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Paper Details

Management of Rhizoctonia root rot of pea (Pisum sativum L.) by integrated biological and chemical approach


Journal Title:International Journal of Agricultural Sciences

An experiment was conducted to assess the efficacy of Trichoderma isolates (Th-14 and Th-21) alone and/or in combination with the fungicide Topsin-M against pea root rot caused byRhizoctonia solani Kuhn (R-15) under both in vitro and in vivo conditions. Both the Trichoderma isolates inhibited mycelial growth of R-15 in paired culture method. The compatibility of both the systems (Trichoderma and Topsin-M) was also evaluated for successful integration of biological and chemical methods for controlling Rhizoctonia root rot of pea. The growth of Trichoderma isolates were not effected by Topsin-M even at concentration of 600 mg/l. Whereas, the growth of R-15 was significantly reduced even at concentration of 100 mg/l. Per cent germination, seedling survival (%), shoot and root dry weights were reduced in untreated plants in infested soil (check1). However, Plants obtained fromTrichoderma and/or Topsin-M treated seeds showed comparatively higher per cent germination, shoot and root dry weights. Reduction in root rot severity was more when seeds were treated with Trichoderma isolates alone or in combination with Topsin-M compared to Topsin-M alone. The population density ofR. solaniwas reduced significantly in the rhizosphere of pea seedlings obtained from seeds pretreated with Trichoderma and/or Topsin-M. Minimum CFU/g of R-15 was obtained from soil sample collected from the pot given T4 (Th-14+ Topsin-M+ R-15) treatment. Thus, the two systems (Th-14 and Topsin-M) showed a synergistic effect for controlling Rhizoctonia root rot of pea