Large-seale field experiments on the Eastern Shore of Virginia during 1960 indicated that a nuclear polyhedrosis virus could be artificially disseminated either alone or in insecticide sprays to eomll1ercially control the eabbage looper, Trichoplusia ni (HÜbner'). Weekly applications of virus in the insecticide sprays in commercial plantings maintained the looper populations at ab extremely low level throughout the growing season. Intensities of looper population resulting from natural virus infections on un- treated broccoli at Painter, Virginia, demonstrated a cyclic behavior that was not observed at college Park, the nuclear populations were. at College Park the nuclear polyhedrosis virus is believed to haw naturally occurred early in the season while looper populations were at a low level and the population remained low throughout the season, June through October. These observations indicate that frequency of treatment hy the virus for commercial control may vary in different areas.
Document Type: Research Article
Publication date: October 1, 1961
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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.