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WSU Decision Aid System

WSU Decision Aid System

Spider Mite Control During the Summer

Thursday June 01, 2017 1:07am
There are currently lots of options to control spider mites in orchards. However, preventing outbreaks by avoiding pesticides toxic to predatory mites and their alternative prey is always first choice. If uncontrolled, spider mites can go through a single generation in 7-10 days during summer and increase their numbers exponentially. Monitoring helps to follow spider mite population growth and to intervene when necessary.

Which Type of Apple Sunburn is in Your Orchard?

Thursday June 01, 2017 1:07am
Sunburn browning is the most prevalent type of sunburn, and is caused by high fruit surface temperatures (FST) and ultraviolet radiation. The FST required to induce sunburn browning varies by cultivar, but is in the range of 113 to 120 °F (45 to 49 °C).

Use Pesticides Wisely to Avoid Resistance

Saturday May 27, 2017 12:04am
Repeated use of pesticides with the same mode-of-action used in the orchard can accelerate the development of insecticide resistance. WSU recommends that when you choose insecticides, keep track of which ones are being used so that you alternate materials with the different modes-of-action (shown in DAS) between generations.

Canker Removal Now is Critical for Fire Blight Management this Year

Wednesday May 24, 2017 1:17pm
No one wants fire blight in their orchard next year. For fire blight to take off in your orchard next year three things need to be there: the pathogen, the warm conditions and...

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....
Decision Aid System v. 6.3.35.1 (DAS) - Tree Fruit Research & Extension Center
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