IDENTIFICATION OF POTENTIAL BIO-AGENTS, EVALUATION OF NEW MOLECULES AND SCREENING FOR RESISTANCE TO MITIGATE SHEATH BLIGHT OF RICE
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Date
2019
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Indira Gandhi Krishi Vishwavidyalaya, Raipur
Abstract
Rice (Oryza sativa L.) is most important crop among all the cereals that constitute the staple diet all over the world. In case of Asia rice is the largest growing cereal crop. Chhattisgarh state is popularly known as “bowl of rice” of the country; rice is grown as principal crop of this state and occupies 70 per cent of net sown area. Sheath blight of rice is second most economically important disease after blast. In tropical Asia, cultivation of rice under lowland condition cause average yield loss ranges between 5-10% and 5-20% in case of Chhattisgarh. Most common practice among farmers for the effective management of sheath blight is application of fungicide which is adopted worldwide. However it is necessary to evaluate or screen the new molecules of fungicides for the management of the disease very effectively. Fungicide molecules are hazardous to natural ecosystem an answer to this problem application of fungicides is replaced by use of bio-control agents which is more eco-friendly in the long term. For eco-friendly management of rice diseases host resistance is major tool and has played a major role in sustaining the production of rice. For effective management of sheath blight, development of resistant cultivar is a best approach as it required no extra cost to farmers and safe to environment. The present investigation was therefore undertaken with the evaluation and identification of potential bio-agents against Rhizoctonia solani. Confrontation assays involving 131 bio-agents (121 Pseudomonas fluorescens + 10 isolates of Trichoderma spp.) identified two potential fluorescent Pseudomonas (P86 and P74) and 10 isolates of Trichoderma spp. effective against R. solani. Two new molecules WCPL6060 and BAS 750 02 F along with reference fungicides were evaluated and were found effective in reducing the rate of disease development when the fungicidal applications were used as curative sprays. Seventeen rice genotypes were reevaluated for sheath blight resistance following artificial inoculation of which 14 expressed resistances.
Description
IDENTIFICATION OF POTENTIAL BIO-AGENTS,
EVALUATION OF NEW MOLECULES AND
SCREENING FOR RESISTANCE TO MITIGATE
SHEATH BLIGHT OF RICE
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