Within-Field Distribution Patterns and Fixed-Precision-Level Sampling Plans for Colorado Potato Beetle (Coleoptera: Chrysomelidae) in Tomatoes

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Abstract:

Taylor's power law and Iwao's patchiness regression were used to measure quantitatively the aggregation patterns of Colorado potato beetle (CPB), Leptinotarsa decemlineata (Say), egg masses, small larvae, large larvae, and adults in tomatoes grown under various CPB management practices. Taylor's method provided a better fit to the count data than did Iwao's regression. First and second instars exhibited the highest degree of aggregation, followed by third and fourth instars, adults, and egg masses, in decreasing magnitude of contagion. Spatial distribution patterns of CPB were not significantly affected by tillage treatment (conventional-till or no-till) or by insecticide applications. Fixed-precision-level sequential sampling plans, therefore, were developed for CPB third and fourth instars and for adults, based on Taylor's power law. An alternative technique to determine the minimum number of tomato plant samples necessary to estimate various larva and adult mean densities is discussed. Because of a greater tendency toward aggregation among third and fourth instars, more plant samples were required to estimate similar mean densities of large larvae than were needed for adults.

Document Type: Research Article

Publication date: April 1, 1988

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