Effect of neem oil on tungro (RTV) infection in susceptible and resistant varieties
1987
Aiyanathan, K.E.A. | Narayanasamy, P. (Tamil Nadu Agricultural Univ., Coimbatore (India). Plant Pathology Dept.)
RTV [rice tungro virus] susceptible and resistant cultivars were inoculated using 1, 3, and 5 viruliferous green leafhoppers (GLH) Nephotettix virescens per plant. Neem oil (5%) was applied to seedlings two hours before inoculation. Increasing the number of insects increased infection from 50 to 95% in susceptible ADT31 and from 5 to 35% in resistant TNAU 8315. In ADT31, neem oil significantly reduced infection rates when one GLH was used for inoculation. A similar reduction was observed with inoculation using three or five GLH plant. All treated plants of TNAU 831520 were free of infection when one GLH was used for inoculation. Neem oil reduced infection to 10% in resistant plants inoculated using three or five insects.
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