FEEDBACK

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.

Related Stories


Decision Aid System v. 6.3.34 (DAS) - Tree Fruit Research & Extension Center
1100 N Western Ave, Washington State University, Wenatchee WA 98801, 509-663-8181
Copyright © 2017 Board of Regents
Washington State University | Accessibility | Policies | Copyright