OFM degree-days from biofix and optimal spray timing

Last year I tried a new approach to reporting degree-day (DD) accumulations from biofix for OFM and CM, and optimal insecticide timings based on reaching critical DD accumulations related to the percentage egg hatch for each generation of the target pest. This approach received favorable feedback, and I’m going to use it again this year by posting updates on Mondays and Thursdays, which you should receive on Tuesdays and Fridays. The graphs below provide this information for OFM management in peaches and apples (CM biofix not yet established for 2021). Note that the solid black line shows daily DD accumulations from OFM biofix (April 4), the colored dashed lines are optimal timings for different insecticides, and the black vertical dashed line indicates actual DD (to its left) and predicted DD (to its right), based on forecasted temperatures. All of this information is taken from Cornell University’s NEWA forecasting site at http://www.newa.cornell.edu/. When the solid black line crosses a dashed colored line, read down to the x-axis from the point of intersection to find the date of recommended timing for specific products.

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