Response of brown planthopper to silica in different rice varieties
1993
Chaiyawat, P. | Bottrell, D.G. | Bernardo, E.N. (International Rice Research Inst., Los Banos, Laguna (Philippines))
To determine the effect of silica in rice plants on survival of the brown planthopper [BPH] (Nilaparvata lugens Stal.), five rice varieties (TN1, IR22, IR46, IR72 and Mudgo) were grown in nutrient solution having different concentrations of silica (0, 100, 200, 300, and 400 ppm). The experiment was in split plot design with four replications. Ten 1-day old first instar BPH nymphs were confined (in a mylar cage) on a plant (45 days old) receiving one of the silica treatments. The BPH population growth indexes were significantly higher on rice grown without silica than on those provided with silica. However, at the "0" level of silica, the population growth indices were not significantly different among BPH-resistant (IR72 Mudgo), moderately resistant (IR46) and susceptible (TN1, IR22) rice varieties. The results indicate that the level of silica in the soil and ability of the rice genotype to absorb the element may determine the level of resistance to BPH
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