Default Biofix Dates

Many pest forecast and crop management tools require a biofix date to start calculating the pest risk and crop results. NEWA tools utilize default biofix dates, estimated as described below, for users who are not tracking the specific biofix. For improved accuracy, always use your recorded biofix date for the crop or pest management tool you are interested in.

Click here to download a useful PDF record sheet for apple phenology and insect first trap catch dates.

Crop or IPM ToolBiofixesDefault Biofix Date
Apple Scab50% McIntosh green tipEstimate based on DD accumulations correlated with historical observations.
Fire BlightFirst blossom openEstimate based on DD accumulations correlated with historical observations.
Sooty Blotch and Flyspeck90% petal fallEstimate based on DD accumulations correlated with historical observations.
Apple MaggotFirst trap catchEstimate based on DD accumulations correlated with historical observations.
Codling MothFirst sustained trap catch; Second generation flight startEstimate based on DD accumulations correlated with historical observations.
Oriental Fruit MothFirst sustained trap catch; Second generation flight start; Third generation flight startEstimate based on DD accumulations correlated with historical observations.
Obliquebanded LeafrollerFirst sustained trap catchEstimate based on DD accumulations correlated with historical observations.
Plum Curculio90% petal fallEstimate based on DD accumulations correlated with historical observations.
San Jose ScaleFirst trap catch; Second generation emergenceEstimate based on DD accumulations correlated with historical observations.
Spotted Tentiform LeafminerFirst trap catch; Second generation flight startEstimate based on DD accumulations correlated with historical observations.
Apple Carbohydrate ThinningGreen tip; BloomEstimate based on DD accumulations correlated with historical observations.
Apple IrrigationGreen tipEstimate based on DD accumulations correlated with historical observations.
Grape Berry MothWild grape bloomEstimate based on DD accumulations correlated with historical observations.
Tomato DiseasesTransplant dateMay 15
Tomato DiseasesDate of potato cull sprouting or volunteer emergenceMay 1
Onion DiseasesPlanting dateApril 21
Potato DiseasesEmergence dateMay 10
Potato DiseasesDate of potato cull sprouting or volunteer emergenceMay 1

Page updated June 2020 by D. Olmstead, K. Eggleston and J. Carroll

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