Sampling for the Sugarcane Borer (Lepidoptera: Pyralidae) in Sugarcane

Author: Hall, David G.

Source: Journal of Economic Entomology, Volume 79, Number 3, June 1986 , pp. 813-816(4)

Publisher: Entomological Society of America

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Abstract:

A sampling study was conducted in sugarcane to estimate infestation levels of the sugarcane borer (SCB), Diatraea saccharalis (F.). A single sample consisted of five stalks per plant from five plants spaced 3 m apart. A mean of 7 min was required for one scout to take one sample in cane 0.6–1.2 m tall; 16 min was required in cane 3.0–3.6 m tall. Variance to mean ratios, Green's coefficient of dispersion, and a simple linear regression of log10(s2)against log10(x_bar) showed that SCB populations usually were aggregated in sugarcane. Number of SCB larvae per sample followed the negative binomial distribution. In 0.4- to 0.8-ha areas of sugarcane, aggregation was not detected at low population densities but was pronounced at high densities. Estimated SCB infestation levels (mean number of borers per 25 stalks × 100) ranged from 0.4 to 48.0% in the different fields sampled. Based on 90% CL and a mean of nine samples per 0.4- to 0.8-ha area, accuracy of estimates for SCB infestation levels ranged from ±0.8 to ±26.6% with an overall average of ±7.4% based on simple variance or ±7.1% based on a regression estimate of variance. At infestation levels <10%, estimates of SCB infestation levels were generally within ±4.5% of the true levels based on simple variance or ±3.9% based on regressed variance. Accuracy of infestation level estimates generally decreased as SCB infestation levels increased.

Document Type: Research Article

Publication date: June 1, 1986

More about this publication?
  • 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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