Towards better Management of Bt-corn resistance to Asian corn borer, Ostrinia furnacalis (Guenee), in the Philippines: Biological and developmental studies of the pest on selected alternate Host Plants
2004
Caasi-Lit M.L., Fernandez, E.C., Taylo, L.O., de Jesus, E.G., Mantala, J.P., Latiza, I.L.(Philippine Univ. Los Baños, Laguna (Philippines) Inst. of Plant Breeding.)
With the increasing hectarage planted to Bt-corn in different regions of the country, the development of corn borer resistance may cause serious problems in the future. It is imperative that an appropriate insect resistance management scheme should be in place. This paper aims to provide baseline imformation on the different alternate host plants of ACB and the insects growth and development on said plants. Results of the survey conducted in three major corn-growing regions revealed that the potential alternate host crops are tomato, pepper, sitao, okra, cotton, and sugarcane whereas the potential weed hosts are aguingay, napier, tigoi, paragrass, and wild sorghum. for the biological and development studies, tomato, pepper, cotton, sitao, aguingay, napier, tigoi and corn were used. With some modifications of the rearing method used, ACB completed development (egg to adult) on corn and on the weeds aguingay, napier and tigbi but not on tomato an d pepper. It aopears that tomato and pepper are transient hosts for activities other than feeding and oviposition. Other techniques were developed using live plants to determine the most suitable stage of the host plant to use in cusay/feeding experiments. In the greenhouse, first instar ACB larvae infested onto 45-day-old aguingay, napier, tigbi, cotton and mungbean. Feed initially on the leaves of said hosts but later transferred to corn. The host preference experiments conducted in the laboratory and mini screen cages showed that corn, aguingay, and cotton were preferred for oviposition and feeding. Additional work should be conducted on the biology and development of ACB on the alternate hosts, the effectiveness of alternate hosts as "refugia" in a tropical setting, and whether their presence in Bt-corn field can trigger host-switching by ACB.
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