Authors: ADLERZ, W. C.; BISTLINE, F. W.; RUSSO, L. W.; HOPKINS, D. L.

Source: Journal of Economic Entomology, Volume 82, Number 6, December 1989 , pp. 1733-1737(5)

Publisher: Entomological Society of America

Abstract:

Insect traps were used to monitor populations of sharpshooter leafhopper vectors, Oncometopia nigricans (Walker) and Homalodisca coagulate (Say), of Xylella fastidiosa Wells et aI., a xylem-limited bacterium, in four 11-ha plots of 'Valencia' oranges, Citrus sinensis (L.) Osb., and four 6-ha plots of 'Pineapple' oranges in a grove infected with citrus blight. When trap catches indicated that leafhopper populations were increasing, supplemental applications of insecticides were applied to half of the plots. One to three extra applications of insecticides per year were made to maintain significant differences in leafhopper populations between the routine care plots and the supplemental insecticide plots. Linear regression equations, with percentage citrus blight as a function of time in months, were fitted to the data for the supplemental insecticide and routine care plots. In the .Valencia, plots, the slope of the regression line for the routine care plot was significantly greater than the slope for the supplemental insecticide plots; therefore, the rate of spread of blight was reduced significantly where supplemental insecticide applications were made. In 'Pineapple' plots, the trend was similar but the difference in slope was not statistically significant.

Document Type: Research article

Publication date: 1989-12-01

More about this publication?

• 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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