7 April 2026 - Talking Woolly Apple Aphids with Dr. Robert Orpet, More Scab Predictions

This week on scaffolds, I talk to Dr. Robert Orpet of Oregon State University, one of the few people in the US who has worked extensively on woolly apple aphid but in Washington state, about woolly apple aphid, Kerik gives us more scab forecasting, and anna gives us the state of the state update with a review of scouting, degree day accumulations and reminders for the very quick start to the season happening in the Hudson Valley. Cox - Apple Scab Disease forecast predictions for New York as of 4-5-26 - Too cold for apple scab infections - refresh coverage as needed. State of the State Show NotesHistorical Phenology and Average Degree Day Accumulation Base 43 (for reference)-            Silver Tip (McIntosh) || 58-106-            Green Tip (McIntosh) || 99-144-            Half Inch Green (McIntosh) || 150-201-            Tight Cluster (McIntosh) || 206-257 Phenology & DDs for NY NEWA Stations from 1/1 – 4/6Station || Stage || DD 43F || DD 50F ||Geneva || green tip || 175 || 90Highland (HVRL) || 1/2" to early TC || 203 || 108Clifton Park || first green || 136 || 67Peru (Forrence) || silver tip || 84 || 34Medina (Roberts) - Inland || first green || 161 || 76Appleton North - Lake || first green || 118 || 55Fairville (The Apple Shed) - Inland || first green || 181 || 91Williamson (DeMarree) - Lake  || first green || 147 || 72*all DDs Baskerville-Emin, B.E Upcoming Pest EventsPest/Phenology Event || DD Base 43˚F || Approx. DateSTLM Traps set out   || 1-AprPear psylla – egg laying || 84 ± 44 || 33 ± 21 || 4-Apr ± 11 daysRBLR – 1st catch || 144 ± 32 || 60 ± 20 || 17-Apr ± 9 daysRosy apple aphid – 1st nymphs present || 189 ± 55 || 86 ± 30 || 25-Apr ± 7 daysSTLM – 1st adult catch || 168 ± 48 || 73 ± 28 || 20-Apr ± 9 daysSTLM – 1st egg observed || 208 ± 65 || 94 ± 36 || 27-Apr ± 5 days---Tight cluster (McIntosh) || 228 ± 27 || 105 ± 19 || 27-Apr ± 7 daysTarnished plant bug – 1st observed || 222 ± 105 || 105 ± 62 || 25-Apr ± 15 daysOBLR – 1st overwintered larvae observed || 236 ± 78 || 112 ± 48 || 29-Apr ± 7 daysBlack stem borer – 1st adult catch || 283 ± 50 || 137 ± 40 || 6-May ± 3 daysEuropean red mite – egg hatch observed || 284 ± 53 || 134 ± 34 || 6-May ± 4 days  Cold Temperature and Frost RiskPicture 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 on 4/25 and 26. 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/TIBEpfb98wsScouting and Monitoring ResourcesVideo: Apple Insect Targets and IPM Practices (including explanations of Degree Day calculations),  https://youtu.be/NwyBAcvbpUs  NY Tree Fruit Pest Monitoring Network Bloghttps://blogs.cornell.edu/treefruitpests/Interested in collaborating and contributing trap capture data? Contact Anna Wallis [email protected] Guide for Apple Insect Pests https://help.nysipm.org/hc/en-us/articles/23290226665751-NEWA-Quick-Guide-for-Apple-Insect-PestsVirtual Orchard Scout Training webinar recording on the Cornell IPM YouTube channelhttps://www.youtube.com/watch?v=OtyOWCL1Q2AApple IPM Intensive Workshop playlist https://www.youtube.com/playlist?list=PLoNb8lODb49vifrm9Tla4GmAVhlIL0527Northeast Regional Climate Change Monthly Mapshttps://www.nrcc.cornell.edu/regional/monthly/monthly.htmlNEWA Help Desk Frequently Asked Questions and Table of Contents. https://help.nysipm.org/hc/en-us/categories/16994462926231-NEWA-Network-for-Environment-and-Weather-Applicationshttps://help.nysipm.org/hc/en-us/sections/17011505301783-Apple-Insect-Disease-and-Crop-Management-Forecasts