May 24, 2022

Nursery Pests Scouting June – Bagworms, Scales, Borers, RHFB, BWB

Red-headed flea beetle – Adult emergence beginning any day now

Please refer to this timeline of pest development compiled by Tim Waller in communication with Brain Kunkel (Unv. Del) and Danny Lauderdale (NC State)

  • Contains material selection and timing, along with regime information and considerations

Boxwood Blight Alert – Infection Potential (Saturday) 5/27

Boxwood Blight Risk Assessment as of 5/24/2022
Region Location CODE 24-May 25-May 26-May 27-May 28-May 29-May
Southern Upper Deerfield NJ50 Very Low  Very Low  Low  High Risk Very Low  Very Low 
Central Howell / Freehold NJ10 Very Low  Very Low  Low  Infection Risk Very Low  Very Low 
Northern High Point NJ59 Very Low  Very Low  Very Low  Infection Risk Very Low  Low 
Check local boxwood blight risk here (CLICK HERE – input your area code – select closest weather station – check 7-14 prediction – click on graph / table)

 

Refer to the most recent Alert for more information – CLICK HERE

Pest Scouting – Please refer to these documents for a full listing of insects pests for your area corresponding to growing degree-days (GDDs). 

Contact if seeing insects at different times: twaller@njaes.rutgers.edu (or call the Cumberland County Extension Office – 856-451-2800)

The following key groups of pests will be active, vulnerable, or otherwise treatable during the next month throughout most of NJ. Here, bagworms, scale insects and borers with key life stage events during the 350-1500 GDD timeframe are discussed. Note there are many other insect pests present this time of year so please view the pest scouting guides above for your particular needs.

Projected GDD50 accumulation as of 5/24/2022 (USPEST) 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.
Region Location Station 24-May 1-Jun 1-Jul
South Upper Deerfield NJ50 488 638 1358
Central Howell / Freehold NJ10 426 551 1203
North High Point NJ59 288 387 909
Forecast: NOAA NCEP Coupled Forecast System model version 2 (CFSv2) forecast system (3.5 months) (USPEST.ORG)

Refer to this post “Obtaining your local growing degree-days” for additional information 

BAGWORMS (600-900 GDD) (Bagworm hatch prediction as of 5/24/22 – now until July 14 (Southern NJ (NJ50)))
Crop type Common Name Scientific Name GDD Min (50F) GDD Max (95F) Reference Developmental / Target Stage
Conifer mostly, many minor hosts Bagworm Thyridopteryx ephemeraeformis 600 900 RU Larvae (early instars) –

ONLY CONTROL WINDOW

Refer to this post for additional information on Bagworms

BORER Insect Activity for 350 – 1500 GDD (Now until ~July 1 in Southern NJ (NJ50))
Crop type Common Name Scientific Name GDD Min (50F) GDD Max (95F) Reference Developmental / Target Stage
Malus, Prunus, many Lesser peach tree borer Synanthedon pictipes 350 375 4 Adult flight, egg laying
Dogwood, apple, pecan, elm, hickory, willow Dogwood borer Synanthedon scitula 350 850 4 adults, eggs, caterpillars
Birch Bronze Birch Borer Agrilus anxius 440 880 RU Adults (egg laying)
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
Malus, Prunus, many Greater peach tree borer Synanthedon exitiosa 575 710 4 Adult emergence
Many Roundheaded appletree borer Saperda candida 802 1129 RU Adults
Ash Emerald ash borer Agrilus planipennis 1000 1200 4 Peak adult activity
Malus, Prunus, many Peachtree borer Synanthedon sp. 1500 1800 RU Larvae Treatment
Many Roundheaded apple tree borer Saperda candida 1514 1798 5 Typical treatment window
Conifer Nantucket tip moth Rhyacionia frustrana 1514 1917 RU Adults 2nd generation

Click here – “Identifying Clearwing Moth Borers in Pheromone Traps” or “Differentiating the Common Wood Borers of Ash Trees”

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May 13, 2022

Pest Scouting 200-500 GDD – Get sprayers ready for Borers, Scale Crawlers, and other important pests

It’s that time of year again, many scale crawlers and borers will be active over the next few weeks throughout NJ. Be prepared to target specific pest life-stages for the highest level of efficacy per material cost and get those problem insects in check. Application of contact insecticides during specific activity windows for these pests should be coupled with systemic applications now to help protect woody plants later on.

Borers attack stressed plants. If you recently dug then heeled-in trees, transplanted seedlings, or otherwise seriously stressed a tree, please consider taking immediate action to protect them from both adult flights (contact trunk sprays) and future infestations (systemics)   

Please Download these resources: (The scouting guide is for you to print and keep on hand…these are just updates)

Nursery and Landscape Pest Scouting Guide 2022 PDF (note this contains conifer pests as well)

Conifer Pest Scouting Guide 2022 PDF

Contact if seeing insects at different times: twaller@njaes.rutgers.edu (or call the Cumberland County Extension Office – 856-451-2800)

Projected GDD50 accumulation as of 5/13/2022 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.
Region Location Station 13-May 1-Jun 1-Jul
South Upper Deerfield NJ50 297 603 1323
Central Howell / Freehold NJ10 242 508 1160
North High Point NJ59 135 345 867
Forecast: NOAA NCEP Coupled Forecast System model version 2 (CFSv2) forecast system (3.5 months) (USPEST.ORG)

Refer to this post “Obtaining your local growing degree-days” for additional information 

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April 14, 2022

Nursery Pest Updates and Scouting next two weeks – initiate Red-headed flea beetle systemics now for Central and Southern NJ

This post covers three topics:

  1. Control and timing of applications for Red-headed flea beetle (RHFB) – Systemic materials should be used now to target emerging adults in May. 
    1. Please refer to this resource for timing and material selection: RHFB timeline using GDD, material selection, print-out ready (click here)
    2. Combination of resources from Danny Lauderdale (NC State), Brian Kunkel (UDel.), Tim Waller (RU)
  2. Seasonal reminders:
    1. Protectant, broad-spectrum ‘cover-sprays’ should be initiated ASAP or as plastic is removed / crops can be accessed
    2. SLF egg masses: We are all in this together should be remembered when it comes to checking loads for SLF.
      1. SLF EGG MASS GUIDE – USE FOR TRAINING (click here to download, hang up for employees)
      2. Refer to this post “Don’t let Spotted Lanternfly Impact Spring Shipping” for additional information 
  3. Pest Scouting for 100-200 Growing Degree-days (approx. next two weeks in Southern and Central NJ). 
    1. Refer to this post “Obtaining your local growing degree-days” for additional information 

Growing degree-days as  4/12/22 (~Next two weeks)

Projected GDD50 accumulation as of 4/13/2022 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.
Region Location Station 13-Apr 1-May 1-Jun
South Upper Deerfield NJ50 116 236 660
Central Howell / Freehold NJ10 114 200 553
North High Point NJ59 35 67 313
Forecast: NOAA NCEP Coupled Forecast System model version 2 (CFSv2) forecast system (3.5 months) (USPEST.ORG)

 

Crop type Common Name Scientific Name GDD Min (50F) GDD Max (95F) Reference Developmental / Target Stage
Conifer Pine engraver (Ips bark beetle) Ips spp. 100 150 4 1st adults active
Conifer Balsam twig aphid Mindarus abietinus 100 150 4 Stem mothers present (control target)
Conifer European pine sawfly Neodiprion sertifer 100 195 4 1st larvae active
Andromeda Andromeda lace bug Stephanitis takeyai 115 279 RU Nymphs (1st generation)
Azalea Azalea lace bug Stephanitis pyrioides 118 372 RU Nymphs (1st generation)
Conifer Larch casebearer Coleophora laricella 120 150 4 Egg hatch
Elm, Service berry Woolly elm aphid Eriosoma americana 121 246 2 (6) Control target
Birch Birch leafminer Fenusa pusilla 123 290 RU Adults – egg laying
Many Gypsy moth Lymantria dispar 145 200 4 Egg hatch, 1st larvae
Holly Holly leaf miner Phytomyza ilicis 147 265 RU Adults – egg laying
Many Cankerworms, inch-worms, loopers (many) 148 290 2 Larvae treatment
Yews, Rhododendrons, many Black Vine Weevil Otiorhynchus sulcatus 148 400 2 Pupation / Adult emergence
Lilac, ash, privet, many Lilac / Ash Borer Podosesia syringae 148 299 2 Adult flight
Dogwood, many Dogwood Borer Synanthedon scitula 148 700 2 Adult activity
Conifer Hemlock woolly adelgid Adelges tsugae 150 150 RU Eggs and 10% hatch
Conifer Spruce needleminer Endothenia albolineana 150 200 4 1st larvae active
Conifer Spruce spider mite Oligonychus ununguis 150 175 4 1st egg hatch
Conifer Balsam gall midge Paradiplosis tumifex 150 300 4 Adults laying eggs
Witchhazel, River birch Spiny witchhazel gall aphid Hamamelistes spinosus 171 – 6 Control target
Birch Birch Leafminer Fenusa pusilla 175 215 4 1st adults active
Birch Birch leafminer Fenusa pusilla 190 290 RU Larvae (1st generation)
Conifer Spruce spider mite Oligonychus ununguis 190 363 RU Immatures/Adults
Rhododendron Rhododendron gall midge Clinodiplosis rhododendri 192 363 RU Larvae
Honeylocust Honeylocust pod gall midge Dasineura gleditchiae 192 229 RU Larvae
Privet Privet thrips Dendrothrips ornatus 192 618 2 Typical treatment window
Holly *Native holly leafminer Phytomyza ilicicola 192 298 2 Egg hatch
Holly Holly leafminer Phytomyza ilicis 192 290 RU Egg hatch
Willows, Cottonwood, Poplar Imported willow leaf beetle Plagiodera versicolora 192 448 RU Larvae/Adults
Larch Larch sawfly Pristophora erichsonii 192 299 2 Typical treatment window
Andromeda Andromeda lacebug Stephanitis takeyai 192 303 RU Adults
Rhododendron Rhododendron borer Synanthedon rhododendri 192 298 2 Typical treatment window
Conifer Cooley spruce gall adelgid Adelges cooleyi 200 310 4 1st galls visible – Spruce
Spruce Spruce budworm Choristoneura fumiferana 200 300 5 Larvae
Conifer Douglas fir needle midge Contarinia pseudotsugae 200 400 3 Adults emerge from soil
Lilac, ash, privet, many Lilac / Ash Borer Podosesia syringae 200 299 RU Adults – 1st Treatment
References RU Rutgers Cooperative Extension – Landscape IPM Notes
Daily GDD50 =                                                                                                             (Max + Min temp.) / 2 – 50 (min temp. threshold)                             (Simple average growing degree-day, min. 50F, max 95F) 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)-evolving GDD ranges
Compiled by – Timothy J. Waller, Ph.D. – Rutgers Cooperative Extension, Cumberland County Nursery Crops – twaller@njaes.rutgers.edu

Please Download these resources: (The scouting guide is for you to print and keep on hand…these are just updates)

Nursery and Landscape Pest Scouting Guide 2022 PDF (note this contains conifer pests as well)

Conifer Pest Scouting Guide 2022 PDF

Contact if seeing insects at different times: twaller@njaes.rutgers.edu (or call the Cumberland County Extension Office – 856-451-2800)

Filed Under: Landscape, Nursery, & Turf, Nursery, Turf, Uncategorized Tagged With: , , , , , , , , , , ,
March 22, 2022

Pest Scouting Update – 25 to 150 GDDs Plus Printable resources!

Additional resource: SLF EGG MASS GUIDE – USE FOR TRAINING (click here to download)

We have compiled the GDD resources into one single document – please download and print multiple copies of this for yourself and employees in efforts to best scout for these insect pests. These guides do not dictate when to spray, rather they inform scouting ranges for insect pests, vulnerable life-stages, and overlapping timeframes for multiple troublesome pests.

Please Download these resources:

Nursery and Landscape Pest Scouting Guide 2022 PDF (note this contains conifer pests as well)

Conifer Pest Scouting Guide 2022 PDF

Refer to this post “Obtaining your local growing degree-days” for additional information 

We will be making regular announcements throughout the season, however we wanted you to have this beta-version of the compiled growing-degree day information. This will be updated and modified throughout the season – PLEASE let me know what difference you are seeing in the field so we can continue to make this resource better for all of us.   

Contact: twaller@njaes.rutgers.edu (or call the Cumberland County Extension Office – 856-451-2800)

Growing degree-days as of writing this 3/22/22 (using USPEST.org weather station codes):

  • Southern (NJ50): 74
  • Central (NJ10): 72
  • Northeastern (Greater NYC Metro area (D6302): 41
  • Northwestern (NJ59): 21
  • Crop type Common Name Scientific Name GDD Min (50F) GDD Max (95F) Reference Developmental / Target Stage
    Conifer Zimmerman pine moth Dioryctria zimmermani 25 100 3 1st larvae
    Conifer Cooley spruce gall adelgid Adelges cooleyi 25 120 3 Spring control of overwintering stage
    Conifer Eastern spruce gall adelgid Adelges abietis 25 100 3 Spring control of overwintering stage
    Conifer Northern pine weevil Pissodes approximatus 25 100 4 1st adults active
    Conifer Zimmerman pine moth Dioryctria zimmermani 25 100 3 1st larvae active
    Conifer Cooley spruce gall adelgid Adelges cooleyi 25 120 3 Spring control of overwintering stage
    Conifer White pine weevil Pissodes strobi 25 220 4 1st adults active
    Shade trees European fruit lecanium Parthenolecanium corni 35 145 2 Spring control of overwintering stage
    Many, evergreen Euonymus scale Unaspis euonymi 35 120 2 Spring control of overwintering stage
    Conifer European pine sawfly Neodiprion sertifer 35 145 1 Hatched larvae
    Conifer Fletcher scale Parthenolecanium fletcheri 35 148 2 Spring control of overwintering stage
    Conifer European pine shoot moth / borer Rhyacionia buoiana 50 220 4 1st larvae active
    Maples Maple bladdergall mite Vasates quadripedes 58 148 2 Spring control of overwintering stage
    Honeylocust Honeylocust plant bug Diaphnocoris chlorionis 58 246 2 Nympths / adults active
    Conifer Pine tortoise scale Toumeyela parvicornis 58 148 2 Cralwer activity
    Conifer Pine bark adelgid Pineus strobi 58 618 2 Spring control of overwintering stage
    Conifer Balsam twig aphid Mindarus abietinus 60 100 4 Egg hatch
    Many Southern red mite Oligonychus ilicis 69 157 RU Spring hatch
    Conifer Eastern pine shoot borer Eucosma gloriola 75 200 4 1st adults active
    Malus, Prunus, many Eastern tent caterpillar Malacosoma americanum 90 190 2 Larvae treatment before tents apparent
    Many Gypsy moth Lymantria dispar 90 448 RU Larvae treatment (early instars)
    Conifer Cooley spruce gall adelgid Adelges cooleyi 90 180 4 1st adults active – Douglas fir
    Malus, Prunus, many Eastern tent caterpillar Malacosoma americanum 90 190 2 Larvae treatment before tents apparent (near 150-GDD50)
    Malus, Prunus, many Eastern tent caterpillar Malacosoma americanum 90 190 2 Larvae treatment before tents apparent (near 150-GDD50)
    Conifer Balsam twig aphid Mindarus abietinus 100 150 4 Stem mothers present (control target)
    Conifer Pine engraver (Ips bark beetle) Ips spp. 100 150 4 1st adults active
    Conifer European pine sawfly Neodiprion sertifer 100 195 4 1st larvae active
    Pieris Andromeda lace bug Stephanitis takeyai 115 279 RU Nymphs (1st generation)
    Azalea Azalea lace bug Stephanitis pyrioides 118 372 RU Nymphs (1st generation)
    Conifer Larch casebearer Coleophora laricella 120 150 4 Egg hatch
    Elm, Service berry Woolly elm aphid Eriosoma americana 121 246 2 (6) Control target
    Elm, Service berry Woolly elm aphid Eriosoma americana 121 246 2 (6) Control target
    Birch Birch leafminer Fenusa pusilla 123 290 RU Adults – egg laying
    Many Gypsy moth Lymantria dispar 145 200 4 Egg hatch, 1st larvae
    Holly Holly leaf miner Phytomyza ilicis 147 265 RU Adults – egg laying
    Many Cankerworms, inch-worms, loopers (many) 148 290 2 Larvae treatment
    Lilac, ash, privet, many Lilac / Ash Borer Podosesia syringae 148 299 2 Adult flight
    Yews, Rhododendrons, many Black Vine Weevil Otiorhynchus sulcatus 148 400 2 Pupation / Adult emergence
    Dogwood, many Dogwood Borer Synanthedon scitula 148 700 2 Adult activity
    Conifer Spruce spider mite Oligonychus ununguis 150 175 4 1st egg hatch
    Conifer Spruce needleminer Endothenia albolineana 150 200 4 1st larvae active
    Conifer Balsam gall midge Paradiplosis tumifex 150 300 4 Adults laying eggs
    Conifer Hemlock woolly adelgid Adelges tsugae 150 150 RU Eggs and 10% hatch
    Conifer Spruce spider mite Oligonychus ununguis 150 175 4 1st egg hatch
    Conifer Spruce needleminer Endothenia albolineana 150 200 4 1st larvae active
    Conifer Balsam gall midge Paradiplosis tumifex 150 300 4 Adults laying eggs
    Conifer Hemlock woolly adelgid Adelges tsugae 150 150 RU Eggs and 10% hatch
    Conifer Spruce spider mite Oligonychus ununguis 150 175 4 1st egg hatch
    Conifer Spruce needleminer Endothenia albolineana 150 200 4 1st larvae active
    Conifer Balsam gall midge Paradiplosis tumifex 150 300 4 Adults laying eggs

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
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 by – Timothy J. Waller, Ph.D. – Rutgers Cooperative Extension, Cumberland County Nursery Crops – twaller@njaes.rutgers.edu

 

Filed Under: Landscape, Nursery, & Turf, Nursery, Plant Diagnostic Lab, Turf Tagged With: , , , , , , ,
February 18, 2022

Increasing temperatures = scout for insects pests! 2022 Nursery and Conifer Pest Scouting Guides HERE

With the increases in daily temperature averages expected over the next week for the southern and central areas of NJ, pest scouting should commence on commercially important ornamental crops and landscapes. Typically, in our region, growing degree-days (GDD50) are counted beginning March 1st (known as a biofix date), however this year by March first we may see degree-day accumulation approaching 20+. Therefor scouting efforts should be commenced, especially in conifers. 

We have compiled the GDD resources into one single document – please download and print multiple copies of this for yourself and employees in efforts to best scout for these insect pests. These guides do not dictate when to spray, rather they inform scouting ranges for insect pests, vulnerable life-stages, and overlapping timeframes for multiple troublesome pests.

Download here:

Nursery and Landscape Pest Scouting Guide 2022 PDF (note this contains conifer pests as well)

Conifer Pest Scouting Guide 2022 PDF

Refer to this post “Obtaining your local growing degree-days” for additional information 

We will be making regular announcements throughout the season, however we wanted you to have this beta-version of the compiled growing-degree day information. This will be updated and modified throughout the season – PLEASE let me know what difference you are seeing in the field so we can continue to make this resource better for all of us.   

Contact: twaller@njaes.rutgers.edu (or call the Cumberland County Extension Office – 856-451-2800)

Growing degree-days as of writing this (using USPEST.org weather station codes):

  • Southern (NJ50): 13
  • Central (NJ10): 13
  • Northeastern (Greater NYC Metro area (D6302) and Northwestern (NJ59): 0

Crop type

Common Name

Scientific Name

GDD Min (50F)

GDD Max (95F)

Reference

Developmental / Target Stage
Conifer
Conifer rust mites
Eriophyidae
7
22
4
Overwintering eggs hatch
Pomes, Stone fruit
European red mite
Panonychus ulmi
7
58
2
1st adults active
Conifer
White pine weevil
Pissodes strobi
7
58
RU
Overwintering adults become active / prevent egg laying
Deciduous
Oystershell scale
Lepidosaphes ulmi
7
91
2
Spring control of overwintering stage
Deciduous, Yew
Cottony camellia / taxus scale
Pulvinaria floccifera
7
91
5
Spring control of overwintering stage
Many
Southern red mite
Oligonychus ilicis
7
91
5
Overwintering eggs hatch
Conifer
Taxus mealybug
Dysmicoccus wistariae
7
91
2
Spring control of overwintering stage
Oaks
Kermes oak scales
Kermes spp.
7
91
2
Spring control of overwintering stage
Conifer
Elongate hemlock scale
Fiorinia externa
7
120
2
Spring control of overwintering stage
Many
Aphids
Aphidoidea
7
120
2
Spring control of overwintering stage
Conifer
Spruce spider mite
Oligonychus ununguis
7
121
RU
Overwintering eggs hatch
Oaks
Golden oak scale
Asterolecanium variolosum
7
121
5
Spring control of overwintering stage
Conifer
Pales weevil
Hylobius pales
7
121
RU
Overwintering adults become active / prevent egg laying
Magnoliaceae
Tuliptree scale
Toumeyella liriodendri
12
121
2
Spring control of overwintering stage
Rhododendron, Azalea
Azalea lacebug
Stephanitis pyrioides
18
372
RU
Spring control of overwintering stage
White and Scotch Pine
White pine aphid
Cinara strobi
22
91
RU
Spring control of overwintering stage
Conifer
Pine bark adelgid
Pineus strobi
22
58
2
Spring control of overwintering stage
Magnoliaceae
Magnolia scale
Neolecanium cornuparvum
22
91
2
Spring control of overwintering stage
Conifer
Spruce bud scale
Physokermes piceae
22
120
2
Spring control of overwintering stage
Conifer
Juniper scale
Carulaspis juniperi
22
148
2
Spring control of overwintering stage
Filed Under: Landscape, Nursery, & Turf, Nursery, Plant Diagnostic Lab, Turf Tagged With: , , , , , , , , , , ,
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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