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Prof. Mohamed Mohamed Mahmoud Azab :: Publications:

Title:
INFLUENCE OF TEMPERATURE ON THE EFFECTWENESS OF CONTROLLED ATMOSPHERERES OF VARIOUS CARBON DIOXIDE CONCENTRATIONS OR HIGH NITROGEN CONTENT ON TWO STORED PRODUCT INSECTS
Authors: El-Lakwah, F.A. *; Azab, M.M. * and Wesam, M. K. Ebrahim**
Year: 2004
Keywords: Not Available
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Local/International: Local
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Abstract:

The effect of controlled atmospheres (CAs) of 30 and 60% CO2 or 99.9% N2 at various temperatures (15, 20, 25, 30 or 35°C) and 60*5% R.H. was investigated on all developmentaj stages of Triboleum castaneum (Herbst) and active or diapausing larvae of Trogoderma granarium Everts). For Triboleum castaneum the egg stage was the most sensitive to CO2 at all tested temperatures. LT99s reduced from 3.8 days at 15°C to 2.8 days at 35°C under 30% CO2 and from 3.2 days at 15°C to 2.5 days at 35°C under 60% CO2. The susceptibility of pupal stage occupied the second range after the egg stage at all tested temperatures and CO2 concentrations. The larval stage was the least sensitive to 30% CO2 at all tested temperatures and at 25, 30, 35°C to 60% CO2 (LTs shortened from 16.6 days at 15°C to 5 days at 35°C under 30% CO2 and to 3.1 days at 35°C under 60% CO2). The adult stage was only the least sensitive to 60% CO2 at 15°C and 20°C (LTs decreased from 7.1 days at 15°C to 5.6 days at 20°C). Under CA of 99.9% N2 the larval and adult stages were the most sensitive at 15 to 30°C while the pupal and egg stages were the least sensitive. For Trogoderma granarium, the active larvae were more susceptible than the diapausing larvae only when exposed to 60% CO2 at all tested temperatures and 99.9% N2 at 35°C. LTs of active larvae decreased from 20.1 days at 15°C to 7.9 days at 35 °C under 60% CO2 and to 9.2 days at 35 °C under 99.9% N2, LT99s of diapausing larvae decreased from 43.4 days at 20°C to 9.1 days at 35°C under 60% CO2 and to 12.1 days at 35°C under 99.9% N2. It was concluded that 60% CO2 was most effective and the temperature dependence of the insect sensitivity to gases was noticeable at every stage. At the highest tested temperature (35 °C), slight mortality variation among the developmental stages of Tri boleurn caslaneurn or active and diapausing larvae of Trogodermcz granariurn was observed.

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