Written by Liesl Oeller, Washington State University, April 23, 2024
Spring is here and many DAS models are starting. Codling moth (CM) flight is occurring along the corridor from Wenatchee to Yakima to the Tri Cities. CM flight in areas north of Wenatchee up to the British Columbia border is expected to begin next week. If CM flight is happening in your area, you can look at the DAS CM model to stay updated on the timing of egg presence and larval emergence. If you are using mating disruption, this should be in place by 120 degree days.
Due to the unseasonably warm weather we had a few weeks ago, so far in 2024 we have accumulated far more degree days than this time last year. In 2024, we are ahead of 2023 by an average of 128 degree days.
Degree Days 2023-2024
Comparing degree days between 2023 and 2024 for five different locations in Washington and Oregon.
| Location | 2023 DD | 2024 DD |
|---|---|---|
| Wenatchee | 72 | 211 |
| Moxee | 61 | 194 |
| Pasco | 137 | 290 |
| Hood River | 46 | 154 |
| Omak | 36 | 145 |
| Average | 70.4 | 198.8 |
Codling moth degree day accumulations. Darker blue circles indicate higher degree days.
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Contact
Liesl Oeller
Washington State University
elisabeth.oeller@wsu.edu
(509) 335-5815
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