Khare, U.K.Jayle, Shantanu T2016-07-282016-07-282014http://krishikosh.egranth.ac.in/handle/1/70177ABSTRACT Chickpea is cultivated throughout the state of Madhya Prades, but the average yield of chickpea is very low. One of the reason for poor yield is the nigligence in the adoption of plant protection measures against pests and diseases. The collar rot disease of chickpea caused by Sclerotium rolfsii is soil borne and fast spreading, which causes considerable damage to the plant stand. Considering the importance of collar rot disease the present investigation entitled “Studies on collar rot of chickpea caused by Sclerotium rolfsii Sacc.” was carried out at the department of Plant Pathology, College of Agriculture, JNKVV, Jabalpur. (M.P.) In pathogenecity test, the fungi S. rolfsii was found to be highly pathogenic as they reduced the germination and cause very high seedling mortality. Six antagonists were evaluated under in vitro conditions. Best inhibition Sclerotium rolfsii was obtained with Trichoderma spp. (PSJ) followed by Trichoderma harzianum (Indore) and Trichoderma spp. (MBJ). In pot culture, most effective species of Trichoderma were Trichoderma viride (Indore) And Trchoderma harzianum (Indore against Sclerotium rofsii as the increased the per cent germination of seeds and minimized the pre and post-emergence mortality over control. The best growth of fungus was observed at 300C followed by 350C. The pathogen was able to grow at wide range of pH from acidic to alkaline i.e. 4 to 9 pH but it grew best on pH 5 followed by pH 6. Eight medicinal plant leaf extract were evaluated under in vitro conditions. The radial growth of S. rolfsii was significantly less in leaf extract of Ashwagandha followed by Vantulsi. Complete inhibition of mycellial growth of S.rolfsii Sacc. was observed with Hinosan, Antracol, Mancozeb, Kitazin, Kavach, under in vitro evaluation of fungicides. These fungicides also increased seed germination and decreased pre and post-emergence mortality under pot culture technique.enThesis