Interactive Effects of Low-oxygen Atmospheres, Relative Humidity, and Temperature on Mortality of Two Stored-product Moths (Lepidoptera: Pyralidae)
Authors: Soderstrom, Edwin L.; Mackey, Bruce E.; Brandl, David G.
Source: Journal of Economic Entomology, Volume 79, Number 5, October 1986 , pp. 1303-1306(4)
Publisher: Entomological Society of America
Abstract:Interaction of oxygen concentration, temperature, and relative humidity with time required to kill Indianmeal moth, Plodia interpunctella (Hübner) and navel orangeworm, Amyelois transitella (Walker), was examined. Late larval and early pupal stages of navel orangeworm and pupae of Indianmeal moth were exposed to combinations of 0.5, 1, 2, or 5% O2. (with 10%CO2 and a balance of N2) at 15.6, 21.1, or 26.7°C and at 40 or 60% RH. These gas concentrations simulate the output atmosphere of a low-O2 generator fueled with methane or propane. Lethal time to kill 95% (LT95) of the population of each insect was determined by regression analysis for each combination of factors. A general equation was developed through multiple regression analysis of the LT95's for each insect species to describe the relationships. Temperature effects were similar for each species and could be made linear with a reciprocal transformation of the LT95 plotted against time. Effects of relative humidity and atmosphere on the LT95 were different for the two species. Indianmeal moths were affected more by changes in O2 concentration while navel orangeworms responded more to changes in relative humidity. Further analyses led to estimates of the low temperature threshold (i.e., temperature below which atmospheres would be ineffective) and to estimates of a constant, k, describing the time/temperature relationship. The time/temperature curve is described by a hyperbola and exposure time can be estimated accordingly.
Document Type: Research Article
Publication date: October 1, 1986
- 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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