This week on Scaffolds, I talk to Shianne Linsday, a graduate student in Dr Scott McArt’s lab, about our cool weather’s impact on pollinators, Kerik talks about getting through extended/multiple apple scab infection periods, and the lack of fire blight risk in a cold early bloom, and Anna gives us our state of the state update on trap captures and degree day accumulation around the state.
State of the State show notes
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 – 4/27
Station || Stage || DD 43F || DD 43 Forecast Through 5/3 ||
Geneva (AgriTech North) || Pink || 404 || 436
Highland (HVRL) || Full Bloom || 450 || 502
Clifton Park || Pink || 351 || 397
Peru (Forrence) || 1/2" Green || 220 || 267
Medina (Roberts) - Inland || Early Pink || 368 || 398
Appleton North - Lake || Early Pink || 255 || 279
Fairville (The Apple Shed) - Inland || Early Pink || 386 || 415
Williamson (DeMarree) - Lake || Early Pink || 322 || 342
*all DDs Baskerville-Emin, B.E
Upcoming Pest Events
Pest/Phenology Event || DD Base 43˚F || Approx. Date
STLM Traps set out || 1-Apr
Pear psylla – egg laying || 84 ± 44 || 33 ± 21 || 4-Apr ± 11 days
RBLR – 1st catch || 144 ± 32 || 60 ± 20 || 17-Apr ± 9 days
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
OFM Traps set out || Pink
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 || Bloom
Codling Moth Traps set out || Bloom
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
Regional Weather Events page for NEWA weather stations, including a map of freeze events from 2024 and 2025. https://newa.cornell.edu/regional-weather-events/
Cornell Statewide Frost Protection webinar held on Friday April 12th recording now available online here: https://youtu.be/TIBEpfb98ws
Scouting and Monitoring Resources
Video: Apple Insect Targets and IPM Practices (including explanations of Degree Day calculations), https://youtu.be/NwyBAcvbpUs
NY Tree Fruit Pest Monitoring Network Blog
https://blogs.cornell.edu/treefruitpests/
Interested in collaborating and contributing trap capture data? Contact Anna Wallis [email protected]
Quick Guide for Apple Insect Pests https://help.nysipm.org/hc/en-us/articles/23290226665751-NEWA-Quick-Guide-for-Apple-Insect-Pests
Virtual Orchard Scout Training webinar recording on the Cornell IPM YouTube channel
https://www.youtube.com/watch?v=OtyOWCL1Q2A
Apple IPM Intensive Workshop playlist https://www.youtube.com/playlist?list=PLoNb8lODb49vifrm9Tla4GmAVhlIL0527
Northeast Regional Climate Change Monthly Maps
https://www.nrcc.cornell.edu/regional/monthly/monthly.html
