Trapping Cabbage Maggots with Plant Bait and Allyl Isothiocyanate12

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Abstract
Allyl isothiocyanate was as effective as fresh cruciferous plants in trapping adult Hylemya brassicae (Bouché) for population studies. The synthetic bait caught as many males as females, suggesting that oviposition attraction is not the sole function of mustard oils to cabbage maggots. Four emergence peaks of flies were observed over the season of 1970 in Geneva, New York. Soil thermal units of 230 for first emergence and a mean of 1110 between peaks, as measured at a 2-inch depth under a growing row of vegetation, correlated closely with those accumulations previously established under controlled conditions.

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