Abstract
Base-line toxicity data obtained on a susceptible and homozygous cyclodiene-resistant strain of Hylemya Platura (Meigen) indicated that the pattern of resistance was similar to other species of root maggots in that there was a high degree of resistance to aldrin (727X) but no crossresistance to either diazinon (1.1X) or DDT (0.8X). With the exception of the F1 generation, results obtained in various crosses and backcrosses indicated that cyclodiene-resistance was monofactorial. However, the F1 population was not homogeneous; approximately 25% of the population was more resistant than predicted. It is suggested that the inheritance of cyclodiene-resistance in H. platura is due primarily to a single gene which is incompletely dominant, but that a modifying gene may be present at a very low level in either or both of the strains, which fact would make its presence known only in the hybrid individual.
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