Susceptibility of different life stages of saw-toothed grain beetle Oryzaephilus surinamensis (L.) (Coleoptera: Silvanidae) to modified atmospheres enriched with carbon dioxide |
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Authors: | Mohamed Y. Hashem Sayeda S. Ahmed Mohsen A. El-Mohandes Mahrous A. Gharib |
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Affiliation: | 1. Department of Economic Entomology and Pesticides, Faculty of Agriculture, Cairo University, Giza, Egypt;2. Environment and Bio-agriculture Department, Faculty of Agriculture, Al-Azhar University, Cairo, Egypt;3. Plant Protection Research Institute, ARC, Giza, Egypt |
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Abstract: | The susceptibility of the different life stages of the saw-toothed grain beetle Oryzaephilus surinamensis to different modified atmospheres (MAs) containing various concentrations of carbon dioxide (CO2) was studied as an alternative to methyl bromide fumigation at 30 °C and 65 ± 5% relative humidity (r.h.). The tested MAs were 55%, 65%, 75% and 85% CO2 gas in the air. Mortality (%) was recorded after exposure periods of 3, 6, 12, 24, 48, 72 and 96 h. Larvae and adults were more susceptible while eggs and pupae were more tolerant to CO2. A two-day exposure period was adequate to completely kill larvae and adults under all tested MAs. All eggs and pupae were killed after four days of exposure to the high-CO2 atmospheres (75% and 85%). |
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