Controlled Atmospheres for the Postharvest Disinfestation of Thrips obscuratus (Thysanoptera: Thripidae)
Authors: POTTER, MURRAY A.; CARPENTER, ALAN; STOCKER, ADRIENNE; WRIGHT, SANDY
Source: Journal of Economic Entomology, Volume 87, Number 5, October 1994 , pp. 1251-1255(5)
Publisher: Entomological Society of America
Abstract:New Zealand Thrips obscuratus (Crawford) adults were exposed to combinations of temperature (O, 7, 13, or 2O°C), gas (air, or 0, 9, or 18% carbon dioxide [CO2] in 2% oxygen [O2], with the balance nitrogen [N2]), and exposure time (2, 4, 6, or 8 d). Mortality varied directly with temperature, gas, and time. Two-way interactions between temperature and gas, temperature and time, and gas and time were significant. The mortality of T. obscuratus held in the 0%-CO2 atmosphere did not differ significantly from the mortality of those held in air at O, 7, or 13°C. At 20°C, T. obscuratus mortality was greater in the 0%-CO2 atmosphere than in air. Mortality was at a minimum in both of these gases at 13°C. Multiple linear-regression analysis of the data excluding the air controls revealed significant three-way interactions between temperature, CO2 concentration, and time; this method was used to generate three-dimensional mortality response surfaces that predict a range of controlled-atmosphere treatments insecticidally effective against T. obscuratus. With CO2 concentrations ≤9%, T. obscuratus mortality tended to decrease as temperature increased from 0°C to≍ 13°C and then increase as the temperature approached 20°C. The mortality response was the reverse of this in atmospheres >9% CO2; in these atmospheres, mortality reached a maximum between 13 and 17°C. Regardless of temperature, complete kill of T. obscuratus would be predicted to occur after 6 d of exposure to the 18%-CO2 atmosphere. We discuss how mortality-response surfaces can be used to help develop integrated controlled-atmosphere programs that are both effective against the pest and sensitive to the physiological tolerance of the produce.
Document Type: Research Article
Publication date: 1994-10-01
- 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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