Abstract
Levels of resistance to the green leafhopper, Nephotettix virescens , a tungro virus vector in seven rice varieties with different genes for resistance and in a resistant and susceptible check, were determined by using greenhouse methods. The varieties differed significantly in relation to insect preference, survival of N. virescens nymphs, survival of adults, and number of eggs laid and insect population growth. There was no difference in percent egg hatch on the different varieties. Levels of resistance, as based on the greenhouse studies, were related to the percentage of tungro virus-infected plants, indicating the importance of N. virescens resistance in tungro virus control.
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