مطالعه مقایسه‌ای برخی صفات بیولوژیکی جمعیت وحشی و آزمایشگاهی زنبور انگل‌وارۀ Telenomus busseolae روی تخم ساقه‌خوار نیشکر Sesamia spp.

One of the most important insect pests of sugarcane in Khuzestan province is the two stem borers, Sesamia cretica Lederer and S. nonagrioides Lefevere (Lep.; Noctuidae), which can cause significant quantitative and qualitative damage to the sugarcane yield annually. The parasitoid wasp, Telenomus busseolae (Hym.; Scelionidae) is considered the most important natural enemy of sugarcane stem borers in the sugarcane fields of Khuzestan province, which plays an important role in regulating the host population. In order to investigate some biological traits of the parasitoid wasp, T. busseolae on the sugarcane stem borers’ eggs, two wild and reared populations of this biocontrol agent were studied. In the current study, the parasitism efficacy, the emergence percentage, and the sex ratio of field and insectarium populations were determined. The results of the paired t-test analysis showed that the parasitism rate, emergence rate, and sex ratio of wild population the parasitoid wasp, T. busseolae were 89.11 %, 90.21 %, and 66.78 % female, respectively, while the value these parameters in the reared population of this biocontrol agent on the eggs of Sesamia spp. 86.67 %, 89.14 %, and 59.45 % female respectively were estimated. The findings also confirm that the parasitism percentage (df= 13, t= -1.75, P= 0.11) and emergence rate (df= 13, t= -0.56, P= 0.58) in wild and reared populations did not have a statistically significant difference, while the sex ratio in both of studied populations had a statistically significant difference (df=13, t=-2.30, P=0.03). Based on the obtained results, the parasitoid wasp of sugarcane stem borers in mass rearing has favorable biological characteristics and has significant parasitism efficiency compared to wild populations. Therefore, the reared populations in insectarium can control the sugarcane stem borers as well as in nature.