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ONLINE IPM WEATHER DATA and DEGREE-DAYS
CURRENT CONDITIONS
5/26/98
Cool wet trend continues
Since May 8th, we have had unseasonably cool wet weather, which has had many impacts on insect crop and disease development. In fact, in Western Oregon, we have averaged only 2.5 to 3.0 degree-days per day (50F base; avg 7.0 for this period, last year 11.2 for this period). Compared to last year, we have had only one-quarter as many degree days for the last 18 days.
Overall, we are still 20-150 degree-days warmer than "Normal" (compare the deviations from normal map for May 24 vs May 7), but we lost the lead that had developed during the first part of March and May (see graph below).
With temperatures seldom reaching the lower '60's, insects and diseases that have a lower threshold of 50 are not developing much if any. These include the codling moth, obliquebanded leafroller, cabbage looper, black cutworm, spider mites, predator mites, and fireblight.
Catches in pheromone traps have been low. The moths which emerged in April and early May are still around, waiting for it to warm up. Once it does, traps should show very high numbers for a while.
Individual Pest Model Predictions (selected)
note: forecasts using actual 5-day forecasts plus historical normals
Western cherry fruit Fly - BIOFIX March 1
**** revised 5-28-98 ****
Willamette Valley - First emergence is predicted for June 1
The Dalles (warmest locations) - First emergence was predicted May 6, first eggs on fruit May 13, first hatch May 19, and peak egglaying predicted on May 31
Hood River (lower valley) - First emergence predicted on May 30
Codling moth
**** revised 5-28-98 ****
Medford - BIOFIX Apr 21; 3% egg hatch predicted June 4
Corvallis/Eugene - BIOFIX Apr 30; 3% egg hatch predicted June 13
Hood River (lower valley) - BIOFIX Apr 24; 3% egg hatch predicted on June 2
Obliquebanded leafroller
McMinnville - 5% moth catch in pheromone traps predicted June 10
Hood River - 5% moth catch in pheromone traps predicted June 10
Corvallis - 5% moth catch in pheromone traps predicted June 15
Orange tortrix
Corvallis - Peak egglaying predicted May 18; peak egg hatch is predicted June 7
Strawberry root weevil
Corvallis - Currently large larvae and pupae in soil; Peak adult emergence predicted June 21
Madras - Currently medium and large larvae in soil; Peak adult emergence predicted June 23
European pine shoot moth
McMinnville - First moth catch in pheromone traps predicted May 29
Corvallis - First moth catch in pheromone traps predicted May 31
Disclaimer: No claims are made as to the correctness or appropriateness of this information for your particular needs. No specific pest control products are intended for
endorsement or use. This responsibility rests solely with the people who interpret and implement information from this and other sources. Use all predictive information
with caution - errors occur, and predictive models do not replace the need for proper monitoring in the field. If you observe conditions that differ substantially from
model predictions, please contact us to determine if the model inputs were incorrect, if the model functioning or weather data are in error, or if the model is inappropriate
for your conditions.
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This project funded in part by a grant from the USDA-Western Regional IPM program.
On-line since April 5, 1996
Last updated May 28, 1998
Contact Len Coop at coopl@bcc.orst.edu if you
have any questions about this information.
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