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WSU Decision Aid System

WSU Decision Aid System

Delayed Dormant Sprays

Tuesday January 02, 2018 12:29am
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.

Which Leafroller Species is in Your Orchard?

Tuesday January 02, 2018 12:29am
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.

Delayed Dormant Sprays for Leafrollers

Tuesday January 02, 2018 12:29am
Pandemis leafroller (PLR) and oblique-banded leafroller (OBLR) have different phenologies which are well documented on DAS. Delayed dormant sprays can work well for PLR, but are generally too early in the season for efficacy against larvae of OBLR.

Canker Removal Now is Critical for Fire Blight Management this Year

Tuesday January 02, 2018 12:29am
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...

Woolly Apple Aphid

Tuesday January 02, 2018 12:29am
Woolly apple aphid (WAA) has become more common over the past few years and is a quarantine threat for export to certain countries. WAA can be found feeding on the roots as well as occurring in the tree canopy where it can appear as a white cottony mass on pruning scars or shoots.
Decision Aid System v. 6.8.0 (DAS) - Tree Fruit Research & Extension Center
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