MANAGEMENT OF COLLAR ROT OF BRINJAL CAUSED BY SCLEROTIUM ROLFSII SACC
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Date
2019
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Indira Gandhi Krishi Vishwavidyalaya, Raipur (C.G.)
Abstract
The present investigation entitled “Management of collar rot disease of brinjal caused by Sclerotium rolfsii Sacc.” was done in Department of Plant Pathology, College of Agriculture, IGKV, Raipur.
Collar rot disease is important one of the important disease of brinjal caused by Sclerotium rolfsii. The morphological and cultural growth characteristics were similar to Sclerotium rolfsii. Pathogenicity of Sclerotium rolfsii was tested through soil inoculation method.
Among the bioagents, Pseudomonas fluorescens (isolate12) showed highest inhibition (64.97%) against Sclerotium rolfsii. Therefore Pseudomonas fluorescens (isolate12) was selected for further study under in vivo condition. Four treatments were applied. Lowest disease incidence occurred with treatment- seedling dip treatment + soil application of Pseudomonas fluorescens (isolate12). Highest disease incidence occurred with treatment-seedling dip treatment with Pseudomonas fluorescens at half of the recommended dose.
Efficacy of five botanical extracts was tested against Sclerotium rolfsii at 5% and 10% concentrations. Out of them garlic extract was most effective at both concentrations. In vivo efficacy of four botanical extracts were tested against Sclerotium rolfsii at 10% concentration under in vivo condition. Out of them garlic extract was most effective to reduce collar rot disease incidence and ginger extract was least effective.
Efficacy of 6 fungicides was tested against Sclerotium rolfsii at three different concentrations - at half of the recommended dose, recommended dose and at 500 ppm more concentration than recommended dose. Out of them Tebuconazole 25% EC was most effective. Therefore Tebuconazole 25% EC was selected for studies under in vivo condition and four treatments were applied. Most effective treatment was - seedling dip treatment + soil drenching with Tebuconazole 25% EC at the time of transplanting. Highest disease incidence was recorded with treatment - seedling dip treatment with Tebuconazole 25% EC at half of the recommended dose.
Effect of age of brinjal plants on the susceptibility to collar rot disease under pot condition. Highest disease incidence was recorded in 15 days old plants. Least disease incidence was observed in age group of 60 days old aged plants. Therefore older plants were more resistant to collar rot than younger plants.
Screening of 66 different brinjal varieties for the resistance against collar rot disease was done under naturally infected field condition in horticulture field as per standard evaluation system. Among them 45 varieties were resistant, 18 were moderately resistant and 3 were moderately susceptible.
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