Journal of Applied and Natural Science 5 (1): 24-29 (2013)
A study on fungicides potential and incidence of sheath rot of rice caused by Sarocladium oryzae (Sawada)
Lalan Sharma1, D. T. Nagrale1*, S. K. Singh, K. K. Sharma, and A. P. Sinha
1National Bureau of Agriculturally Important Microorganisms, Kusmaur, Maunath Bhanjan-275101(U.P.), INDIA
Department of Plant Pathology, College of Agriculture, G. B. Pant University of Agriculture and Technology, Pantnagar- 263145 (UK), INDIA
*Corresponding author. E-mail: firstname.lastname@example.org
Abstract : Sheath rot, Sarocdadium oryzae (Sawada) Gams. and Hawksw., has recently become a serious disease of rice when climatic conditions are unfavorable during flag sheath development. In this study systemic and non-systemic fungicides were tested against S. oryzae. Maximum inhibition of radial growth (76.53%) was recorded at 10.0ppm of tebuconazole fungicides. In non-systemic fungicides, maximum inhibition of radial growth (78.86%) was recorded at 200.0ppm. Comparative efficacy of fungicides on sheath rot was tested during Kharif 2008-2009. Foliar spray of tebuconazole was found superior overall other treatments giving reduction in disease severity (59.01-64.33%), which was followed by followed by carbendazim (48.70-55.28%), and also increased grain yield per plant (45.06-65.84%), grain yield per plot (45.57-65.85%), 1000-grains weight (10.80-52.58%) and reduction in chaffiness (48.07-53.80%). Among non-systemic fungicides chorothalonil was found best in managing sheath rot, giving reduction in disease severity (35.68-38.85%), and also increased grain yield per plant (24.78-44.74%), grain yield per plot (24.52-44.57%), 1000-grains weight (4.25-35.47%) and reduction in chaffiness (15.74-45.96%) as compared to check. Another field experiment was conducted during Kharif 2009-10 to observe sheath rot incidence on rice cultivars in Tarai region. The incidence was recorded in thirty three varieties; only varieties (Type-3 and Basmati-370) were recorded as free from disease symptoms.
Keywords : Fungicides, Germplasm, Sarocladium oryzae, Sheath rot.