Cabbage Maggot Resistance to Aldrin in Ontario1

Publisher Website
Google Scholar
Abstract
Resistance to aldrin in the cabbage maggot, Hylemya brassicae, became apparent in 1963 in fields of rutabagas treated for maggot control with broadcast applications of aldrin. The problem was confined to areas where the broadcast treatment had been used most extensively. Adult flies from samples of pupae collected from these and other areas were sprayed with dilutions of 0.001%, 0.01%, 0.1% and 1.0% aldrin in a Potter spray tower. The results showed a high degree of resistance in areas reporting damage. Results from tests with flies from other areas where aldrin had been used for a variable number of years ranged from complete susceptibility to indications of a trend toward resistance. The author suggested the Potter tower screening technique as a tool for resistance surveys.