FIELD TESTS WITH BACILLUS THURINGIENSIS BERLINER AND DDT FOR CONTROL OF TWO PESTS OF CABBAGE

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Abstract
At Kentville, Nova Scotia, during 1960, seven spray schedules including a commercial preparation of Bacillus thuringiensis Berliner and DDT were evaluated in the field for control of the imported cabbageworm, Pieris rapae (L.), and larvae of the diamondback moth, Plutella maculipennis (Curt.). Up to three spray treatments were applied at 2-week intervals. Three applications of B. thuringiensis or one application of DDT followed by two of B. thuringiensis gave good control of both insects. In general, DDT and B. thuringiensis were equally effective against imported cabbageworm but DDT was more effective against larvae of the diamondback moth.

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