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Sustained catch in St Lawrence County

4 female SWD were caught the week ending July 15, 2017 in two traps set near some wild raspberries growing outside a blueberry planting. This is sustained catch at this location. Paul Hetzler, extension educator, St Lawrence County CCE, is monitoring these traps as part of a berry research project.

Female SWD (left) and male SWD (right), viewed through a dissecting microscope after being drown in an apple cider vinegar trap. Note the serrated ovipositor on the female and the dark single spot on each wing of the male.

Although Paul expected to find more SWD this week, often SWD is slow to build up to large numbers, as has been the case this year.  Single digit numbers of total SWD caught in the 2-4 traps set at a location is common in the first two weeks of trapping, with double digit numbers occurring in the third and fourth weeks.

In prior years, blueberry plantings in Central New York haven’t had significant levels of infestation until early August, though this year this might occur by the end of July. Fruit can be monitored for infestation by sampling good quality fruit and screening it using a salt flotation assay.

More information on SWD Management is available on Cornell Fruit Resources SWD web pages.

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