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 January 1st accurately predict crawler emergence. Predictions for the second generation are far more accurate now.

The model predicts the activity period of the crawlers of the first and second generation. While the first-generation crawlers are the main target for pesticide interventions, rescue sprays can be applied for the second-generation crawlers, if SJS infestation is high.

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