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Vegetables
Volume 57 Number 17 Date 08/09/2012 COLORADO POTATO BEETLE - Emergence of second generation adults was delayed by as much as two weeks due to the extreme heat of late July, but has accelerated in the past week. Egg deposition is expected to be heavy at this time. Although feeding by summer potato beetles may result in severe defoliation and damage when potato tubers are bulking, controls targeting the resulting larvae are seldom required. CORN EARWORM - Locally heavy flights were registered in Dane, Fond du Lac and Jefferson counties from August 2-8. Larvae have been observed in silking corn fields as far north as Polk County, and treatments are under way. The action threshold for this late-season pest is based on the number of moths per trap per night, and a count of 5-10 moths in three consecutive nights indicates the need for protective treatment of susceptible fields. Counts this week were: Aztalan 115, Bloomington 0, Chippewa Falls 12, Columbus 19, Coon Valley 18, Janesville 8, Manitowoc 7, Marshfield 1, Oregon 24, Ripona 271, Riponb 503, Sun Prairie 56, Wausau 0 and Westport 93. JAPANESE BEETLE - Reports from Dane and Iowa counties indicate continuing problems in home gardens. The beetles are damaging basil, as well as the leaves of beans, eggplants and peppers. The simplest natural control is to remove them from plants and submerge them in a bucket of soapy water. Gardeners are also advised to cull and dispose of overripe and rotting produce, which can attract large numbers of beetles. --Clarissa Hammond, DATCP Pest Survey Program 
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