Journal article
Determining thermotolerance of fifth-instar Cydia pomonella (L.) (Lepidoptera: Tortricidae) and Amyelois transitella (Walker) (Lepidoptera: Pyralidae) by three different methods
Journal of stored products research, Vol.45(3), pp.184-189
2009
Handle:
https://hdl.handle.net/2376/109802
Abstract
Thermotolerances of codling moth,
Cydia pomonella (L.) (Lepidoptera: Tortricidae), and navel orangeworm,
Amyelois transitella (Walker) (Lepidoptera: Pyralidae), were determined using two water-immersion methods and one dry-heat method. The two water-immersion methods were: 1) directly immersing screen tubes containing test insects in hot water (direct immersion method) and 2) immersing in hot water solid copper tubes containing insects submerged in tap water (tube immersion method). The dry heating method involved heating insects in computer-controlled heating blocks (heating block system, or HBS). Each test insect was treated at three temperature-time combinations and exposures were adjusted so that each method received the same equivalent accumulated lethal time. In five of the six tests, the HBS provided the lowest mean insect mortality among the three methods, although no statistically significant differences were observed between the direct immersion and the HBS methods. The mean insect mortality obtained with the tube immersion method was significantly higher than that from the direct immersion method and the HBS in four and three of the six temperature-time combinations, respectively. When compared with the two water-immersion methods, the HBS method yielded lower mortality data with less variation at the same mortality level, resulting in more conservative treatment recommendations.
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Details
- Title
- Determining thermotolerance of fifth-instar Cydia pomonella (L.) (Lepidoptera: Tortricidae) and Amyelois transitella (Walker) (Lepidoptera: Pyralidae) by three different methods
- Creators
- S Wang - Department of Biological Systems Engineering, Washington State University, 213 L. J. Smith Hall, Pullman, WA 99164-6120, USAJ.A Johnson - United States Department of AgricultureJ.D Hansen - USDA-ARS Yakima Agricultural Research Laboratory, 5230 Konnowac Pass Road, Wapato, WA 98951, USAJ Tang - Department of Biological Systems Engineering, Washington State University, 213 L. J. Smith Hall, Pullman, WA 99164-6120, USA
- Publication Details
- Journal of stored products research, Vol.45(3), pp.184-189
- Academic Unit
- Department of Biological Systems Engineering
- Publisher
- Elsevier Ltd
- Identifiers
- 99900547119101842
- Language
- English
- Resource Type
- Journal article