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Presence-Absence Sequential Sampling for Potato Tuber worm (Lepidoptera: Gelechiidae) on Processing Tomatoes: Selection of Sample Sites According to Predictable Seasonal Trends

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The potato tuber worm, Phthorimnea operculella (Zeller), is a major pest of processing tomatoes in Israel. Population densities of potato tuber worm are characterized by low densities before harvest of nearby potato fields. Infestation is first seen at field margins. In tomato fields not directly adjacent to potatoes, population density at the edges is higher than at the center. The goal of the current study was to develop a sampling plan based on the above observations. Spatial distribution was described using the Taylor power law. The relationship between mean population density and the proportion of infested sample units was established by the Wilson and Room equation. Two binomial sequential sampling procedures are suggested: before potato harvest in nearby fields and when population density is below the don't treat level, samples should be taken at the edge of the tomato field. After potato harvest and when population density is above the don't treat level, samples should be taken at the edge and the center of field. These sampling procedures reduce sampling cost when population density is low, and allow for treatment of potato tuber worm only at the edge of tomato fields when appropriate.

Document Type: Research Article

Publication date: October 1, 1995

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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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