Abstract
On Aug. 16, 1972, a granulosis virus was field-tested at 1 × 1011 capsules/acre against Plathypena scabra (F.) larval populations in a soybean field near Cambridge, Iowa. Bacillus thuringiensis Berliner and selected chemical insecticides were applied to small plots in a complete randomized-block design for comparison. No significant differences existed between the check and virus-treated plots for the first 4 days after application, whereas all plots treated with chemical insecticides R. thuringiensis were significantly different from the check. Larval numbers in virus-treated plots differed significantly from those of the check, beginning with the 6th day after treatment, with no significant differences between virus, B. thuringiensis , and 5 out of 6 chemical insecticide treatments on that date.
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