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Vegetables
Volume 60 Number 2 Date 04/30/2015 SEEDCORN MAGGOT - Degree day accumulations near Beloit, Eau Claire, La Crosse and Madison have exceeded 360 (sine base 39°F) and are now appropriate for peak emergence (50%) of first generation flies. Untreated corn, soybean and vegetable seeds are at greatest risk of SCM damage during this period, especially where seed germination is delayed by low soil temperatures. COMMON ASPARAGUS BEETLE - Adult emergence and egg deposition on asparagus spears will begin during the first two weeks of May in southern and western locations where 150 degree days (simple base 50°F) are surpassed. This includes Beloit, La Crosse, Platteville and Spring Green. CABBAGE MAGGOT - Peak emergence of first generation flies can be anticipated in the next two weeks in advanced southern portions of the state. This event generally occurs at 300 degree days (simple base 43°F), as lilacs are in full bloom. Broccoli and cauliflower plantings on light sandy soils are at highest risk of maggot infestation and should be monitored closely later this month for signs of injury. Transplanting cole crops one week before or after peak fly emergence is recommended to avoid the primary damage period. -- Krista Hamilton, DATCP Entomologist 
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