ANTIFEEDANTS OF RICE PLANTHOPPERS IN SOME MILLETS

Feeding behaviors of three species of planthopper, Nilaparvata lugens, Sogatella furcifera and Laodelphax striatellus, were examined against some species of millets. Finger millet and Indian barnyard millet are resistant to N. lugens and S. furcifera, while serving as one of the host plants for L. striatellus. In the case of Japanese barnyard mille t, N. lugens only cannot select it as a host plant. Through the biolog ical and chemical studies, we have come to the conclusion that the res istance of these millets to each planthopper species is due mainly to the presence of multiple antifeedants.