ABDEL-SAMEA, S., EL-METWALLY, M., MARZOUK, R. (1998). COOLING CERTAIN LEPIDOPTEROUS INSECT EGGS IN RELATION TO THEIR HATCHABILITY. Egyptian Journal of Agricultural Research, 76(3), 993-1002. doi: 10.21608/ejar.1998.358468
SAADIA A. ABDEL-SAMEA; METWALLY F. EL-METWALLY; RAHIM A. MARZOUK. "COOLING CERTAIN LEPIDOPTEROUS INSECT EGGS IN RELATION TO THEIR HATCHABILITY". Egyptian Journal of Agricultural Research, 76, 3, 1998, 993-1002. doi: 10.21608/ejar.1998.358468
ABDEL-SAMEA, S., EL-METWALLY, M., MARZOUK, R. (1998). 'COOLING CERTAIN LEPIDOPTEROUS INSECT EGGS IN RELATION TO THEIR HATCHABILITY', Egyptian Journal of Agricultural Research, 76(3), pp. 993-1002. doi: 10.21608/ejar.1998.358468
ABDEL-SAMEA, S., EL-METWALLY, M., MARZOUK, R. COOLING CERTAIN LEPIDOPTEROUS INSECT EGGS IN RELATION TO THEIR HATCHABILITY. Egyptian Journal of Agricultural Research, 1998; 76(3): 993-1002. doi: 10.21608/ejar.1998.358468
COOLING CERTAIN LEPIDOPTEROUS INSECT EGGS IN RELATION TO THEIR HATCHABILITY
Plant Protection Research Institute, Agricultural Research Centre, Giza, Egypt
Abstract
Different ages of the pink stalk borer, Sesamia cretica (Led.); Eu-ropean corn borer, Ostrinia nubilalis (Hubn.), cotton leaf worm, Spodop-tera littoralis (Boisci.) and greasy cutworm, Agrotis ipsiion (Hufn.) eggs were cooled at 5±0.5, 10±0.5 and 15±0.5°C for different periods to evaluate their viability under these conditions. The following results were achieved: - Cooling eggs of the considered insects delayed hatching in most cases and decreased their viability_ - It could successfully keep Sesamia eggs, 2 days old, for 5, 9 and 11 days at the three mentioned temperatures, respectively without affecting their viability (100%). - Ostrinia eggs, aged 2-3 days, could be kept at 10±0.5°C for about 2 days with 88_6 - 100_0% viability. At higher temperature, eggs of 3 days old were successfully kept for a longer period (9 days) with a complete viability. Agrotis eggs (2 days old) could be kept for 10, 3 and 2 days with their normal viability at three cooling degrees, respectively. Spodoptera eggs of the same age were kept for relatively shorter periods; 1, 4 and 4 days at these degrees with their complete viability.