The significance of morphometric and fecundity differences between the ‘biotypes' of the Brown Planthopper, Nilaparvata lugens
1984
Claridge, M.F. | Hollander, J. | Haslam, D.
A morphometric analysis of biotypes 1, 2 and 3 from the International Rice Research Institute, Philippines, reared respectively on rice cultivars TN1, Mudgo and ASD7, showed significant differences, but some overlap between them. When the three biotypes were each reared for a single generation on TN1, morphometric differences were very greatly reduced and the distributions widely overlapped. Biotypes 2 and 3 were significantly less fecund than biotype 1 when reared on their normal host varieties. When all were reared on TN1, biotype 3 showed a somewhat lower fecundity than did 1 and 2, but the difference was less than previously reported. It is concluded that the evidence for the association of morphometric differences with virulence characteristics in N. lugens is not proved. Equally there is no evidence that morphometric data may be used to identify field populations with distinct patterns of virulence.
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