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International Journal of Plant Pathology
Year: 2011  |  Volume: 2  |  Issue: 2  |  Page No.: 81 - 88

Evaluation of Bioagents against the Infection of Green Mould (Trichoderma spp.) in Pleurotus sajor-caju Cultivation

Shaiesta Shah and Sahera Nasreen    

Abstract: The aim of the present study was to check the efficacy of various bioagents against green mould (Trichoderma spp.) associated with the Pleurotus spp. cultivation both in vitro and in vivo. Pleurotus specie commonly known as oyster mushroom or dhingri mushroom is one of the most important mushrooms cultivated in india. Four bioagents namely Pseudomonas fluorescence, Streptomyces sp., Bacillus cereus and Bacillus subtilis (3 isolates., Bs-I, Bs-II and Bs-III) were screened against all Trichoderma spp. (T. harzianum, T. viride and T. pseudokoninjii) and Pleurotus in vitro. Antifungal efficiency was examined by streaking method. The percent inhibition produced by bioagents against Trichoderma spp. recorded was: P. fluorescence (35.2 to 41.8%), Streptomyces sp., (12.3 to 30.8%), Bacillus cereus (16.9 to 30.5%), Bs-I (35.1 to 40.9%), Bs-II (36.1 to 44.3%) and Bs-III (42.1 to 51.1%), respectively. Bacterial antagonists showing maximum inhibition against the pathogen and minimum inhibition against mushroom were further evaluated against the Trichoderma sp. in in vivo test in mushroom house. For in vivo test, sterilized lignite inoculated with the bacterial cultures of P. fluorescence, B. subtilis (Bs-I and Bs-II) was thoroughly mixed with the paddy straw substrate at 1, 2 and 3% concentrations, followed by the inoculation of 3 mL spore suspension of Trichoderma at the rate of 1x103 spores mL-1. All tested antagonists produced more yield and reduced the disease intensity than control. The treatments which receive Bs-II as bioagent show maximum increase in yield (25.32 %) and minimum disease incidence (5.7%) at 3% concentration.

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