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The Effectiveness of the Polyhedrosis Virus for Control of the Cabbage Looper, Trichoplusia ni1

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The polyhedrosis virus of the cabbage looper (Trichoplusia ni (Hübner) was applied to cabbage on a schedule to determine the effects of various dosages per acre and time interval between application upon larval control. High dosages of polyhedra (9.5 X1011 per acre) were more effective than low dosages (9.5XI09 per acre) but all rates caused significant larval mortality. Weekly applications were more effective than biweekly applications. The latter treatments did not give significant control until 39 days after the initiation of the scheduled sprays. An increase in percentage control of each succeeding larval in star was noted. The weekly applications of 9.5X 1011 polyhedra per acre averaged 0%,36%,66%,79%, and 85% control of the first, second, third, fourth and fifth instars, respectively.

Combinations of polyhedra with parathion and with toxaphene gave slight but significant increases in larval control over the materials used singly. Less worm damage was observed among plants treated with the polyhedra-parathion combination than with either one applied separately, but little difference occurred between the polyhedra-toxaphene combination treatment and toxaphene treatment.

Document Type: Research Article

Publication date: August 1, 1962

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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