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Fruits
Volume 57 Number 9 Date 06/07/2012 SPOTTED TENTIFORM LEAFMINER - The second of three flights this season has begun in southern and central Wisconsin, where trap counts ranged from 1-875 moths per trap from May 31-June 6. Peak flight activity can be expected around 1,150 degree days (base 50°F), or approximately June 17 near Beloit, June 22 near Madison, and June 28 at Eau Claire. The economic threshold increases from 0.1 to 1.0 mine per leaf for the second generation of sapfeeder larvae. CODLING MOTH - The spring flight accelerated in the northern counties and slowed in the south. At Niagara in Marinette County, the count increased from 42 moths per trap last week to 51 per trap this week. Economic numbers were also registered at the Chippewa Falls, Oneida and Spring Valley monitoring locations. Counts in southern orchards have generally declined to less than 8 per trap, with an average of 3 per trap. REDBANDED LEAFROLLER - Moth counts remained very low again this week, ranging from 0-16 per trap, with an average of 2.4 per trap. The second flight is likely to have begun at southern locations, although recent trap data indicate otherwise. The extremely low numbers of moths collected since mid-May suggests that populations are still primarily in the larval stages or that controls applied last month were very effective. POTATO LEAFHOPPER - Reports indicate that economic populations have developed in a few southern Wisconsin apple orchards. A count of just 1-2 adult or nymphs per leaf can cause foliage to curl and shrivel. The nymphs are most damaging to non-bearing trees, which should be scouted for evidence of this pest as long as warm, dry weather continues to favor leafhopper reproduction. Treatment is warranted at levels of one or more nymph per leaf when symptoms are obvious. --Krista Hamilton, DATCP Entomologist 
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