Test of the GT powdery mildew risk model
All data tables include: Oregon - NWS, Agrimet and Hydromet Oregon, Oregon - RAWS network,
Medford Oregon - grower network, Hood River Oregon - grower network, Montana, Idaho, Washington, Wyoming, Alaska, and
BC & AB Canada
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This is an implementation of the UC Davis/Gubler-Thomas grape powdery mildew model. Beginning
in 2001, we began testing the online model in Hood River (Bob Spotts, MCAREC). The model
is used starting at bloom or when the first colony is found.
The model is based on the accumulation of risk index points during times of sufficient leaf wetness and temperature. The risk index has three classes: low (0-20), intermediate (30-50), and high (60-100). The fungicide spray schedule will depend upon the current risk class, as determined by weather data. The daily risk index (PMRI today) varies from -10 to +20. The cumulative risk index (PMRI cumulative) varies from 0 to 100, and is not allowed to fall below or above this range.
The primary reference for this model is: Contact your extension agent, or standby for this page to be updated for your local requirements. |
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This project funded in part by grants from the USDA-Western Regional IPM program and USDA areawide codling moth program.
On-line since April 5, 1996
Last updated Feb 4, 2002
Contact Len Coop at coopl@bcc.orst.edu if you
have any questions about this information.