Effects of Tobacco Aphid (Homoptera: Aphididae) Populations on Flue-Cured Tobacco Production
Authors: REED, DAVID T.; SEMTNER, PAUL J.
Source: Journal of Economic Entomology, Volume 85, Number 5, October 1992 , pp. 1963-1971(9)
Publisher: Entomological Society of America
Abstract:Yield, price, and gross economic returns of /lue-cured tobacco, Nicotiana tabacum L., were described as a function of the seasonal abundance of tobacco aphids, MYZU8 nicotianae Blackman. Aphid populations were sampled and tobacco plants were harvested, cured, and graded on an individual plant basis. A wide range in aphid population pressure was obtained by selecting individual plants according to the time of aphid colonization. Pirimicarb, a selective aphicide, was applied to other plants to ensure that they would have less than naturally occurring aphid population levels. Yield, price, and gross economic returns responded as a nonlinear function of cumulative aphid-days. The per aphid effects on production variables decreased with increasing aphid population severity. Above a certain population level, additional losses became increasingly negligible. The type of response observed in this study with /lue-cured tobacco has been described as a desensitization response. In total, tobacco aphid populations reduced the yield up to 22 and 28% in 1988 and 1989, respectively. Reductions in the price of cured leaves were as great as 7 and 9% in corresponding years; the combined effects on both yield and price resulted in observed losses in gross economic returns of 27% in 1988 and 30% in 1989. Tobacco aphid populations develop most heavily on the actively growing leaves of the upper portion of tobacco plants, but the effect of aphids on production was most prevalent on leaves from other regions of the plant. The greatest effect was measured on the yield of leaves from the middle portion of the plant. However, cured leaves from the bottom of the plant had significantly greater reductions in price than leaves from elsewhere on the plant.
Document Type: Research Article
Publication date: October 1992
- 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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