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Susceptibility of different life stages of Indian meal moth Plodia interpunctella Hubner and almond moth Ephestia cautella Walker Lepidoptera Pyralidae to modified atmospheres enriched with carbon dioxide



Susceptibility of different life stages of Indian meal moth Plodia interpunctella Hubner and almond moth Ephestia cautella Walker Lepidoptera Pyralidae to modified atmospheres enriched with carbon dioxide







The susceptibility of the different life stages of the Indian meal moth Plodia interpunctella and almond moth Ephestia (Cadra) cautella to different modified atmospheres (MAs) containing various concentrations of carbon dioxide (CO2) was studied as an alternative to methyl bromide fumigation at 27 C and 6 5% relative humidity (r.h.). The MAs tested were 4%, 6% and 8% CO2 in air at different exposure times. showed that five days were adequate to kill all eggs and pupae of the two moths under all tested MAs. Exposure time needed to be extended to 6 and 7 days at 8% CO2 to obtain complete mortality of larva of E. cautella and P. interpunctella, respectively. The order of sensitivity of P. interpunctella to MAs was: egg = pupa > larva, while for E. cautella it was: pupa > egg > larva. Generally, eggs and pupae of P. interpunctella were more sensitive to MAs than those of E. cautella but the larvae of the latter were more sensitive. Five days were adequate to completely kill eggs and pupae of the two moths. Exposure time could be extended to 7 days to obtain a complete mortality in larvae. The sensitivity of P lodia interpunctella to MAs ordered as, egg = pupa > larva. The sensitivity order to MAs was pupa > egg > larva in E phestia cautella.

Accession: 036510981

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