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The efficacy of neem oil and neem-extracted substances on the rice leafhopper Nephotettix virescens (Distant)

, : The efficacy of neem oil and neem-extracted substances on the rice leafhopper Nephotettix virescens (Distant). Journal of the National Research Council of Thailand 21(2): 37-58

Neem oil was extracted from neem seeds, and further extraction was performed by water and other solvents. The repellent action of neem oil at 10% and upwards to the rice pest Nephotettix virescens was found to increase with increasing oil concn. Neem extracted by distillation was more effective than neem oil against female cicadellids. Of 3 extracts obtained by distillation (N1, N1M and N2), N1 was the best, followed by N2 and pure water, resp.

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