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WSU Decision Aid System

WSU Decision Aid System

Improved SJS Model

Tuesday May 16, 2017 4:08pm
The San Jose scale model on DAS has been updated this year. This update is based on several years of crawler observations in various orchards. The model no longer requires a biofix linked to male flight after discovering that degree-day accumulations from....

Campylomma Bug

Tuesday May 16, 2017 4:05pm
Campylomma can be a pest during the bloom period when it feeds on young developing fruit. However, it is a beneficial predaceous insect that is valuable in control of soft bodied insects (such as spider mites) throughout the rest of year. DAS predicts the phenology of Campylomma during the spring, but beating tray samples need to be taken before and during the spring bloom period to determine if Campylomma is present and whether treatment is necessary.

Combining Leafroller and Codling Moth Control Tactics

Tuesday May 16, 2017 4:04pm
The period of time when overwintering leafroller (LR) larvae are most susceptible to the new insecticides overlaps with the beginning of the codling moth (CM) egg laying period. Some new insecticides will kill overwintering leafroller larvae as well as codling moth eggs that are laid on top of the insecticide residues.

Western Flower Thrips

Tuesday May 16, 2017 4:04pm
Western flower thrips feeding causes bloom distortion and poor fruit set. Egg-laying punctures create "pansy spot" on some cultivars. Adults can be sampled using either beating trays or blue sticky cards.

Bt Applications for Leafrollers

Tuesday May 16, 2017 4:04pm
Bacillus thuringiensis (Bt) is a bacterium that must be eaten by lepidopteran larvae (caterpillars) to be effective. Bt is a great material for leafroller control because it is specific and has little effect on natural enemies. However, it must be applied 2-3 times to be effective when leafroller populations are high. Experience has also shown that in the spring, the high temperatures need to be above 65°F for 3 or more days so that larvae have a chance to feed on it before sunlight breaks it down. DAS provides forecast temperatures for all stations in the "Weather Forecast" and in the "Show Data Grid" table so that you can decide whether or not to use Bt or other recommended chemicals.
Decision Aid System v. 6.3.33 (DAS) - Tree Fruit Research & Extension Center
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