Temperature thresholds and degree-day requirements of Trissolcus vassilievi (Hym., Scelionidae), egg parasitoid of sunn pest, Eurygaster integriceps (Hem., Scutelleridae)
2010
MoeiniNaghadeh, N. | Kasraee, N. | Asgari, Sh. | Zamani, A. A. | Mahjoob, S. M.
The effects of eight constant temperatures (15, 17, 20, 25, 30, 35, 37 and 40¢ªC ¡¾ 1¢ªC) on developmental times, percentage of parasitism and emergence rate of Trissolcus vassilievi (Hym., Scelionidae) egg parasitoid of Eurygaster integriceps, were evaluated in laboratory. The developmental period ranged from 7.667 (37 ¢ªC) to 43.045 (15¢ªC) for males and from 8.02 (37¢ªC) to 46.17 days (15¢ªC) for females. The thermal constant required for development from egg to adult emergence of male and female T. vassilievi were estimated 178.46 DD and 187.78 DD respectively. The lower developmental thresholds (T0) of male and female estimated by using linear regression equation to be 10.81 and 11.33¢ªC respectively. The lowest and highest parasitism percentage of T. vassilievi varied from 31.00 ¡¾ 2.08 (40 ¢ªC) to 97.67 ¡¾ 1.45% (25¢ªC). No adult emergence were observed at 40¢ªC.
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