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Looking Ahead
Volume 57 Number 10 Date 06/14/2012 VARIEGATED CUTWORM - Damage from this sporadic pest continues to be reported in many areas of the state. Larvae were found at the rate of 2-5 per 100 plants in two Marquette County corn fields and caterpillars have also been detected in alfalfa, potatoes and soybeans in Adams, Dane, Fond du Lac, Grant, Manitowoc, Rusk, Waupaca and Waushara counties. Economic thresholds are 2 larvae per square foot for alfalfa when regrowth is being impaired and 40% defoliation for soybeans. The larvae noted in Marquette County were 1½ inches long on June 11. WESTERN BEAN CUTWORM - The annual trapping survey is now in progress and the results obtained over the next eight weeks are expected to reveal peak emergence, potential problem areas and any significant changes in the state moth count. Two early moths were registered in the pheromone trap near Ripon from June 7-13. EUROPEAN CORN BORER - Larvae are primarily in the first and second instars and will begin entering the midribs of corn leaves in the week ahead. The treatment window for first generation corn borers remains open for 1-7 days in the south-central and southwestern counties and about two more weeks elsewhere. JAPANESE BEETLE - The first beetles of the 2012 season could emerge in the next 1-2 weeks. Damage to fruits, perennials, nursery stock and field crops should be anticipated later this month and throughout July. APPLE MAGGOT - Emergence of this fruit fly has begun in southwestern Wisconsin. A single specimen was captured on a yellow sticky trap at the Mineral Point orchard location. The University of Wisconsin recommends 1 fly per UNBAITED trap (per week) or 5 flies per BAITED trap as the threshold for determining the need for control. --Krista Hamilton, DATCP Entomologist 
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