Sensitivity of Magnaporthe oryzae (rice blast) isolates to fungicides and their variability in Southern India

Authors

  • CH. YASHASWINI*, P. NARAYAN REDDY, B. PUSHPAVATI, CH. SRINIVASA RAO and M. SESHU MADHAV

Keywords:

Fungicides, Magnaporthe oryzae, Rice blast, sensitivity

Abstract

Of various biotic stresses hampering productivity of rice, blast (Magnaporthe oryzae) is a major fungal disease. Our present study is focused on evaluating the sensitivity of blast pathogenic isolates to fungicides and also their variability. A total of 20 M. oryzae isolates were isolated from selected districts of Andhra Pradesh and Telangana and screened through poisoned food technique for assessing their sensitivity to carbendazim (Bavistin®), tricyclazole (Beam®), isoprothiolane (Fuji One®) and kasugamycin (Kasu B®) at concentrations ranging from 100 to 500 ppm. Our results indicated that all the blast isolates were completely sensitive to carbendazim at 125, 250 and 500 ppm concentrations. This is followed by isoprothiolane that was effective concentrations with inhibition levels up to 92.3% at 500 ppm concentrations. Tricyclazole and kasugamycin have shown inhibitory effects up to 60.38% and 49.07% respectively at 500 ppm. Overall, our results indicated the sensitivity of these M. oryzae to commonly used fungicides.

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Issue

Vol. 69 No. 4s (2016): Indian Phytopathology : Special Issue

Section

Research Articles

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How to Cite

B. PUSHPAVATI, CH. SRINIVASA RAO and M. SESHU MADHAV, C. Y. P. N. R. (2016). Sensitivity of Magnaporthe oryzae (rice blast) isolates to fungicides and their variability in Southern India. Indian Phytopathology, 69(4s), 162-164. http://epubs.icar.org.in/ejournal/index.php/IPPJ/article/view/71262