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Prof. Fares Amin Mohamed Ellaqwa :: Publications:

Title:
EFFICIENCY OF CONTROLLED ATMOSPHERES CONTAINING VARIOUS CARBON DIOXIDE CONCENTRATIONS AND NITROGEN AGAINST THE KHAPRA BEETLE LARVAE TROGODERMA GRANARIUM EVERTS., (COLEOPTERA : DERMESTIDAE)
Authors: El-Lakwah, F.A.; Darwish, A.A.; Omnia .M. Khaled and El-Sayed, H.M.
Year: 1998
Keywords: Not Available
Journal: Not Available
Volume: Not Available
Issue: Not Available
Pages: Not Available
Publisher: Not Available
Local/International: Local
Paper Link: Not Available
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Abstract:

This study aims to investigate the effectiveness of different concentratiois of carbon dioxide in controlled (modified) atmospheres as well as a controlled atmosphere of more than 99 % nitrogen in controlling the active and diapausing larvae of the Khapra beetle. Trogoderma granarium (Everts) at various temperatures. Results of the experiments conducted at 16, 21. 26 and 31°C and 55±5 % RH. in the laboratory using the following five controlled (CA) atmospheres : 1- 96% CO2 : 3.2% N2 : 0.8% 02 2-68%C02 : 25.6 %N2 6,4%02 3-46 0/ CO2 : 43.2 % N2: 10.8 0/ 02 4-23 % CO2 : 61.6 % N2 + 15.4 % 02 5- CA of around 99.5 % N2 + 0.5 0/ 02 Showed the following : The exposure time required to obtain 99 % mortality at 16°C was 17, 34, 39, 75 and 8.1 days for the active larvae; and 25.6, 38, 46, 109 and 11.1 days for the diapausing larvae at the different aforementioned atmospheres, respectively. Exposure periods needed lo achieve 99 % kill at 21°C were 13.9. 23.1. 48.5. 62.5 and 7.3 days for the active larvae; and 216, 29.8, 58.0, 61 .6 and 7.4 days for the diapause one at the various CA. respectively. Time recorded to achieve 99 % mortality at 26°C was 8.9, 16.5, 20.3, 36.7 and 5.7 days for the active larvae and 10.7, 24.0, 36.4, 47.1 and 5.9 days for the diapausing larvae at the aforementioned CA, respectively. Exposure periods needed for 99 % mortality at 31°C were 7:8, 10.8, 18.7, 22.7 and 4.2 days for the active larvae: and 10.3, 20.1. 30.3, 42.0 and 5.7 days for the diapausing larvae at the aforementioned five controlled atmospheres, respectively. The results indicate clearly. that the diapausing larvae of T granariuin were more tolerant to time various tested atmospheres than the actïve one at all

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