Design and Cost Considerations in the Sampling of Northern and Western Corn Rootworm (Coleoptera: Chrysomelidae) Eggs

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Cost and design considerations for egg sampling of the northern and western corn rootworm, Diabrotica barberi Smith & Lawrence (NCR) and D. virgifera virgifera LeConte (WCR), respectively, were examined by using sampling data collected in eight commercially grown cornfields. Considerable variability wasfound in horizontal and vertical distributions of NCR and WCR eggs. Therefore, sampling for NCR and WCR eggs should use a method that samples the entire inter-row width, and samples should be taken to a depth of at least 20 cm. Deeper sampling may be necessary when drought cracks allow females to oviposit more deeply. Sampling characteristics of the frame sampling method were examined. Indices of aggregation for the NCR and WCR did not differ significantly. The index of aggregation (1.49) calculated from pooled data (NCR + WCR) indicated aggregated egg populations. Sampling cost analyses show that the most efficient method to reduce sampling variability is to take one or two samples per frame from a large number of frames within a field. Sample size estimates for different sampling strategies are given.

Document Type: Research Article

Publication date: December 1, 1985

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