Assessment of efficacy of pesticides applied singly and in combination on rice sheath blight disease development


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Authors

  • G. PRAKASH*, R.T.P. PANDIAN, H. RAJASHEKARA, PRATIBHA SHARMA and U.D. SINGH

Keywords:

Disease severity, pesticides, relative vertical spread, rice, sheath blight, yield parameters

Abstract

Efficacy of commonly used pesticides namely carbendazim (0.1%), hexaconazole (0.1%), endosulfan (0.042%), chlorpyriphos (0.02%), thiobencarb (0.3%) and butachlor (0.4%) applied singly and in combination were evaluated against rice sheath blight (Rhizoctonia solani), during kharif 2010 and 2011 under pot culture conditions. Among the various pesticide combinations, carbendazim (0.1%) applied along with endosulfan (0.042%) was found to be the most effective against sheath blight, where the lowest mean disease severity was 17.36% and the relative vertical spread (RVS) was  4.18%. This combination increased the grain yield and straw yield by 85.68% and 111.73%, respectively in comparison to R. solani inoculated control without any pesticide. This was followed by hexaconazole (0.1%) combined with endosulfan (0.042%), where the mean disease severity was 19.84% and the relative vertical spread was 16.34%. It increased the grain yield by 72.21% and straw yield by 104.37% when compared to R. solani inoculated control without any pesticide. In case of individual application of carbendazim, the mean disease severity and relative vertical spread were observed to be 24.81% and 22.37%, respectively. Per cent increase in grain yield and straw yield were recorded as 29.86% and 61.94%, respectively. Treatment with hexaconazole alone reduced the mean disease severity up to 27.71% and relative vertical spread of 25.06%. It increased grain yield up to 28.10% and straw yield up to 60.35%. Thus, it is evident that, combined application of pesticides not only shows higher efficacy in controlling the disease, but also increases grain yield and straw yield.

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Issue

Vol. 68 No. 3 (2015): Indian Phytopathology

Section

Research Articles

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How to Cite

H. RAJASHEKARA, PRATIBHA SHARMA and U.D. SINGH, G. P. R. P. (2015). Assessment of efficacy of pesticides applied singly and in combination on rice sheath blight disease development. Indian Phytopathology, 68(3), 248-253. https://epubs.icar.org.in/index.php/IPPJ/article/view/49834