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WSU Decision Aid System

WSU Decision Aid System

Degree-Day Models

Tuesday May 16, 2017 4:04pm
Have you ever wondered why different pests have different degree-day sums? Here is why:

Canker Removal Now is Critical for Fire Blight Management this Year

Friday February 24, 2017 11:41am
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...

Delayed Dormant Sprays

Monday January 02, 2017 1:05am
Dormant sprays are important for management of a wide range of pests including European red mite, woolly apple aphid, rosy and green apple aphids, and San Jose Scale. Most of these are easily controlled using a variety of materials, but if you are using oils, remember that good coverage is essential because they work by covering the egg stage and preventing respiration.

How Does Codling Moth Mating Disruption Work?

Monday January 02, 2017 1:05am
Mating disruption dispensers work by releasing synthetic pheromone which prevents or delays males from finding females, thus reducing the reproductive rate of the population. Now is the time to decide which dispensers to place in the orchard so you have enough time for ordering and to organize your work force.

Which Leafroller Species is in Your Orchard?

Monday January 02, 2017 1:05am
There are two leafrollers commonly found in Washington orchards: Pandemis leafroller (PLR) and Obliquebanded leafroller (OBLR). The phenology of the two species is quite different and you need to be sure which species you have for proper management and use the correct model on DAS. PLR used to be more common, but in the past 10 years, OBLR has displaced PLR from many of the production areas.
Decision Aid System v. 6.3.33 (DAS) - Tree Fruit Research & Extension Center
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