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1 April 2007 Influence of Temperature and Humidity on Insecticidal Effect of Three Diatomaceous Earth Formulations Against Larger Grain Borer (Coleoptera: Bostrychidae)
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Abstract

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.

Christos G. Athanassiou, Nickolas G. Kavallieratos, Gerassimos G. Peteinatos, Stamatina E. Petrou, Maria C. Boukouvala, and Željko Tomanović "Influence of Temperature and Humidity on Insecticidal Effect of Three Diatomaceous Earth Formulations Against Larger Grain Borer (Coleoptera: Bostrychidae)," Journal of Economic Entomology 100(2), 599-603, (1 April 2007). https://doi.org/10.1603/0022-0493(2007)100[599:IOTAHO]2.0.CO;2
Received: 16 March 2006; Accepted: 11 November 2006; Published: 1 April 2007
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