تأثیر ارقام مختلف نیشکر روی ظرفیت پارازیتیسم و درصد ظهور بالغین Telenomus busseolae Gahan (Hym.: Platygasteridae) پرورش یافته روی تخم‌های Lefebvre Sesamia nonagrioides

The sugarcane stem borer, Sesamia nonagrioides (Lefebvre) (Lep: Noctuidae) is the most important pest of the sugarcane fields in Iran. Using resistant cultivars and biological control agent, Telenomus busseolae Gahan (Hymenoptera: Platygastridae), could be considered as efficient pest management strategy against the sugarcane stem borer. Effects of different sugarcane cultivars (CP48-103, CP57-614, CP69-1062, CP73-21, SP70-1143 and IRC99-02) on parasitism capacity, percentage parasitism and emergence of T. busseolae reared on S. nonagrioides eggs on sugarcane cultivars were evaluated under the laboratory conditions at 27±1°C, 60±5% RH, and a photoperiod of 16: 8 (L: D) h. The data of percentage parasitism and adult emergence of T. busseolae were analyzed by a one-way analysis of variance (ANOVA), and the statistical differences among the treatments were compared using Tukey’s HSD test at a 5% probability level. Data on parasitism rates were estimated using the computer program CONSUME-MSChart. Using the daily parasitism data, we calculated the age-stage-specific parasitism rate (cxj), age-specific parasitism rate (kx), age-specific net parasitism rate (qx), net parasitism rate (C0) and finite parasitism rate (ω(. Based on the results, the highest percentage parasitism and adult emergence of wasps was recorded on cultivars CP48-103 and CP69-1062, and the lowest was recorded on cultivar SP70-1143. The value of cxj on the first day of adult emergence on the CP69-1062 cultivar (61.10 eggs on the 15th day) and CP48-103 cultivar (56.57 eggs on the 14th day) were greater than other cultivars. Furthermore, the maximum value of cxj were on cultivars CP48-103 and CP69-103, while the minimum value was on cultivar SP70-1143. The maximum and minimum value of kx (the mean number of S. nonagrioides parasitized by T. busseolae at age x) was 23.58 eggs and 10.81 eggs on 16th day on the CP69-1062 and SP70-1143 cultivars, respectively. Also, the highest and lowest qx value of T. busseolae was on cultivars CP69-1062 and SP70-1143, respectively. The C0 values of the parasitoid (the mean number of eggs parasitized by an average individual parasitoid during its total lifespan) was highest on cultivars CP48-103 and CP69-103 and lowest on cultivar SP70-1143. The finite parasitism rate (ω) on the susceptible (CP48-103 and CP69-103) and resistant (SP70-1143) sugarcane cultivars was 0.353, 0.350 and 0.255 hosts per parasitoid, respectively. According to the obtained results, the sugarcane cultivars showed significant effect on parasitism capacity, percentage parasitism and percentage adult emergence of T. busseolae. The results indicated that cultivars CP48-103 and CP69-103 were appropriate and cultivar SP70-1143 was inappropriate for the increased efficiency of T. busseolae. These results can be useful for developing an efficient integrated pest management program against the sugarcane stem borer.