Ovipositional preference of the Asian corn borer, Ostrinia furnacalis (Guenee), for different stages of corn and non-corn plants
2016
Caasi-Lit, M.T. | Barroga, J.B. | Javier, N.B. | Silvestre, A.R. | Malison, D.E. | Navarro, F.J.
The ovipositional behavior and preference of the Asian corn borer (ACB) for corn and non-corn plants were determined under semi-field conditions at IPB-BL2 screenhouse and under greenhouse conditions in a smaller steel cage at IPB-Sampaloc Area. Several trials were conducted in both sites from August to December 2015. There were nine plots in each site which represented the five treatments [2 T1 (30 DAP corn plants), 2 T2 (40 DAP corn plants), 2 T3 (natural weeds), 2 T4 (alternative host plants), and 1 T5 (40 DAP corn plants at infestation and release point). Fourth instar ACB larvae were introduced on corn plants at T5 for feeding and adult emergence. The sites were covered with mosquito net and with corn plants at T5 for feeding and adult emergence. The sites were covered with mosquito net and with flysheet to keep the test insects away from predators, prevent them from escaping, and protect them from strong rains. After 15-18 days, the net at T5 was removed to let the adult ACBs find their place to mate and lay eggs. Observation and collection of eggmasses were performed for 5-7 days after the removal of net. Most ACB eggmasses were gathered from T2 (40 DAP) corn plants, although there were some collected from T1 (30 DAP), napier and paragis of T4 (alternative hosts). Based on the results of several trials adult ACB females prefer to lay eggs corn plants at the reproductive stage.
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