Control of Heliothis spp. with a Nuclear Polyhedrosis Virus, EPN, and Two Newer Insecticides12

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Abstract
In 3 field tests conducted with insecticides and a nuclear polyhedrosis virus for control of the bollworm Heliothis zeja (Boddie) and the tobacco budworm H. virescens (F.), in the lower Rio Grande Valley in 1964, Shell SD-9129 (dimethyl phosphate ester with 3-hydroxy-N -methyl -cis-crotonamide) and Matacil (4-dimethylamino-m-tolyl methylcarbamate) most effectively controlled the insects and provided the highest increases in cotton yield. EPN (O-ethyl O-p-nitrophenyl phenylphosphonothioate) also showed promise. A nuclear polyhedrosis virus at 100, 500, and 1000 larval equivalents per acre, with 1 larval equivalent equaling 6 billion inclusion bodies, noticeably reduced the Hellothis spp. populations, but not so much as was desired.

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