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Tomato Fruitworm: Development of Sequential Sampling and Comparison with Conventional Sampling in Tomatoes

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Eggs of Heliothis zea (Boddie) were collected twice a week from leaves of the processing tomato plants from flowering to fruit harvest. The measure of dispersion k and several other indexes indicated that distribution of the fruitworm eggs per leaf or the cumulative number of eggs per 5 leaves from the upper third of a plant was highly clumped. A sequential sampling plan for the negative binomial distribution, using a common k of 0.093 and 0.005 and 0.02 egg per leaf as the lower and upper densities for the two decision lines, respectively. was constructed. The sequential sampling plan was compared with the conventional procedure in which an action threshold of 2 eggs per 100 leaves was used. Irrespective of whether insecticides were applied on a fixed basis without scouting, or by employing the two procedures, the fruitworm damage remained the same. However, both procedures reduced insecticide applications by ca. 70%. The sequential sampling plan was better than the conventional, because the former reduced the sampling time by 20%.

Document Type: Research Article

Publication date: June 1, 1982

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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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