Pear Psylla Degree Days (updated weekly on Monday)
This page shows the cumulative pear psylla degree-days (DD) calculated by DAS at selected weather station
locations across the Pacific North-West as part of the integrated pest management (IPM) program
recently developer by the
WSU Entomology Pear Extension and Research group
at WSU-TFREC in Wenatchee, WA. The map below shows the most recently calculated cumulative DD values
at each location.
The DAS calculated pear psylla degree-days, starting on the first week of February, will be available for
free to the public for the 2023 season.
Cashmere.N, WA | Hood River, OR | Medford, OR | Omak, WA | Peshastin.N, WA | Wapato.W, WA | Wenatchee, WA | |
---|---|---|---|---|---|---|---|
Jan 30 | 7 | 39 | 105 | 0 | 8 | 12 | 6 |
Feb 6 | 12 | 47 | 133 | 0 | 11 | 15 | 11 |
Feb 13 | 21 | 71 | 163 | 0 | 16 | 34 | 21 |
Feb 20 | 45 | 96 | 181 | 2 | 30 | 63 | 46 |
Feb 27 | 48 | 99 | 192 | 3 | 31 | 68 | 49 |
Mar 6 | 53 | 103 | 195 | 4 | 33 | 79 | 56 |
Mar 13 | 57 | 112 | 226 | 7 | 35 | 93 | 61 |
Mar 20 | 86 | 149 | 262 | 27 | 54 | 128 | 91 |
Learn more about the newly developed
pear psylla management guidelines and phenology model
at WSU Extension.
Subscribe to DAS to get daily degree-days values, including
estimated forecasts, for any weather locations across Washington, Oregon and Idaho, together with
timed management guidelines and spray recommendations throughout the season.