Commercially produced samples of spore material of Bacillus thuringiensis Berliner were tested in sprays and dusts on cauliflower and cabbage plants for control of cruciferous insects. With coverage an important factor, dusts appeared to be better than sprays. No control of the beet armyworm, Laphygma exigua. (Hbn.), was obtained. For at least 80% kill of the cabbage looper, Trichoplusia ni (Hbn.), and of the imported cabbageworm. Pieris rapae (L.), a minimum dosage of 25X 1012 spores per acre was required. However, it is likely that higher dosage levels of up to 68X1012 spores per acre may be necessary for insect control in some situations. The materials were rather short lived on the plants and lost their effect after 5 to 10 days.
Document Type: Research Article
Publication date: October 1, 1959
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