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Vegetables
Volume 59 Number 3 Date 05/15/2014 ONION MAGGOT - Flies of the first and most damaging generation will begin emerging next week in parts of southern Wisconsin. Simple cultural controls such as removal of onion cull piles and crop rotation have become even more critical now that the onion maggot has developed resistance to many of the insecticides used as granular furrow treatments at seeding. Proper sanitation is the best preventative measure. CABBAGE MAGGOT - Peak emergence of flies theoretically has occurred near Janesville, Lone Rock and Platteville following the accumulation of 300 degree days (base 43°F) as of May 14. Emergence should peak next week across the southeastern and central counties. Damage by this pest can be avoided by planting or transplanting cole crops two weeks from now, after most of the population has pupated. LATE BLIGHT - No cases have been confirmed in Wisconsin so far this season, but this disease could be especially severe under environmental conditions experienced this spring and given the presence of the late blight pathogen in the state in 2013. Potato and tomato growers should remain on alert and prepared to take appropriate measures to protect their crops. A reminder that Wisconsin Administrative Code (ATCP 21.15(2)) requires potato cull piles to be fed, disked in or otherwise removed by May 20, to prevent late blight from occurring on volunteer plants. -- Krista Hamilton, DATCP Entomologist 
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