29 April 2025

Dr. Bryan Danforth contact: bnd1@cornell.edu

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

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Phenology & DDs for NY NEWA Stations from 1/1 - 4/28

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

Geneva (AgriTech North) || Pink to bloom || 315 || 155

Highland (HVRL) || Bloom || 416 || 215

Clifton Park || Pink || 304 || 154

Peru (Forrence) || Tight Cluster || 234 || 107

Medina - Inland || Pink || 283 || 141

Appleton North - Lake || Pink || 227 || 105

Fairville (The Apple Shed) - Inland || Pink || 299 || 148

Williamson (DeMarree) - Lake || Pink || 268 || 126

*all DDs Baskerville-Emin, B.E

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Upcoming Pest Events

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

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

Lesser appleworm – 1st catch || 420 ± 144 || 217 ± 88 || 13-May ± 12 days

American plum borer – 1st catch || 457 ± 64 || 240 ± 45 || 16-May ± 7 days

OFM – 1st flight peak || 369* ± 91* || 223 ± 57 || 15-May ± 11 days

Codling moth – 1st adult catch || 475 ± 85 || 249 ± 55 || 18-May ± 7 days

San Jose scale – 1st adult catch || 533 ± 88 || 284 ± 61 || 21-May ± 8 days

Cherry fruit fly traps set out || 20-May

STLM – 1st sap-feeding mines observed || 472 ± 129 || 241 ± 76 || 18-May ± 13 days

Petal fall (McIntosh) || 479 ± 42 || 252 ± 32 || 18-May ± 6 days

*Base temperature for OFM 45F

Weather

NRCC State Maps

Climate Prediction Center - Forecasts & Outlook Maps, Graphs and tables

NEWA and Pest Forecasting

NEWA Help Desk Frequently Asked Questions

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

Quick Guide for Apple Insect Pests

Apple IPM Intensive Workshop playlist:

Apple Insect Targets and IPM Practices

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 IPM Scout Training

BF 224: Tree Fruit Scouting | Cornell Small Farms Program

Cold Temperature and Frost Risk

Picture Table of Critical Spring Temperatures for Tree Fruit Bud Development Stages

Regional Weather Events page for NEWA weather stations

Cornell Statewide Frost Protection webinar

Pre-emergent Herbicides

Spring Orchard Pre-Emergent Herbicides – CCE Eastern NY Commercial Horticulture Program