, 2022

Next Tuesday 2/8 – Nursery Sessions at the Atlantic City Agricultural Convention and Tradeshow

Please join us on Tuesday 2/8 – for a full day of nursery and ornamental educational sessions

NJ Agricultural Convention and Tradeshow – Nursery and Ornamental Sessions (Atlantic City – in-person) This upcoming Tuesday 

  • See here for a full list of speakers and here to register
  • Speaker highlight – If you have issues with Red-headed flea beetle you don’t want to miss our guest speaker Danny Lauderdale (NC State), he will be discussing control options for adults and larvae. We are EXTREMELY lucky to have this opportunity – Don’t miss this, he basically wrote the book on this pest. 
  • Pesticide credits requested

Nursery and Ornamental Tracks at the 2022 VGA

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January 24, 2022

Upcoming educational and credit opportunities – either Rutgers led or in cooperation with Rutgers RCE

Rutgers logos

 

There are numerous educational opportunities in the next few weeks that are either led directly by Rutgers RCE faculty or Rutgers faculty served on the association’s Educational Committee

Rutgers Led Programing:

1. This Saturday (1/29 – 12:00 – 1:30pm) – NJ Christmas Tree Growers Association – Annual Winter Meeting – Virtual – Open to anyone but you must register – click here  (Must upload IDs to a Rutgers Connect Secure Folder –  click here to upload Gov. ID and Pesticide license for this meeting only!) 

  • 12:00 – 12:45pm – Tim Waller and Bill Errickson – Detection and Management of Phytophthora in Christmas Trees – update from summer research
  • 12:45-1:30pm – George Hamilton – Pesticide Safety and Regulations Update
  • Pesticide credits (1x CORE, PP2, 3A, 10)

2. (2/8 – Morning and Afternoon Sessions) – NJ Agricultural Convention and Tradeshow – Nursery and Ornamental Sessions (Atlantic City – in-person)

  • See here for a full list of speakers  and here to register
  • Speaker highlight – If you have issues with Red-headed flea beetle you don’t want to miss our guest speaker Danny Lauderdale (NC State), he will be discussing control options for adults and larvae. We are EXTREMELY lucky to have this opportunity – Don’t miss this, he basically wrote the book on this pest. 
  • Pesticide credits available

Rutgers advisory to associations’ Educational Committee Events: 

1. (2/2 and 2/3) – NJ Nursery and Landscape Association – Total Pro Expo (in-person)

2. (2/23) – NJ Landscape Contractors Association – Landscape New Jersey (in-person)

 

We look forward to seeing everyone at these virtual or in-person events soon! Stay tuned for more programing as the seasons develops.

Rutgers is dedicated to protecting your privacy and keeping your personal information safe.  Upon upload, your files will be encrypted and stored to Rutgers Connect. Your information will be kept strictly confidential; used solely to meet NJDEP ID verification protocol for recertification credit; and will not be used for any other purpose. Your files will be deleted within 60 days after the training event.

 

 

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August 4, 2021

Nursery – Pest Scouting Guide for August – Reminders – Need a few more nurseries for Phytophthora sampling

NURSERY PEST SCOUTING GUIDE – August (1300-2200 GDD50)

Please download and print the pest scouting guide resource (printable version of the information below for your desk or truck) –(click on the link and then print): 

Projected GDD50 accumulation as of 8/4/2021
Region Location 1-Aug 1-Sep 1-Oct 1-Nov –
Southern Upper Deerfield (NJ50) 2145 2931 3477 3682 –
Central Howell / Freehold (NJ10) 1896 2630 3109 3249 –
Northern High Point (NJ59) 1490 2045 2352 2384 –
Forecast: NOAA NCEP Coupled Forecast System model version 2 (CFSv2) forecast system (3.5 months) (USPEST.ORG)

 

(Same material as downloads)

Pest Scouting – Growing Degree-day Ranges  (1600-3000 GDD50) 
CROP TYPE Common Name Scientific Name GDD Min (50F) GDD Max (95F) Reference Developmental / Target Stage
Many Redheaded flea beetle Systena frontalis 1570 1860 Udel. 2nd generation egg hatch
Many Two-banded Japanese weevil Pseudocneorhinus bifasciatus 1644 2271 RU Adults
Willow Willow twig aphids Lachnus spp. 1644 2271 5 Typical treatment window
Conifer Juniper webworm Dichomeris marginella 1645 1917 RU Larvae Treatment
Euonymus Euonymus Scale Unaspis euonymil 1700 – RU Prophylactic 2nd generation treatments
Conifer Cryptomeria scale Aspidiotus cryptomeriae 1750 2130 RU, 4 Crawlers emerge (2nd generation)
Many Obscure scale Melanaspis obscura 1774 – 6 Egg hatch / crawler
Oaks Oak skeletonizer Bucculatrix ainsliella 1798 2155 RU Larvae
Conifer Arborvitae leafminer Argyresthia thuiella 1800 2200 RU Larvae Treatment (3rd generation)
Mimosa, Honeylocust Mimosa webworm Homadaula anisocentra 1800 2100 RU Larvae (2nd generation)
Conifer Cooley spruce gall adelgid Adelges cooleyi 1850 1950 RU Galls open (Spruce)
Many Redheaded flea beetle Systena frontalis 1878 2318 Udel. 2nd generation Adults feeding
Turf Hairy chinch bug  Blissus leucopterus 1903 2160 RU Second generation- 50%- 2nd instars
Tulip Tuliptree aphid Illinoia liriodendri 1917 2033 RU Nymphs
Conifer Zimmerman pine moth Dioryctria zimmermani 1917 2154 5 Treatment window (adult flight-1700 GDD)
Mainly Oaks Orangestriped oakworm Anisota senatoria 1917 – 6 Egg hatch – early instars
Conifer White pine aphid Cinara strobi 1991 2271 RU Adults
Rhododendron Azalea whitefly Pealius azaleae 2032 2150 5 Adults/nymphs (3rd generation)
Maple Sugar maple borer Glycobius speciosus 2032 2375 5 Typical treatment window
Conifer Maskell scale lepidosaphes pallia 2035 – 6 Egg hatch / crawler (2nd generation)
Mainly Tulip Tulip tree scale Toumeyella liriodendri 2037 2629 RU Crawlers (1st generation)
Mainly Magnolia Magnolia scale Neolecanium cornuparvum 2155 2800 RU Crawlers (1st generation)
Euonymus Euonymus Scale Unaspis euonymil 2235 – 6 Egg hatch / crawler (2nd generation)
Locust Locust borer Magacyllene robiniae 2271 2805 5 Typical treatment window
Poplar and Willow Poplar and willow borer  Crytorhynchus lapathi 2271 2806 5 Typical treatment window
Conifer Spruce spider mite  Oligonychus ununguis 2375 2806 5 Typical treatment window – fall activity
Many Southern red mite Oligonychus ilicis 2500 2700 5 Typical treatment window
Maple Japanese maple scale Lopholeucaspis japonica 2508 – 6 Egg hatch / crawler (2nd generation)
Yew, many conifers Fletcher Scale (Yew) Parthenolecanium fletcheri 2515 2800 RU Fall control of overwintering stage
Conifer Elongate hemlock scale  Fiorinia externa 2515 2625 RU Typical treatment window – fall activity
Hardwoods Fall webworm Hyphantria cunea 2793 – 6 Egg hatch / crawler (2nd generation)
Conifer Cooley spruce gall adelgid Adelges cooleyi 2800 3000 3 Fall control of overwintering stage
Conifer Eastern spruce gall adelgid Adelges abietis 2800 3000 3 Fall control of overwintering stage
Note: Growing degree-day values utilize daily average air temperatures with a minimum temperature threshold (a.k.a. ‘base’) of 50F = GDD50 (max. temp. threshold set at 95F). These values are accumulated from a biofix date, such as January or March 1st in the NE USA. Provided GDD50 are scouting ranges and should be truthed. References RU Rutgers Cooperative Extension – Landscape IPM Notes
2 http://ccetompkins.org/resources/using-growing-degree-days-for-insect-management
3 https://extension.psu.edu/ipm-basics-for-christmas-trees#section-2
4 https://www.canr.msu.edu/ipm/agriculture/christmas_trees/gdd_of_conifer_insects
5 https://www.agriculture.nh.gov/publications-forms/documents/landscape-pests.pdf
Daily GDD50 =                                                                                                  (Max + Min temp.) / 2 – 50 (min temp. threshold) 6 https://extension.umd.edu/ipm/pest-predictive-calendar-landscapenursery
7 https://www.canr.msu.edu/ipm/agriculture/christmas_trees/gdd_of_landscape_insects
Unv. Del. Coorespondance with Dr. Kunkel (University of Delaware)-evolving GDD ranges
Compiled 8-04-2021 – Timothy J. Waller, Ph.D. – Rutgers Cooperative Extension, Cumberland County Nursery Crops – twaller@njaes.rutgers.edu

 

Redheaded flea beetle considerations:

Adults should be surfacing any day in the southern regions of the state. However, in two sentinel plot locations I have yet to see second generation adults as of 8/3/2021.

Contact materials aimed at managing developing larvae (especially growth regulators) may be particularly useful at this time. Contact materials or fast acting systemics should be used to target adults in the next few days to weeks. The use of long lasting systemics should also be considered to protect foliage from the next generations adults (if a third generation occurs) and again late season to guard from first generation adults in the 2022 spring season.

These GDD estimates and corresponding calendars are evolving as we continue to learn more about this pest. If you have high populations please contact Tim Waller so we can continue to adapt our recommendations in NJ.  Email: twaller@njaes.rutgers.edu

Please refer to this updated RHFB timeline printout for your desk or truck (as of 842021) (CLICK HERE)

 

SURVEY REQUESTS

WE NEED A FEW MORE FARMS!! Please answer a few questions if you would like to be included in a statewide Phytophthora in Conifer Nurseries sampling project 

Please fill out this brief survey if you are experiencing damages due to Redheaded flea beetle (RHFB)

Contact – Timothy J. Waller – twaller@njaes.rutgers.edu for more information

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May 25, 2021

Do you have Phytophthora at your conifer nursery / Christmas tree farm? We are still looking for a few more participants in a statewide study – aimed at better RECS.

Update: We are still looking for a few more participants in a state-wide Phytophthora sampling project. If you would like to participate please please respond via this brief survey (click here) 

Tim Waller (Cumberland Co.) and Bill Errickson (Monmouth Co.) of Rutgers Cooperative Extension are looking for 30 conifer producers to collaborate in a statewide Phytophthora sampling project, as part of a Specialty Crop Block Grant. This study will focus on identifying the species of Phytophthora limiting conifer production in New Jersey.

  • If your operation is selected, the agents will schedule one to three visits this growing season to collect samples from roots, bark, soil, irrigation systems, and will perform soil testing (Year 1).
  • During years 2 and 3, we will be performing chemical, biological, and cultural disease management trials in addition to conifer variety trials, at Rutgers-NJAES experiment stations. The aim is to generate local data – using local isolates in order to develop a more wholistic set of recommendations when targeting this disease in our NJ nurseries.

The agents also look forward to developing stronger relationships throughout New Jersey in the post-COVID19 era

This project is open to nurseries and Christmas tree farms producing conifers in NJ 

If you are interested in this project – please respond via this brief survey (click here) 

Please print and share this PDF survey with anyone not online (click here)

 

Please contact Tim Waller – twaller@njaes.rutgers.edu – (856-451-2800) – for more information

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May 5, 2021

Nursery and Conifer Pest Scouting Guide: 250-600 GDD & Boxwood Blight Information & Request for Collaborators

Please print or download these resources (click on them): 

General Nursery Scouting (contains conifer information within range) 

Conifer / Christmas Tree Specific Pest Scouting Guides

To determine your local growing degree-days, please review this post “Obtaining your local growing degree-day information”

Projected GDD50 accumulation as of 5/5/2021
Region Location 5-May 1-Jun 1-Jul 1-Aug 1-Sep
Southern Upper Deerfield (NJ50) 308 665 1342 2184 2970
Central Howell / Freehold (NJ10) 208 511 1132 1926 2660
Northern High Point (NJ59) 127 315 767 1373 1928
Forecast: NOAA NCEP Coupled Forecast System model version 2 (CFSv2) forecast system (3.5 months) (USPEST.ORG)

 

Pest Scouting – Growing Degree-day Ranges (240-600 GDD50)
CROP TYPE Common Name Scientific Name GDD Min (50F) GDD Max (95F) Reference Developmental / Target Stage
Many Redheaded flea beetle Systena frontalis 242 600 Unv. Del First control target – egg hatch / larval activity
Conifer Arborvitae leafminer Argyresthia thuiella 245 360 RU Larvae Treatments (1st generation)
Prunus American plum borer Euzophera semifuneralis 245 440 5 Adult flight, egg laying
Boxwood Boxwood mites Eurytetranychus buxi 245 600 RU All Stages
Lilac Lilac leafminer Caloptilia syringella 246 363 5 Larvae Treatments
Holly Holly leafminer Phytomyza ilicis 246 448 RU Larvae Treatment
Yew Taxus mealybug Dysmicoccus wistariae 246 618 RU Adults/Crawlers
Conifer Pine sawflies (Red-headed) Neodiprion lecontei 246 1388 RU Larvae (1st generation)
Boxwood Boxwood leafminer Monarthropalpusi flavus 249 – 6 Adult emergence
Conifer Eastern spruce gall adelgid Adelges abietis 250 310 5 Egg hatch, galls begin forming (not a control target)
Birch Birch Leafminer Fenusa pusilla 275 375 4 Adults laying eggs
Boxwood Boxwood Psyllid Cacopsylla busi 290 440 RU Nymphs
Conifer Pine Needle Scale Chionaspis pinifoliae 298 448 RU Crawlers (1st generation) – control target
Locust Locust leafminer Odontota dorsalis 298 533 5 Typical treatment window
Conifer Pine eriophyid mites Eriophyidae 298 533 5 Typical treatment window
Malus Redbanded leafroller Argyrotaenia velutinana 298 618 5 Typical treatment window
Privet Privet Rust Mites Aculus ligustri 298 802 RU All stages
Oaks Kermes oak scale Allokermes spp. 298 912 5 Typical treatment window
Conifer Pine root collar weevil Hylobius radicis 300 350 4 1st adults active
Conifer Turpentine beetle Dendroctonus terebrans 300 350 4 Parent beetles colonizing brood material
Spirea Spirea aphid Aphis spiraecola 326 – 6 Adults/nymphs
Conifer Hemlock Woolly Adelgid Adelges tsugae 350 350 RU Eggs and 50% hatch
Malus, Prunus, many Lesser peach tree borer Synanthedon pictipes 350 375 4 Adult flight, egg laying
Rhododendron Azalea Lacebug Stephanitis pyrioides 350 646 RU Adults (1st generation)
Dogwood, apple, pecan, elm, hickory, willow Dogwood borer Synanthedon scitula 350 850 4 adults, eggs, caterpillars
Conifer Elongate Hemlock Scale Fiorinia externa 360 700 RU Crawlers (1st generation)
Elm Elm Leaf Beetle Xanthogaleruca luteola 363 530 RU Larvae treatment (1st generation)
Conifer Larch casebearer Coleophora laricella 363 618 2,4 Nymphs active – typical treatment window
Many Oystershell Scale Lepidosaphes ulmi 363 707 RU Crawlers
Walnut Walnut blister mite Eriophyes erinea 363 707 5 Typical treatment window
Beech Woolly beech aphids Grylloprociphilus imbricator & Phyllaphis fagi 363 7070 5 Typical treatment window
Conifer Striped pine scale Toumeyella sp. 400 500 3 Crawlers (1st generation)
Conifer Pine needle midge  Thecodiplosis brachynteroides 400 500 7 Adults (1st generation)
Conifer Pine tortoise scale Toumeyella parvicornis 400 1000 4 Crawlers
Yews, Rhododendrons, many Black Vine Weevil Otiorhynchus sulcatus 400 2800 RU Adults treatment
Basswood Basswood lacebug Gargaphia tiliae 415 – 6 Adults/nymphs
MANY Fourlined plant bug Poecilocapsus lineatus 435 – 6 Egg hatch / early instars
Many Two-Spotted Mite Tetranychus urticae 437 997 RU Adults (build-up activity)
Birch Bronze Birch Borer Agrilus anxius 440 880 RU Adults (egg laying)
Boxwood Boxwood Leafminer Monarthropalpusi flavus 448 700 RU Larvae treatment
Rhododendron Azalea whitefly Pealius azaleae 448 700 5 Adults/nymphs
Oak Oak skeletonizer Bucculatrix ainsliella 448 707 5 Typical treatment window
Conifer Hemlock looper Lambdina fiscellaria 448 707 5 Typical treatment window
Conifer Pine shoot beetle Tomicus piniperda 450 500 4 Adults emerge; begin shoot feeding – control target
Conifer Pine Chafer (Anomela Beetle) Anomala oblivia 450 600 7 Adults (1st generation)
Many Gypsy moth Lymanttria dispar 450 900 4 Caterpillar to pupation – control target missed
Juniper Maskell scale Lepidosaphes pallida 470 – 6 Crawlers (1st generation)
Conifer European pine shoot moth Rhyacionia buoliana 480 710 5 Larvae Treatment
Malus, Prunus, many Peach Tree Borer Synanthedon sp. 500 600 RU Adults – emerge (1st treatment both types)
Rhododendron Rhododendron Borer Synanthedon rhododendri 509 696 RU Adults emerge
Many White prunicola scale Psedaulacaspis prunicola 513 – 6 Crawlers (1st generation)
Many Redheaded flea beetle Systena frontalis 517 1028 Unv. Del Adults – feeding / laying eggs
Many Cottony camellia / taxus scale Pulvinaria floccifera 520 – 6 Crawlers (1st generation)
Birch Birch Leafminer Fenusa pusilla 530 700 RU Larvae (2nd generation)
Conifer Arborvitae Leafminer Argyresthia thuiella 533 700 RU Adults (egg laying) – larvae treatments
Euonymus Euonymus Scale Unaspis euonymil 533 820 RU Crawlers (1st generation)
Oak Oak blotch leafminers Cameraria spp. ; Tisheria spp. 533 912 5 Typical treatment window
Maple Greenstriped mapleworm Dryocampa rubicunda 533 1645 5 Control target
Conifer Balsam gall midge Paradiplosis tumifex 550 700 4 Galls apparent
Conifer Juniper scale Carulaspis juniperi 550 700 7 Egg hatch
Malus, Prunus, many Greater peach tree borer Synanthedon exitiosa 575 710 4 Adult emergence
Conifer Cryptomeria scale Aspidiotus cryptomeriae 600 800 3 First crawler emergence
Conifer Bagworm Thyridopteryx ephemeraeformis 600 900 RU Larvae (early instars) – ONLY CONTROL WINDOW
Conifer Cooley spruce gall adelgid Adelges cooleyi 600 1000 7 Nymphs active – Douglas fir (control target)
RU Rutgers Cooperative Extension – Landscape IPM Notes
2 http://ccetompkins.org/resources/using-growing-degree-days-for-insect-management
3 https://extension.psu.edu/ipm-basics-for-christmas-trees#section-2
4 https://www.canr.msu.edu/ipm/agriculture/christmas_trees/gdd_of_conifer_insects
5 https://www.agriculture.nh.gov/publications-forms/documents/landscape-pests.pdf
6 https://extension.umd.edu/ipm/pest-predictive-calendar-landscapenursery
7 https://www.canr.msu.edu/ipm/agriculture/christmas_trees/gdd_of_landscape_insects
Unv. Del. Coorespondance with Dr. Kunkel (University of Delaware)

 

Boxwood Blight risk-model information, considerations, and links:

Boxwood Blight Risk Assessment as of 5/5/2021
Region Location CODE 4-May 5-May 6-May 7-May 8-May 9-May
Southern Upper Deerfield NJ50 Infection Risk Infection Risk Very Low  Very Low  Very Low  Very Low 
Central Howell / Freehold NJ10 Low  Low  Very Low  Very Low  Very Low  Very Low 
Northern High Point NJ59 Very Low  Very Low  Very Low  Very Low  Very Low  Very Low 
Please check your local boxwood blight risk here (click here and type in your area code – select closest station)

 

Wednesday 5/4/21 -PPA Post regarding boxwood blight activity (click here)

  • These advisories are general in nature and change rapidly so someone from your business should be using this risk model (CLICK HERE) daily if boxwood is important to your financial stability – In 30 seconds you can have a better idea of boxwood blight (and other pathogen) activity in your immediate area!
    • (click on the link – input area code – select closest weather station – check 7-14 prediction – click on graph / table) 

 

Phytophthora sampling and Redheaded Flea Beetle survey requests (5-minutes to take both)

Please answer a few questions if you would like to be included in a statewide Phytophthora in Conifer Nurseries sampling project 

Please fill out this brief survey if you are experiencing damages due to Redheaded flea beetle (RHFB)

Contact – Timothy J. Waller – twaller@njaes.rutgers.edu for more information

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