Author/Authors :
Ali, Asrar institute of advance studies - Pakistan Agricultural research council, Pakistan , Ehsan-ul-Haq National Agricultural Research Centre - Department of Plant and Environmental Protection, Insect Pest Management Program, Pakistan , Khan, Javed National Agricultural Research Centre - Department of Plant and Environmental Protection, Insect Pest Management Program, Pakistan , Gillani, Waseem Ahmad National Agricultural Research Centre - Department of Plant and Environmental Protection, Insect Pest Management Program, Pakistan , Rehman, Abdul National Agricultural Research Centre - Crop sciences Institute - Rice program, Pakistan , Mahmood, Tariq National Agricultural Research Centre - Department of Plant and Environmental Protection, Insect Pest Management Program, Pakistan , Javed, Habib Iqbal National Agricultural Research Centre - Department of Plant and Environmental Protection, Insect Pest Management Program, Pakistan , Rasool, Awais National Agricultural Research Centre - Department of Plant and Environmental Protection, Insect Pest Management Program, Pakistan
Abstract :
The effect of three constant temperatures i.e. 22±1˚C , 28±1˚C and 34±1˚C on the biological parameters of Menochilus sexmaculatus Fab. was studied at Insectary-biological control laboratories, National Agricultural Research Centre Islamabad during 2012.There was a significant effect of temperatures on the developmental durations and predatory potential of M. sexmaculatus reared on Schizaphis graminum aphid. The incubation period was 4.22±0.12, 3.64±0.11 and 2.12±0.11 days with 73.2±3.07, 80.8±2.06 and 64.8±3.50 percent hatchability. The total larval duration was 9.48±0.09, 7.89±0.07 and 5.65±0.07 days. The predatory potential of larval stage was ranged from 161 to 184 aphids/larvae. The pupal duration was 4.28±0.08 3.69±0.05 and 2.24±0.06 days. The results indicate that temperature have significant effect on the developmental durations and predatory potential of Menochilus sexmaculatus. The adult female longevity at three constant temperatures was 56.83±0.45, 42.47±0.42 and 36.07±0.32 days with fecundity rate of 452.13±8.20, 631.23±10.79 and 473.67±8.31 eggs per female when feeding on Schizaphis graminum aphid. The adult predatory potential of female beetle was significantly higher than male. The adult male consumed aphids range from 2468 to 2501 and female consumed from 3175 to 3356 aphids. The result of the present study indicates that temperature has significant effect on duration, survival and predatory potential of the predatory. Coccinellid and with increasing temperature the duration significantly decreased. The optimum temperature for quality mass rearing of the predator was 28±1˚C out of the tested temperatures.
Keywords :
Biology , Menochilus sexmaculatus , predatory potential , Schizaphis graminum aphid , temperatures
