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Vegetables
Volume 60 Number 19 Date 08/27/2015 CORN EARWORM - Moth collections increased sharply for the first time this season. A surge of 535 moths per trap was registered in Green Lake County, and the weekly count near Ripon increased to 493 moths. Another 698 migrants were collected in the pheromone traps from Coon Valley to Mayville for a total of 1,726 moths this week. These counts are indicative of a very large and potentially destructive flight of corn earworm migrants capable of laying eggs in late-silking sweet corn well into September. Scouting and control programs for this pest should be maintained through harvest. Moth counts from August 20-26 were: Arlington 97, Coon Valley 12, Cottage Grove 43, Hancock 0, Janesville 9, Markesan 535, Marshfield 0, Mayville 302, Pardeeville 5, Ripon 493, Sun Prairie 104, Sun Prairie North 114, Sun Prairie West 12, and Wausau 0. LATE BLIGHT - This disease has been confirmed by the UW in La Crosse, Marathon and Walworth counties since the last report. Continued protective treatment of green vines with a late blight-specific fungicide on a five- to seven-day schedule is being recommended. Late blight can develop rapidly under cool, wet weather conditions, and entire plants may decline and die in as few as 7-10 days. Infected plant material can support sporulation for some time, leading to rapid spread of the disease. Infected plants must be killed or destroyed to prevent further spread. Cases of the disease have to date been identified in 12 counties: Adams (potato), Columbia (tomato), Fond du Lac (tomato), La Crosse (potato, tomato), Marathon (tomato), Marquette (potato), Polk (tomato), Portage (potato, tomato), St. Croix (tomato), Walworth (tomato), Waushara (potato, tomato) and Wood (potato, tomato). FALL ARMYWORM - Low counts of this late-season pest have been observed in a few cornfields in the past two weeks. Fall armyworm moths seldom appear in Wisconsin in damaging numbers and should not be mistaken for the corn earworm. Fall armyworm larvae have a lateral stripe, are usually light brown or black in color, and have a conspicuous white, inverted Y-shaped suture on the head capsule between the eyes, whereas the corn earworm larva may be green, yellow, pink or tan. -- Krista Hamilton, DATCP Entomologist .jpg)
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