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WSU Decision Aid System

WSU Decision Aid System

Ways to Reduce Drift

Monday January 02, 2017 1:05am
Spray drift is one of the most important issues facing pesticide applicators. Movement to off-site locations can be caused by wind, poor calibration/adjustment, and operator error.

Woolly Apple Aphid

Monday January 02, 2017 1:05am
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.

Fireblight Prediction and Management

Monday January 02, 2017 1:05am
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.

Factors Affecting Bee Pollination of Tree Fruits

Monday January 02, 2017 1:05am
Nearly 1,000 species of bees occur in the Pacific Northwest, but only a small number of species are useful in the pollination of orchard crops. Pesticide use and loss of appropriate nesting habitat have reduced the numbers of wild bee pollinators, leaving most of the pollination for commercial orchards dependent on honeybees. The success of honeybee pollination in tree fruits is affected by a number of factors, which in part can be manipulated by orchardists and beekeepers.

Apply Mating Disruption Dispensers Before First Moths Fly

Monday January 02, 2017 1:05am
Mating disruption dispensers work by releasing synthetic pheromone which prevents or delays males from finding and mating with females. Therefore, dispensers need to be placed in your orchard before the first moths fly and mate. First moth flight (= biofix) occurs at around 175 DD. We recommend to place pheromone traps before first apple blossoms open or by 100 DD whichever comes first.
Decision Aid System v. 6.3.29 (DAS) - Tree Fruit Research & Extension Center
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