Evaluation of bio-efficacy of tebuconazole 25 WG against alternaria blight and powdery mildew diseases of cumin 

Abstract

Blight and powdery mildew are very destructive diseases of cumin and they may cause complete failure of crop, if proper and timely precautionary measures are not taken. For the effective and economic management of cumin blight and powdery mildew, field trial was undertaken during rabi 2014-15 and rabi 2015-16 to determine the effectiveness of tebuconazole 25 WG against blight and powdery mildew on cumin. Different treatments with their prefixed concentrations were compared with control. On the basis of the two years investigation it has been concluded that tebuconazole 25 WG @ 750 g/ha was found effective against Alternaria blight (Alternaria burnsii) and powdery mildew (Erysiphe polygoni) diseases of cumin with increase in the yield. Higher dose of tebuconazole 25 WG @ 1500 g/ha did not produce any phytotoxic symptoms on cumin crop at different crop stages during sprays. This indicated that tebuconazole 25 WG is non-phytotoxic to cumin crop.