K. PULLAM RAJU*, P. RAJASEKHAR, C.P.D. RAJAN AND N. C. VENKATESWARLU
Department of Entomology, S.V. Agricultural College, ANGRAU, Tirupati – 517 502, A.P.
Five insecticides and three fungicides at recommended concentrations were evaluated as tank mix in various insecticide and fungicide combinations for their efficacy against stem borer and stem rot in rice. Among the different combinations tested no phytotoxic symptoms were observed indicating that all the combinations are safe to the rice crop. The chemical compatibility of insecticide and fungicide combinations measured through the bioefficacy studies under field conditions revealed that they insecticides, flubendiamide @ 0.1 ml/l (1.5% DH and 1.06% WE) and chlorantraniliprole @ 0.3 ml/l (1.9% DH and 1.16% WE) were highly effective against leaf folder and their combination with fungicide in no way undermined the efficacy when mixed indicating their compatibility. Similarly the fungicides hexaconazole @ 2.0ml/l (8.5%), propiconazole @ 1.0 ml/l (9.2%) were highly effective against stem rot alone and in combination with other insecticides with low per cent of disease incidence. Thus all the insecticides and fungicides used in the present investigation are compatible with each other and can be safely combined as tank mix for control of rice pests.
Pesticides, Compatibility, Phytotoxicity and Efficacy.