اثر دماهاي مختلف بر خصوصيات زيستي و جدول زندگي دو گونه زنبور Aphidius rhopalosiphi پارازيتوئيدهاي شته Metopolophium dirhodum در شرايط آزمايشگاهي

The Effects of Different Temperatures on Biology and Life Tables of Aphidius Rhopalosiphi and Praon Volucre, Parasitizing Metopolophium Dirhodum under Laboratory Conditions

The biology and life tables of Aphidius rhopalosiphi De S.P. and Praon volucre (Hal.) (Hym: Aphidiidae) were studied at temperatures of 16, 20, 24 and 28°C on Metopolophium dirhodum (Wlk.) (Hom: Aphididae). At the above temperatures developmental periods from egg-to-adult were 22.86,16.93, 14.25 and 10.39 days for A. rhopalosiphi; 21.62, 17.44, 14.19 and 10.39 days for P. volucre respectively. Temperature thresholds (t) and thermal constants (DD) of A. rhopalosiphi were 6.03°C and 237.03 DO, and those of P. volucre were 5.43°C and 245.16 degree-days. Mean adult longevities of A. rhopalosiphi lasted 11.15, 8.52, 7.20 and 6.50 days, while the adults of P. volucre lived for 13.18, 12.32, 8.80 and 7.05days at the experimental temperatures. Mean number of eggs at the same conditions were 296.15,270.22, 168.52 and 69.09 for A. rhopalosiphi; 334.67,389.82,263.26 and 123.19 for P. volucre. The intrinsic rates of increase were also 0.200, 0.249, 0.252 and 0.249 for A. rhopalosiphi; 0.183, 0.245, 0.268 and 0.276 for P. volucre respectively.