Inherited Sterility Among Progeny of Cabbage Loopers Treated with Tretamine1

Treatment of male Trichoplusia ni (Hübner) (P1 generation) with tretamine caused partial to complete sterilization of the treated moths. Their progeny (F1 generation) exhibited various degrees of sterility which depended on the dose applied to the P1 male and the sex of the F1 moth. Sterility among F1 males did not exceed 80% and dropped to only 38% at the highest dose tested. The ratio of F1 male sterility to F1 female sterility was 2:1.