Cabbage Maggot Management Aided by Predictions of Adult Emergence12

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Abstract
A single, accurately-timed spray of fensulfothion or carbofuran, to coincide with Hylemya brassicae (Bouché) fly emergence for each generation, was as good as or better than soil treatments at planting or up to 21 regular weekly sprays. The best method to determine dates for timed sprays was on-site air temperature measurements to calculate thermal unit (TU) accumulations. Slightly less efficient predictive methods for adult emergence included adult trapping on sticky stakes, on-site soil TU, off-site air TU, and phenological observations. On-site air TU accumulations in conjunction with fly trapping is being used as a practical pest management practice in Wisconsin.