Author(s):

Ashwini R and PV Patil

Abstract: The warmer parts of wheat growing areas in the world are mainly affected by many diseases and among these, spot blotch or foliar blight caused by Bipolaris sorokiniana (Sacc.) Shoem. is one of the most concerning disease in warm and humid regions of India due to its widespread prevalence and increasing severity. Looking into significance of disease various commercially available botanicals viz., Crude pongamia oil, Soldier, Multineemore, Crude neem oil and Nimbicidin were evaluated in vitro against B. sorokiniana at 0.25, 0.50 and 1.0 per cent concentration, respectively. Maximum inhibition of mycelial growth was observed in multineemore at all the concentrations (0.25%: 51.85%, 0.50%: 52.22%, 1.0%: 54.81%) followed by nimbicidin (0.25%: 49.62%, 0.5%: 51.85%, 1.0%: 54.81%) and were significantly superior over other botanicals. Least inhibition was observed in crude pongamia oil at all the concentrations (0.25%: 34.07%, 0.50%: 34.07%, 1.0%: 35.18%) and it was followed by crude neem oil (0.25%: 34.81%, 0.50%: 35.18%, 1.0%: 36.29%) and soldier (0.25%: 34.07%, 0.50%: 34.81%, 1.0%: 54.81%). Irrespective of the concentrations tested, maximum mean inhibition of mycelial growth was observed in multineemore (52.96%) and it was followed by nimbicidin (52.09%) and soldier (41.23%). Increase in concentration increased the inhibition of mycelial growth by all the botanicals.

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