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Fruits
Volume 58 Number 2 Date 05/09/2013 SPOTTED TENTIFORM LEAFMINER - Peak emergence of first brood moths is approaching in the southern and central counties. The apple orchards near Oneida in Brown County and New Berlin in Waukesha County reported high counts of 650-1,044 moths per trap in the past week. Counts elsewhere ranged from 1-490 per trap. The number of moths captured during the period defined as a "peak flight" varies by orchard, but is generally in the range of 800-1,200 per trap per week. GRAPE FLEA BEETLE - The spring migration of adults from hibernation sites to grapevines is in progress. Biweekly scouting is suggested beginning at the bud swell stage and continuing through late May. Feeding by the overwintered adults may damage primary buds at this time of year, preventing shoot expansion and ultimately reducing grape yields. Plants on the margins of vineyards are at greatest risk of injury. Treatment is justified if more than 4% of buds are damaged. REDBANDED LEAFROLLER - The first moths of the season were reported from April 25-May 1 as far north as Montello in Marquette County. Activity has accelerated in the last week, with counts ranging from 2-59 moths per trap. Peak flight activity, and corresponding high trap counts, should occur in southern and central orchards next week with the accumulation of 106-160 degree days (base 50°F). EASTERN TENT CATERPILLAR - Larvae have been active since April 26 and their tents should soon be noticeable on apple, ornamental crabapple and wild cherry trees. Removal of the small tents by hand or with a tool during the next two weeks will prove most effective in reducing defoliation. Burning the tent is hazardous and is not advised. -- Krista Hamilton, DATCP Entomologist 
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