Row Covers Effect on Sweetpotato Whitefly (Homoptera: Aleyrodidae) Densities, Incidence of Silverleaf, and Crop Yield in Zucchini
Authors: COSTA, HEATHER S.; JOHNSON, MARSHALL W.; ULLMAN, DIANE E.
Source: Journal of Economic Entomology, Volume 87, Number 6, December 1994 , pp. 1616-1621(6)
Publisher: Entomological Society of America
Abstract:The use of polyethylene row covers is an effective method to reduce whitefly, Bemisia tabaci Gennadius, and aphid, Aphis gossypii Glover, densities and the incidence of squash silverleaf in zucchini. Mean densities of whiteflies and aphids were significantly lower in row-cover treated plots than in untreated plots. Under conditions of low silverleaf incidence (<25% of plants with symptoms), row-cover treatments reduced the incidence of silverleaf, although no significant increase in yield per plant was found, and no relationship between silverleaf incidence and yield was found. Under high levels of silverleaf (>50% of plants with symptoms), there was a significantly higher total marketable yield per plant in row-cover treated plots than in pesticide-treated or untreated plots. In addition, increased yields were correlated with lower ratings of silverleaf severity and lower proportions of plants with silverleaf.
Document Type: Research Article
Publication date: December 1994
- 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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