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Fruits
Volume 58 Number 1 Date 05/02/2013 SPOTTED TENTIFORM LEAFMINER - The first of three flights expected this season began by April 26 in southern Wisconsin. Several cooperating apple orchards reported a few moths in the past week, but counts remain very low. Peak emergence of first brood adults could occur at advanced sites in the next two weeks if degree day accumulations surpass 150 (base 50°F). REDBANDED LEAFROLLER - Moths are appearing in pheromone traps across the south. Counts have been below 28 per trap and the first peak flight has not yet been noted. SPOTTED WING DROSOPHILA - A study to determine the overwintering status of spotted wing drosophila (SWD) began on April 1. Twenty fruit growers in 17 counties are participating in the UW-Madison-developed survey, which should determine if this newly introduced, invasive pest overwinters locally or migrates to the state from the southern U.S. Last August, SWD emerged in unprecedented numbers and the larvae caused extensive damage to blackberry and raspberry crops in all areas of the state. It remains unclear if this was an anomaly or if SWD will continue to threaten berries and other small fruits prior to harvest. The known distribution of SWD in the state includes the counties of Bayfield, Brown, Crawford, Dane, Door, Fond du Lac, Kewaunee, Manitowoc, Marinette, Monroe, Pierce, Racine, Vernon, Winnebago and Wood, for a total of 15 confirmed counties since it was first identified in Wisconsin in 2010. -- Krista Hamilton, DATCP Entomologist 
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