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WSU Decision Aid System

WSU Decision Aid System

Which Type of Apple Sunburn is in Your Orchard?

Wednesday June 06, 2018 12:00am
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).

Spider Mite Control During the Summer

Wednesday June 06, 2018 12:00am
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.

Preserving Biocontrol Agents

Tuesday June 05, 2018 12:33pm
Natural enemies (NE) are crucial to the long-term stability of management programs. Pesticides need to be chosen not only on the basis of efficacy against the pests, but also by minimizing their effect on natural enemies. DAS provides both the effects on pests and on the key natural enemies.

Use Pesticides Wisely to Avoid Resistance

Tuesday May 01, 2018 4:04pm
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.

Fireblight Prediction and Management

Tuesday May 01, 2018 2:49pm
Many consider blight an apparently random curse, and part of the game a pome fruit grower must play. As outbreaks do not occur yearly, damage always seems to be somebody else's problem, until it suddenly appears in your orchard.
Decision Aid System v. 6.8.0 (DAS) - Tree Fruit Research & Extension Center
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