Timing Applications of Plant Growth Regulators and Last Irrigation for Pink Bollworm (Lepidoptera: Gelechiidae) Control
Authors: BARIOLA, L. A.; CHU, C. C.; HENNEBERRY, T. J.
Source: Journal of Economic Entomology, Volume 83, Number 3, June 1990 , pp. 1074-1079(6)
Publisher: Entomological Society of America
Abstract:After ethephon and thidiazuron were applied in late season to small plots of Upland cotton (Gossypium hirsutum L.) to terminate fruiting chemically, the numbers of green bolls and pink bollworm, Pectinophora gossypiella (Saunders), diapausing larval populations, and yields were determined. Tests were conducted during 1985 and 1986 on the Maricopa Agricultural Center, Maricopa, Ariz., and on the Irrigated Desert Research Station, Brawley, Calif. Also, at Brawley in both years, we determined the combined effects of early irrigation cut-off and chemical termination. Results show that rates of 1.12 kg (AI)/ha of ethephon or higher and rates of 0.056 or 0.112 kg (AI)/ha of thidiazuron were needed for effective termination of cotton fruiting as indicated by reductions in number of green bolls. These rates of each chemical also reduced the number of squares and blooms after treatment, and sequential applications resulted in greater reductions than a single application. Last irrigation in mid-July resulted in reduced yields. However, irrigation cut-off in late July or early August resulted in yields as high as when the last irrigation was in September. Yields were not reduced by chemical termination treatments except by thidiazuron at Brawley in 1986, when last irrigation was in mid-July. Diapausing pink bollworm larval populations were reduced by chemical termination treatments and early irrigation termination.
Document Type: Research article
Publication date: 1990-06-01
- 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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