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Population Density of the Pecan Weevi11 Under 'Stuart' Pecan Trees2

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Two methods were used to estimate the population of adult Curculio caryae (Horn) emerging under 'Stuart' pecan trees. Weevils were trapped and collected by enclosing the area under the tree within the drip-line with a tent of cotton or nylon cloth. By this method the population per tree in 1969 was estimated at 3785 weevils. The second method used 100 screen wire traps arranged in 5 concentric circles 5.0 ft apart except for the innermost circle of 7.5 ft from the tree trunk. By this method tree populations were estimated at 1762 weevils in 1968 and 6130 in 1969. In addition to population-per-tree estimates, the trap method depicted the distribution of the population at 100 different points under the tree, thus reflecting the effects of positional factors. More adults emerged in the north and east quadrants than in the south and west, and emergence from the soil close to the trunk was above average.

Document Type: Research Article

Publication date: June 1, 1970

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  • 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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