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Effects of prolonged mass rearing on life history traits of Habrobracon hebetor (Hymenoptera: Braconidae)

Badran Fatima, Yaghoub Fathipour, Abdoolnabi Bagheri, Mohammadreza Attaran, Gadi V. P. Reddy
International journal of pest management 2022 v.68 no.3 pp. 246-255
Habrobracon hebetor, fecundity, females, life history, life tables, parasitoids, pest management, sex ratio
Long-term mass rearing of parasitoids under laboratory conditions may affect their quality. We studied the quality of Habrobracon hebetor (Say) (Hymenoptera: Braconidae) reared for more than 20 generations (G) using two-sex life table parameters. We found that G2 had the longest pre-adult development time (12.4 d) and the highest fecundity (1304.00 eggs/female) compared with the other generations. While no significant differences in the intrinsic rate of increase (r) and net reproductive rate (R ₀) were found among G4, G6, G8, G15, and G20, the highest values of r (0.3273 day⁻¹) and R ₀ (436.28 eggs/individual) as well as the shortest mean generation time (T) were observed in G10. In addition, significant differences in sex ratio (F/F + M) were observed among different generations, ranging from 17% in G2 to 60% in G10. These results suggest that up to a certain number of generations (G10), the quality of H. hebetor significantly increased without adding field-collected parasitoids or changing the factitious host. To maintain the quality of the colony beyond this point, it should be rejuvenated by periodically adding field-collected individuals.