22 April 2025

This week's topics: Season Long Woolly Apple Aphid Management, Apple Scab Projections, Blossom Blight Management, and our State of the State Update!

Historical Phenology and Average Degree Day Accumulation Base 43 (for reference)

Tight cluster (McIntosh) || 228 ± 27 || 27-Apr ± 7 days

Pink (McIntosh) || 289 ± 26 || 3-May ± 7 days

Full bloom (McIntosh) || 378 ± 35 || 10-May ± 6 days

Petal fall (McIntosh) || 479 ± 42 || 18-May ± 6 days

Phenology & DDs for NY NEWA Stations from 1/1 - 4/21

Station || Stage || DD 43F || DD 50F ||

Geneva (AgriTech North) || Pink || 219 || 90

Highland (HVRL) || Pink || 282 || 134

Clifton Park || 1/2" Green || 206 || 95

Peru (Forrence) || Green Tip || 164 || 99

Medina - Inland || Tight Cluster || 203 || 80

Appleton North - Lake || Tight Cluster || 168 || 79

Fairville (The Apple Shed) - Inland || Tight Cluster || 214 || 100

Williamson (DeMarree) - Lake || Tight Cluster || 201 || 95

*all DDs Baskerville-Emin, B.E

Upcoming Pest Events

Pest/Phenology Event || DD Base 43˚F || Approx. Date

Rosy apple aphid – 1st nymphs present || 189 ± 55 || 86 ± 30 || 25-Apr ± 7 days

STLM – 1st adult catch || 168 ± 48 || 73 ± 28 || 20-Apr ± 9 days

STLM – 1st egg observed || 208 ± 65 || 94 ± 36 || 27-Apr ± 5 days

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Tight cluster (McIntosh) || 228 ± 27 || 105 ± 19 || 27-Apr ± 7 days

Tarnished plant bug – 1st observed || 222 ± 105 || 105 ± 62 || 25-Apr ± 15 days

OBLR – 1st overwintered larvae observed || 236 ± 78 || 112 ± 48 || 29-Apr ± 7 days

Black stem borer – 1st adult catch || 283 ± 50 || 137 ± 40 || 6-May ± 3 days

European red mite – egg hatch observed || 284 ± 53 || 134 ± 34 || 6-May ± 4 days

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Pink (McIntosh) || 289 ± 26 || 139 ± 21 || 3-May ± 7 days

Oriental fruit moth – 1st adult catch || 229* ± 44* || 126 ± 33 || 2-May ± 8 days

RBLR – 1st flight peak || 303 ± 75 || 150 ± 48 || 4-May ± 9 days

STLM – 1st flight peak || 337 ± 71 || 168 ± 45 || 7-May ± 8 days

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Full bloom (McIntosh) || 378 ± 35 || 192 ± 25 || 10-May ± 6 days

"OBLR Overwintered Gen. Sample

Codling Moth Traps set out

*Base temperature for OFM 45F

Sprayer Calibration Videos

Jason Deveau, Sprayers101 https://sprayers101.com/articles/boom-sprayers/calibration/

Andrew Landers Part I https://www.youtube.com/watch?v=6izHj0GF1rY

Andrew Landers Part II https://www.youtube.com/watch?v=eAfEIjwg5HI

Weather

Northeast Regional Climate Change Monthly Maps

https://www.nrcc.cornell.edu/regional/monthly/monthly.html

NOAA Climate Prediction Center (forecasts and outlooks)

https://www.cpc.ncep.noaa.gov/products/forecasts/

NEWA and Pest Forecasting

NEWA Help Desk Frequently Asked Questions

https://help.nysipm.org/hc/en-us/categories/16994462926231-NEWA-Network-for-Environment-and-Weather-Applications

NEWA Help Desk Apple Insect, Disease, and Crop Management Forecasts

https://help.nysipm.org/hc/en-us/sections/17011505301783-Apple-Insect-Disease-and-Crop-Management-Forecasts

Quick Guide for Apple Insect Pests https://help.nysipm.org/hc/en-us/articles/23290226665751-NEWA-Quick-Guide-for-Apple-Insect-Pests

Apple IPM Intensive Workshop playlist: https://www.youtube.com/playlist?list=PLoNb8lODb49vifrm9Tla4GmAVhlIL0527

Apple Insect Targets and IPM Practices (including explanations of Degree Day calculations): https://youtu.be/NwyBAcvbpUs

NY Tree Fruit Pest Monitoring Network

https://blogs.cornell.edu/treefruitpests/

Interested in collaborating and contributing trap capture data? Contact Anna Wallis aew232@cornell.edu

Virtual Orchard Scout Training webinar recording on the New York State Integrated Pest Management Program (NYSIPM) YouTube channel.

https://www.youtube.com/watch?v=OtyOWCL1Q2A

Online Course, BF224: Tree Fruit Scouting.

https://smallfarmcourses.com/p/bf-224-tree-fruit-scouting

Cold Temperature and Frost Risk

Picture Table of Critical Spring Temperatures for Tree Fruit Bud Development Stages https://www.canr.msu.edu/resources/picture-table-critical-spring-temperatures-for-tree-fruit-bud-development-stages