Directional and random dispersal of adult Asian corn borer (ACB), Ostrinia furnacalis (Guenee) (Lepidoptera: Crambidae)
2016
Navasero, M.V. | De Panis, W.N. | Bangangao, M.T. | Navasero, M.V. | Caasi-Lit, M.T.
Study on adult dispersal behavior of ACB using mark-recapture method was conducted in Brgy. [Village] Rang-ay, Banga, South Cotabato [Philippines] from September to October 2015. Results showed that the number of recaptured marked adult ACB in 36 designated sampling points (44 individuals) was much lower compared to that in only 19 sampling points (103 individuals) from weedy areas. This suggests directional rather than random flight dispersal in majority of adult ACB onto weedy areas. However, those that remained in corn are still of significant proportion. Marked ACB were recaptured from as near as 10-20 meters from the release point. This has implications in the deployment of non-Bt corn refuge. The recommended structured refuge planted 100 m apart was probably based on random flight dispersal and may not be sufficient to address mating among potentially resistant short range fliers and susceptible ACB away from the non-Bt refuge.
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