Comparative study on varietal resistance to rice green leafhoppersNephoteitix virescens (Distant) andN. nigropictus (St⇘l)

Viswanathan, Kasi; Kalode, M. B.

doi:10.1007/bf03186227

Cited by 4 publications

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“…3.2a biosis to both N. virescens and N. nigropictus (Viswanathan and Kalode 1984). Even with release of 100 first instar nymphs per plant, in the present studies, the damage on resistant varieties was considerably low (figure 3) since there was a high mortality of insects and only meagre population could survive on these varieties.…”

Section: Studies On Antibiosis Mechanismmentioning

confidence: 72%

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Nature of resistance in selected rice varieties and population fluctuation of green leafhoppers,Nephotettix virescens (Distant) andNephotettix nigropictus (Stål)

Viswanathan

Kalode

1987

Proc. Indian Acad. Sci. (Anim. Sci.)

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In multiple 'Choice tests with 30-day-old plants of resistant and, susceptible varieties. both the species of green leafhoppers, N ephotettix »irescens (Distant) and N ephotettlx niqropictus (Stal) exhibited relative non-preference to highly resistant varieties (Ptb 2, Ptb 7 and Ptb 18) both for settling and oviposition. Even when 100 first instar nymphs were caged on individual 25-day-old plants of highly resistant varieties, the plants suffered very low damage and also induced high mortality of nymphs. Different ages of the plants had no influence on the antibiosis mechanism of resistant varieties. Feeding behaviour studies revealed that both the species made more punctures and excreted less honeydew while feeding on resistant varieties than on susceptible ones. Histological studies indicated no mechanical barrier for feeding in resistant varieties.. Field investigations indicated that resistant varieties viz Ptb 18, Ptb 2 and Ptb 7 harboured less population of green leafhoppers and had relatively nil or very low incidence of tungro virus disease. An year round survey in the rice ecosystem and marshy habitat where Leersia hexandra grows in abundance revealed that although both the species coexisted in rice fields, Nephotettix niqropictus alone was present in the marshy habitat.

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Section: Studies On Antibiosis Mechanismmentioning

confidence: 72%

“…Earlier, Viswanathan and Kalode (1984) reported 10 rice varieties to be greatly detrimental to insect bionomics using 1st instar nymphs and adults of both green leafhoppers (N. virescens and N. nigropictus). We now describe the mechanism of resistance in selected rice varieties and population fluctuation in rice ecosystem.…”

Section: Introductionmentioning

confidence: 99%