Comparative susceptibility of Corcyra cephalonica (Lepidoptera: Pyralidae) eggs to carbon dioxide and nitrogen at different temperatures |
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| Affiliation: | 1. Department of Economic Entomology and Pesticides, Faculty of Agriculture, Cairo University, Giza, Egypt;2. Department of Pests and Plant Protection, National Research Centre, Dokki, Giza, Egypt;1. School of Food Science and Engineering, South China University of Technology, Guangzhou, 510640, PR China;2. Department of Clinical Pharmacy, College of Pharmacy, University of Tennessee Health Science Center, Memphis, TN, 38163, USA;3. Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, Guangzhou, 510640, PR China;4. School of Applied Chemistry and Biological Technology, Shenzhen Polytechnic, Shenzhen, 518055, PR China;5. Department of Microbial Pathogenesis, School of Dentistry, University of Maryland, Baltimore, MD, 21201, USA;1. Department of Physical Chemistry, University of Plovdiv, 4000 Plovdiv, Bulgaria;2. Department of Chemistry, Technische Universität München, 85747 Garching, Germany;1. School of Science, Xihua University, Chengdu 610039, China;2. Department of Physics, Civil Aviation Flight University of China, Guanghan 618307, Sichuan, China |
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| Abstract: | The aim of this study was to evaluate the susceptibility of the egg stage of the rice moth Corcyra cephalonica to modified atmospheres (MAs) enriched with CO2 or N2 at 25, 30 and 35 °C combined with various exposure times. The tested modified atmospheres containing CO2 were 20% CO2, 16% O2 and 64% N2; 40% CO2, 12% O2 and 48% N2; 60% CO2, 8% O2 and 32% N2 and 80% CO2, 4% O2 and 16% N2. The tested modified atmospheres containing N2 were 97% N2 and 3% O2 and 98% N2 and 2% O2. The results showed that the hatchability responding to modified atmospheres enriched with either CO2 or N2 decreased significantly with an increase in exposure time, gas content (%) and temperature. All tested combinations provided complete (100%) egg control in less than 4 days. Based on 100% mortality, shorter exposures were obtained with 80% CO2 than with N2 at most tested temperatures. The modified atmospheres enriched with 98% N2 were more effective than 97% N2 against C. cephalonica eggs, especially at 35 °C. It is recommended to use high levels of CO2 in air (80%) and N2 (98%) in controlling 0–24-h-eggs of C. cephalonica within 24–36 h for CO2 and 18–72 h for N2. |
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| Keywords: | Carbon dioxide Nitrogen Reduced oxygen Stored product insects Toxicity |
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