Management of Rice Blast Caused by Pyricularia oryzae with Psedomonas Fluorescens and Fungicides

Abstract

Rice blast caused by Pyricularia oryzae is a major disease affecting rice production. Along with chemical management, bio-control approach for mana~g blast disease is considered to be a practical and economical alternative. In this regard, a study was carried out at Crop Research Centre of the Sardar Vallabhbhai Patel University of Agriculture & Technology, Meerut during kharif 2013. Four different Basmati rice varieties viz. PB-1, PB-1121, PB-6 and Vallabh-22 were undertaken for the managing the blast incidence and severity. In order to manage the blast disease, two fungicides (Carbendazim and Tricyclazole), and bio-agent (Pseudomonas fluorescens) were evaluated under in-vitro and field condition against rice blast caused by Pyricularia oryzae. Different treatments were given to manage the disease incidence/severity and growth promotion of the rice plant. Under in-vitro, maximum inhibition (100 %) was achieved by Carbendazim at 0.1 %, 0.2 % and 0.4 % concentration while Tricyclazole gave 100 % inhibition at 0.06 % and 0.12 % followed by 98.93 % inhibition at 0.03 %concentration. and P. jluorescens showed maximum inhibition (59.72 %). Carbendazim (at concentration of 0.1 %, 0.2 %, and 0.4 %) and Tricyclazole at (0.03 %, 0.06 %, and 0.12 %) were evaluated under field condition respectively. All the treatments proved effective and reduce leaf and neck blast intensity and significantly increased the yield. The best result was found with Tricyclazole in Vallabh-22 variety where 89.09 % disease incidence reduced in double of recommended dose while disease severity were maximum reduced (91.81 %) by Tricyclazole at the double of recommended dose. Tricyclazole and Carbendazim both were found to be reduced disease intensity/incidence and increased the yield. Best panicle growth (29.84 %) was observed when treated with double of recommended dose of Tricyclazole. P. jluorescens also found effective as it reduced the disease incidence (55.90% in Vallabh- 22 followed by 40.75% in PB-1121) and disease severity (54.68% in PB- 112~ followed by 50.51 % in PB-6) and increase in panicle length (22.40 % in Vallabh- 22 followed by 20.96 % in PB-6).