Control of the Cabbage Looper with a Virus Disease1
Authors: McEWEN, F. L.; HERVEY, G. E. R.
Source: Journal of Economic Entomology, Volume 51, Number 5, October 1958 , pp. 626-631(6)
Publisher: Entomological Society of America
Abstract:Laboratory and field experiments showed that the virus which causes polyhedrosis of the cabbage looper (Trichoplusia ni (Hbn.)) is a highly virulent pathogen. In laboratory tests an oral dosage of 0.001 ml. of an inoculum prepared by triturating the body contents of one virus-killed fifth-instar cabbage looper in 16 liters of water caused infection and death of all larvae treated.
Field tests on cabbage, cauliflower and broccoli were conducted in which virus-killed cabbage loopers were triturated in water and applied at rates from 0.94 to 120 larvae per acre with a low- volume sprayer applying 30 gallons per acre. In all of the four field experiments it was possible to initiate a polyhedrosis epidemic and thereby greatly reduce the cabbage looper population in such test plots. Although increased dosage caused more rapid disease progress, a dosage of 0.94 larva per acre initiated a polyhedrosis epidemic. Six months storage of the inoculum at 0° F. did not cause any apparent reduction in pathogenicity nor was there any adverse effect noted when TEPP or spreader-sticker (Rohm & Haas B-1956) was added to the inoculum when applied.
Document Type: Research Article
Publication date: 1958-10-01
- 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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