Rutgers University | New Jersey Agricultural Experiment Station | Pesticide User Responsibility

April 4, 2023

HIGH potential for Boxwood Blight this Thursday 4/6

There is a potential for boxwood blight infections this WEDNESDAY and THURSDAY throughout much of NJ – especially central regions. Thursday’s high temperatures coupled with prolonged periods of leaf wetness overnight will contribute to the spread of boxwood blight infections.

If BWB is important to your business – Use the USPEST – PUSH Alerts – (click here) – to setup weekly email alerts. Create an account, watch the tutorial, and then set up your subscriptions. You select which locations (as many as you like), days you want to receive emails (pick Sunday/Monday), and what you would like to receive alerts about (BWB and a variety of other pests and diseases). Rutgers is not directly affiliated, however this is an incredible tool. 

  • It is time to begin protective fungicide applications in high value areas if you have not already done so! 

  • Protective fungicide applications should remain in effect or be initiated immediately for Boxwood Blight in “Infection risk or High Risk areas”. 
  • If your area is not listed (throughout all of NJ please visit the USPEST.ORG Boxwood Blight Risk Model – CLICK HERE TO CHECK YOUR LOCAL PREDICTIONS

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

Boxwood Blight Risk Assessment as of 4/4/2022
Region Location CODE 3-Apr 4-Apr 5-Apr 6-Apr 7-Apr 8-Apr
Southern Upper Deerfield NJ50 Very Low  Low  Minor Risk Very Low  Very Low  Very Low 
Central Howell / Freehold NJ10 Very Low  Low  Minor Risk Very High Very Low  Very Low 
Northern High Point NJ59 Very Low  Very Low  Low  High Risk Very Low  Very Low 
Monday Tuesday Wednesday Thursday Friday Saturday
 Please check YOUR LOCAL risk (click here)

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Filed Under: Landscape, Nursery, & Turf, Nursery, Turf Tagged With: , , , , , , , , , , ,
March 22, 2023

Immediate potential for Boxwood Blight 3/24 and 3/25 – First infection potentials

There is a potential for new boxwood blight infections this FRIDAY and SATURDAY throughout much of NJ – especially central regions. Increased temperatures and prolonged periods of leaf wetness will contribute to the spread of boxwood blight infections.

  • It is time to begin protective fungicide applications in high value areas if you have not already done so! 

  • Protective fungicide applications should remain in effect or be initiated immediately for Boxwood Blight in “Infection risk or High Risk areas”. 
  • If your area is not listed (throughout all of NJ please visit the USPEST.ORG Boxwood Blight Risk Model – CLICK HERE TO CHECK YOUR LOCAL PREDICTIONS

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

Boxwood Blight Risk Assessment as of 3/22/2023
Region Location CODE 22-Mar 23-Mar 24-Mar 25-Mar 26-Mar 27-Mar NOTES
Southern Upper Deerfield NJ50 Very Low  Low Low  Infection Risk Very Low  Very Low 
Central Howell / Freehold NJ10 Very Low  Low HIGH Risk HIGH Risk Very Low  Very Low  High prob. of first BWB infections
Northern High Point NJ59 Very Low  Very Low   Infection Risk Very Low Very Low  Very Low 
 Please check YOUR LOCAL risk (click here)

(input your area code – select closest weather station – check 7-14 prediction – click on graph / table)

These advisories are general in nature, change rapidly over time, are site-specific…therefore  Someone from your business should be using this risk model 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! Please contact Tim Waller if you need help using this service (twaller@njaes.rutgers.edu), we want to help! 

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

DISCLAIMER: The label is the law, always refer to it for allowable host crops, use-restrictions, application rates, reapplication intervals, re-entry intervals (REI), and mix compatibility information. Production and pesticide information on this site are for private/commercial pesticide applicators and landscape professionals only, and are NOT for home gardener use. Provided materials represent examples and do not cover all possible control scenarios. Trade-names listed do not imply endorsement and are used as examples only. Please contact your local agent or chemical sales representative for more information or to discuss additional pest management options.

Resources 

Background on the pathogen: 

Filed Under: Landscape, Nursery, & Turf, Nursery, Turf Tagged With: , , , , , , , , , , , ,
May 4, 2022

ALERT-Potential for new boxwood blight infections tomorrow in Southern NJ

There is a potential for new boxwood blight infections tomorrow in Southern NJ

  • Protective fungicide applications should remain in effect or be initiated immediately for Boxwood Blight in these areas
  • If your area is not listed (throughout all of NJ please visit the USPEST.ORG Boxwood Blight Risk Model – CLICK HERE TO CHECK YOUR LOCAL PREDICTIONS
  • BWB has been observed already this season just south of us in Maryland.

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

Boxwood Blight Risk Assessment as of 5/4/2022
Region Location CODE 4-May 5-May 6-May 7-May 8-May 9-May
Southern Upper Deerfield NJ50 Low  Low  Very Low  Low  Low  Very Low 
Southern Vineland NJ73 Low  Low  Very Low  Low  Low  Very Low 
Southern Millville KMIV Very Low Low  Very Low  Low  Low  Very Low 
Southern Bridgeton D4116 Low Infection Risk- Sus. vars. Very Low  Low  Low  Very Low 
Please check your local boxwood blight risk at ___ CLICK HERE TO CHECK YOUR LOCAL PREDICTIONS
  • These advisories are general in nature and change rapidly over time and throughout the state! Someone from your business should be using this risk model 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) 

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) 

  • [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

DISCLAIMER: The label is the law, always refer to it for allowable host crops, use-restrictions, application rates, reapplication intervals, re-entry intervals (REI), and mix compatibility information. Production and pesticide information on this site are for private/commercial pesticide applicators and landscape professionals only, and are NOT for home gardener use. Provided materials represent examples and do not cover all possible control scenarios. Trade-names listed do not imply endorsement and are used as examples only. Please contact your local agent or chemical sales representative for more information or to discuss additional pest management options.

Resources 

Background on the pathogen: 

Filed Under: Landscape, Nursery, & Turf, Nursery, Turf, Uncategorized Tagged With: , , , , , , , , ,
May 26, 2021

Immediate potential for boxwood blight in many parts of NJ over the next 4 days

Breaking- Due to the potential for rainfall and high humidity levels, there is an immediate risk of boxwood blight infections in many parts of New Jersey. Be mindful that even though we have had very little precipitation in the state as of late, we are well within the boxwood blight growth range and prior cover-sprays may have been washed off by irrigation or the interval to reapply has come due.

Preventative spray programs should continue or be initiated for high value crops or installations.  

Boxwood Blight Risk Assessment as of 5/26/2021
Region Location CODE 26-May 27-May 28-May 29-May 30-May 31-May
Southern Upper Deerfield NJ50 Infection Risk Infection Risk Very Low  Low  Very Low  Very Low 
Central Howell / Freehold NJ10 Low Infection Risk Very Low  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)

 

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) 

Fungicide options; 

  1. You very well may have these materials already applied as ‘cover-sprays’ – But – be mindful that protectant fungicides lose efficacy the more rain/irrigation they are subjected to, and reapplication may be warranted especially if the reapplication interval has come due.
  2. ROTATE between Fungicide Resistance Action Committee (FRAC codes) whenever possible

Format: [FRAC code]: Chemical name (Trade names)

  • [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)
DISCLAIMER: The label is the law, always refer to it for allowable host crops, use-restrictions, application rates, reapplication intervals, re-entry intervals (REI), and mix compatibility information. Production and pesticide information on this site are for private/commercial pesticide applicators and landscape professionals only, and are NOT for home gardener use. Provided materials represent examples and do not cover all possible control scenarios. Trade-names listed do not imply endorsement and are used as examples only. Please contact your local agent or chemical sales representative for more information or to discuss additional pest management options.
Filed Under: Landscape, Nursery, & Turf, Nursery, Turf Tagged With: , , , , , , , ,
May 4, 2021

Infection potential for Boxwood Blight in the next 48h – PROTECTANT fungicide applications should remain in effect

There is a potential for new boxwood blight infections today and tomorrow with the rain/humidity and higher temperatures

– Protective fungicide applications should remain in effect or be initiated immediately for Boxwood Blight (nursery and landscape settings) –

 

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

Boxwood Blight Risk Assessment as of 5/4/2021
Region Location CODE 3-May 4-May 5-May 6-May 7-May 8-May
Southern Upper Deerfield NJ50 Very Low  Infection Risk Infection Risk Very Low  Very Low  Very Low 
Central Howell / Freehold NJ10 Very Low  Low  Low  Very Low  Very Low  Very Low 
Northern High Point NJ59 Very Low  Very Low 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)

 

  • 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) 

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 they are subjected to, and reapplication may be warranted.
  2. ROTATE between Fungicide Resistance Action Committee (FRAC codes) whenever possible

Format: [FRAC code]: Chemical name (Trade names)

  • [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)

 

DISCLAIMER: The label is the law, always refer to it for allowable host crops, use-restrictions, application rates, reapplication intervals, re-entry intervals (REI), and mix compatibility information. Production and pesticide information on this site are for private/commercial pesticide applicators and landscape professionals only, and are NOT for home gardener use. Provided materials represent examples and do not cover all possible control scenarios. Trade-names listed do not imply endorsement and are used as examples only. Please contact your local agent or chemical sales representative for more information or to discuss additional pest management options.

Resources 

Filed Under: Landscape, Nursery, & Turf, Nursery, Turf Tagged With: , , , , ,
April 15, 2021

Nursery and Landscape Pest Scouting Guide: 150-250 Growing Degree-days and Boxwood Blight Risk ( currently = low risk )

Nursery and Landscape Pest Scouting Guide 150-250 GDD50:

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

Remember:

  • To determine your local growing degree-days, please review this post “Obtaining your local growing degree-day information”
  • The information provided in the downloads gives scouting GDD50 ranges (in growing degree days, base 50F) for specific insect pests harming nursery crop production and maintenance. It is important to note that these GDD50 are not exact, rather provide a range of GDD and subsequent calendar dates that can be used to scout for, and treat for, insect pests.
  • This document supports scouting, it does not replace it. Keeping good notes on pest development will help dial in scouting and treatment efforts at your local level.
  • Forecasting predictions (GDD50 accumulation) for calendar dates of multiple regions of New Jersey (S,N,C) are provided.
  • If you need more information, OR you are regularly seeing specific pest development stages at growing degree-days different than those listed here, please contact Tim Waller at twaller@njaes.rutgers.edu

GREAT RESOURCE from Steve Rettke: “Landscape Pest Notes: Some Early Spring Insects/Mites”

 

Projected GDD50 accumulation as of 4/15/2021
Region Location 4/15/21 1-Apr 1-May 1-Jun 1-Jul Aug. 1st
Southern Upper Deerfield (NJ50) 141 75 230 636 1314 2156
Central Howell / Freehold (NJ10) 94 67 165 513 1135 1929
Northern High Point (NJ59) 50 21 56 268 721 1327
Forecast: NOAA NCEP Coupled Forecast System model version 2 (CFSv2) forecast system (3.5 months) (USPEST.ORG)

 

Pest Scouting – Growing Degree-day Ranges (150-250 GDD50)
CROP TYPE Common Name Scientific Name GDD Min (50F) GDD Max (95F) Reference Developmental / Target Stage
Malus, Prunus, many Eastern tent caterpillar Malacosoma americanum 90 190 2 Larvae treatment before tents apparent (near 150-GDD50)
Elm, Service berry Woolly elm aphid Eriosoma americana 121 246 2 (6) Control target
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
Witchhazel, River birch Spiny witchhazel gall aphid Hamamelistes spinosus 171 – 6 Control target
Birch Birch leafminer Fenusa pusilla  190 290 RU Larvae (1st generation)
Conifer Spruce spider mite Oligonychus ununguis 190 363 RU Immatures/Adults
Honeylocust Honeylocust pod gall midge Dasineura gleditchiae 192 229 RU Larvae
Holly Holly leafminer Phytomyza ilicis 192 290 RU Egg hatch
Holly *Native holly leafminer Phytomyza ilicicola 192 298 2 Egg hatch
Rhododendron Rhododendron borer Synanthedon rhododendri 192 298 2 Typical treatment window
Larch Larch sawfly Pristophora erichsonii 192 299 2 Typical treatment window
Andromeda Andromeda lacebug Stephanitis takeyai 192 303 RU Adults
Rhododendron Rhododendron gall midge Clinodiplosis rhododendri 192 363 RU Larvae
Willows, Cottonwood, Poplar Imported willow leaf beetle Plagiodera versicolora 192 448 RU Larvae/Adults
Privet Privet thrips Dendrothrips ornatus 192 618 2 Typical treatment window
Lilac, ash, privet, many Lilac / Ash Borer Podosesia syringae 200 299 RU Adults – 1st Treatment
Spruce Spruce budworm Choristoneura fumiferana 200 300 5 Larvae
Elm Elm leafminer Fenusa ulmi 215 240 5 Adult emergence
Wild and cultivated roses Roseslug sawfly Endelomyia aethiops 230 – 6 Egg hatch / early instars
Deciduous, many Hawthorn lacebug Corythucha cydoniae 239 363 RU Nymphs/Adults
Conifer Arborvitae leafminer Argyresthia thuiella 245 360 RU Larvae Treatments
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)
References RU Rutgers Cooperative Extension – 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

 

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

Boxwood Blight Risk Assessment as of 4/15/2021
Region Location CODE 15-April 16-April 17- April 18-April 19-April
Southern Upper Deerfield NJ50 Low  Very Low  Very Low  Very Low  Very Low 
Central Howell / Freehold NJ10 Low  Very Low  Very Low  Very Low  Very Low 
Northern High Point NJ59 Very Low  Very Low  Very Low  Very Low  Very Low 
Please check your local boxwood blight risk at (https://uspest.org/risk/boxwood_app)

 

Considerations:

Become a Boxwood Blight Advocate to receive quarterly updates (through the Horticultural Research Institution)

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