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“STUDY ON Sclerotium rolfsii Sacc. CAUSING COLLAR ROT OF CHICKPEA”

KrishiKosh

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Title “STUDY ON Sclerotium rolfsii Sacc. CAUSING COLLAR ROT OF CHICKPEA”
M.Sc. (PLANT PATHOLOGY)
 
Creator Tripathi, Brajeshwar Prasad
 
Contributor Khare, N.
 
Subject Sclerotium rolfsii Sacc., COLLAR ROT, CHICKPEA
 
Description Chickpea is cultivated throughout the state of Chhattisgarh, but the average yield of chickpea is very low. One of the reason for poor yield is the negligence in the adoption of plant protection measures against pests & diseases. The collar rot disease of chickpea caused by Sclerotium rolfsii is soil borne and fast spreading, which cause considerable damage to the plant stand. Considering the importance of collar rot disease the present investigation entitled “Study on Sclerotium rolfsii Sacc. causing collar rot of chickpea” was carried out at the Department of Plant Pathology, I.G.A.U., Raipur (C.G.).
In pathogenicity 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 of Sclerotium rolfsii was obtained with Trichoderma spp. (PSR) followed by Trichoderma harzianum (Kanpur) and Trichoderma spp. (MBR). In pot culture, most effective species of Trichoderma were Trichoderma viride (Kanpur) and Trichoderma harzianum (Kanpur) against Sclerotium rolfsii as they increased the per cent germination of seeds and minimized the pre and post-emergence mortality over control.
Potato dextrose agar media was best for the radial growth of S. rolfsii. followed by chickpea meal media. The best growth of fungus was observed at 300C followed by 350C. The pathogen was able to grow at a 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 plants leaf extract were evaluated under in vitro condition. The radial growth of S. rolfsii was significantly less in leaf extract of Aswagandha followed by Vantulsi.
92 genotypes were screened for their resistance to collar rot disease. Out of these 3 genotypes found to be moderately resistant, one was moderately susceptible, four were susceptible and remaining 84 genotypes were highly susceptible to this disease.
Complete inhibition of mycelial 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.
 
Date 2016-09-21T12:44:27Z
2016-09-21T12:44:27Z
2004
 
Type Thesis
 
Identifier 129p.
http://krishikosh.egranth.ac.in/handle/1/78001
 
Language en
 
Format application/pdf
 
Publisher INDIRA GANDHI KRISHI VISHWAVIDYALAYA, RAIPUR