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Your search keyword '"Johnson, Judy"' showing total 17 results
Start Over Author "Johnson, Judy" Journal journal of economic entomology
17 results on '"Johnson, Judy"'

2. Thermal Death Kinetics of Conogethes Punctiferalis (Lepidoptera: Pyralidae) as Influenced by Heating Rate and Life Stage.

Author

LIXIA HOU, YANLI DU, JOHNSON, JUDY A., and SHAOJIN WANG

Subjects
LEPIDOPTERA, INSECT mortality, HEAT treatment, GERMINATION, RADIO frequency, CHESTNUT diseases & pests
Abstract

Thermal death kinetics of Conogethes punctiferalis (Guenée) (Lepidoptera: Pyralidae) at different life stages, heating rate, and temperature is essential for developing postharvest treatments to control pests in chestnuts. Using a heating block system (HBS), the most heat-tolerant life stage of C. punctiferalis and the effects of heating rate (0.1, 0.5, 1, 5, and 10°C/min) on insect mortality were determined. The thermal death kinetic data of fifth-instar C. punctiferalis were obtained at temperatures between 44 and 50°C at a heating rate of 5°C/min. The results showed that the relative heat tolerance of C. punctiferalis was found to be fifth instars>pupae> third instars> eggs. To avoid the enhanced thermal tolerance of C. punctiferalis at low heating rates (0.1 or 0.5°C/min), a high heating rate of 5°C/min was selected to simulate the fast radio frequency heating in chestnuts and further determine the thermal death kinetic data. Thermal death curves of C. punctiferalis followed a 0th-order kinetic reaction model. The minimum exposure time to achieve 100% mortality was 55, 12, 6, and 3 min at 44, 46, 48, and 50°C, respectively. The activation energy for controlling C. punctiferalis was 482.15 kJ/mol with the z value of 4.09°C obtained from the thermal death–time curve. The information provided by thermal death kinetics for C. punctiferalis is useful in developing effective postharvest thermal treatment protocols for disinfesting chestnuts. [ABSTRACT FROM AUTHOR]

Published
2015
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17. Gamma Radiation as a Quarantine Treatment for Fuller Rose Beetle Eggs (Coleoptera: Curculionidae) on Citrus Fruit

Author

Johnson, Judy A., Soderstrom, Edwin L., Brandl, David G., Houck, Laurie G., and Wofford, Pamela L.

Abstract

Since 1985 when eggs of the Fuller rose beetle, Pantomorus cervinus (Boheman), were found by Japanese fruit inspectors under the calyxes of California citrus, researchers have sought to develop alternatives to methyl bromide fumigation as a suitable quarantine treatment for this pest. Three different ages of Fuller rose beetle eggs laid on waxed paper were exposed to gamma radiation doses of 10, 50, 100, and 150 Gy. The oldest age class (10-13 d old) was the least susceptible. Egg hatch of the two younger age classes (1-3 and 6-8 d old) was prevented by 50 Gy, whereas 150 Gy was needed to prevent hatch of older eggs. To confirm the efficacy of the method, lemons infested with 10- to 13-d-old Fuller rose beetle eggs were placed in the center of standard cardboard lemon cartons and irradiated at doses averaging 174.1 Gy. Egg hatch from egg clusters infesting untreated lemons averaged (x ± SEM) 42.5% ± 4.66 per lemon. None of the estimated 6,500 eggs infesting irradiated lemons hatched. Damage of irradiated fruit varied but did not exceed a 6.1% increase compared with damage found in controls. These data show that irradiation of lemons could be an effective quarantine treatment against Fuller rose beetle eggs.

Published
1990
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