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“STUDIES ON AERIAL BLIGHT OF SOYBEAN CAUSED BY Rhizoctonia solani Kühn”

KrishiKosh

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Title “STUDIES ON AERIAL BLIGHT OF SOYBEAN CAUSED BY Rhizoctonia solani Kühn”
M.Sc. (PLANT PATHOLOGY)
 
Creator Kumar, Tikendra
 
Contributor Dantre, R.K.
 
Subject planting, diseases, transgenics, genes, biological phenomena, groundnuts, genetic processes, fungi, transgenic plants, pcr
 
Description The present investigation entitled “Studies on aerial blight of soybean caused by Rhizoctonia solani Kühn” was conducted at the Department of Plant Pathology, Indira Gandhi Krishi Vishwavidyalaya, Raipur (C.G.). The R. solani was isolated and pathogenicity was proved by detached method. R. solani was survived through sclerotia, leaves and roots over a tested period i.e., 300 days. In case of sclerotia fungus was survived in all conditions while in leaves fungus was survived in irrigated condition and in case of root at room temperature, fungus was survived only in upper part (collar region).
Under in vitro study complete inhibition in mycelial growth of R. solani was observed by Benlate and Cursor at all concentration i.e., 250, 500, 1000 ppm.
Out of fifteen medicinal plants leaf extracts, studies, the extract of Butch significantly inhibited the mycelial growth of Rhizoctonia solani under in vitro conditions. Among the medicinal oils, Eucalyptus and Neem oils were found to significantly inhibit the mycelial growth of Rhizoctonia solani at 5% concentrations.
Among the antagonists, maximum mycelial growth inhibition was observed by Trichoderma harzianum (74.81%) followed by Trichoderma viride (67.40%) while Trichoderma spp. (mushroom isolates) was least effective against Rhizoctonia solani.
Animal wastes are studies to find out their efficacy against Rhizoctonia solani at different concentration under in-vitro condition. Cow urine was found effective to inhibit mycelial growth of the R. solani. Among the ITK, maximum percent reduction of associated seed borne mycoflora was recorded in Cow urine of 2yrs and 3yrs old. 2yrs old Cow urine found effective to enhance the radical length. Germination of seed was not affected by Cow urine as well as Cow matha.
Forty-two entries screened for resistant to aerial blight of soybean, 2 entries (SL 752 and RKS 48) were found absolutely resistant and 6 entries were highly resistant. Soybean crop sown at 29th July showed least disease severity (11.04%) in comparison to 21st June, 9th July and 19th July sowing.
Losses assessment study revealed that maximum per cent reduction in seed weight, plant height, pods and branches were recorded in 9 score plants (more than 50% leaf area infected) i.e., 55.55%, 40.90%, 71.42%, and 72% respectively. Maximum aerial blight intensity was recorded in the crop sown in flooded field.
 
Date 2016-09-21T14:55:45Z
2016-09-21T14:55:45Z
2008
 
Type Thesis
 
Identifier 124p.
http://krishikosh.egranth.ac.in/handle/1/78090
 
Language en
 
Format application/pdf
 
Publisher INDIRA GANDHI KRISHI VISHWAVIDYALAYA, RAIPUR