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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....

Which Type of Apple Sunburn is in Your Orchard?

Monday May 23, 2016 1:30pm
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).

Bin Piles Are a Source of CM Off the Normal Model

Monday May 16, 2016 1:30pm
Bin piles placed in the orchard are often a source of codling moth. Larvae spin up in the bins in the fall and emerge when the bins are placed in the field. Because the bins in the center of a pile are insulated from temperature changes, adults emerge from bins at different times than predicted by the model.

Storage Scald of Apples

Monday May 16, 2016 1:30pm
The appearance of storage scald has been related to orchard temperature during the final weeks of fruit maturation. DAS provides accumulated hours below 50°F as well as orchard management recommendations for this postharvest disorder.

Degree-Day Models

Tuesday April 05, 2016 3:33pm
Have you ever wondered why different pests have different degree-day sums? Here is why:
Decision Aid System v. 6.3.35.2 (DAS) - Tree Fruit Research & Extension Center
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