Influence of Temperature and Humidity on Insecticidal Effect of Three Diatomaceous Earth Formulations Against Larger Grain Borer (Coleoptera: Bostrychidae)

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Laboratory experiments were carried out to evaluated three diatomaceous earth (DE) formulations—Protect-It, PyriSec (at dose rates 500, 1,000, and 1,500 ppm), and DEA-P (at dose rates 75, 150, and 500 ppm)—against the larger grain borer, Prostephanus truncatus (Horn) (Coleoptera: Bostrychidae), adults in stored maize, Zea mays L., at three temperatures (20, 25, and 30°C) and two relative humidity (RH) levels (55 and 75%). At these conditions, the capability of progeny production in the treated substrate also was assessed. Adult survival was high, at all doses of Protect-It and PyriSec. Progeny production was also high. In contrast with the other two DEs, DEA-P was highly effective and caused complete mortality to the exposed P. truncatus adults, even at the lowest dose rate (75 ppm). In addition, progeny production was completely suppressed. Generally, Protect-it and PyriSec were more effective at 20°C than at 30°C. In contrast, the efficacy of DEA-P was continuously high in all temperatures and relative humidities examined.

Keywords: Prostephanus truncatus; diatomaceous earth; mortality; progeny production; stored maize

Document Type: Research Article

Publication date: April 1, 2007

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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