Interactions of Leafhopper Population, Varietal Resistance, Insecticide Treatment, and Plant Growth on Dry Bean Yields in a Tropical Environment
Authors: Eskafi, Fred M.; Schoonhoven, Aart Van
Source: Journal of Economic Entomology, Volume 74, Number 1, February 1981 , pp. 7-12(6)
Publisher: Entomological Society of America
Abstract:Six varieties of beans, Phaseolus vulgaris L., planted in the dry and rainy seasons in a tropical middle-altitude of Colombia, varied in dry bean production within and between the seasons, with or without insecticides against Empoasca kraemeri Ross and Moore. Dry season yields were reduced by 96% for the susceptible variety and as much as 75% for the resistant one in the absence of insecticide in irrigated fields. Use of insecticides decreased the leafhopper population and increased plant growth and yield significantly.
Plant height in insecticide-treated and untreated plots was ca. twice in mid-growing cycle in the wet season as compared to the dry season. Dry to wet season ratio was 3:1 for adults and 5:1 for leafhopper nymphs in mid-growing season. Ratio of adult E. kraemeri to cm plant height in mid-growing cycle of the wet season was 0.17 on the susceptible variety but was 1.20 in the dry season. The means of the solar radiation and C° in the 2 seasons were ca. equal, but max C°, %RH, and mm rainfall were different.
It is suggested that in the dry season, leafhopper populations build up earlier on the susceptible variety, and the effect of high solar radiation on injured plant reduces plant productivity, while higher nitrogen content in the plant may be the reason for a higher E. kraemeri fecundity.
Document Type: Research Article
Publication date: February 1981
- 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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