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“STUDIES ON MYROTHECIUM LEAF SPOT (Myrothecium roridum) Tode ex Fries. OF SOYABEAN”

KrishiKosh

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Title “STUDIES ON MYROTHECIUM LEAF SPOT (Myrothecium roridum) Tode ex Fries. OF SOYABEAN”
M.Sc. (PLANT PATHOLOGY)
 
Creator Talukdar, Diganggana
 
Contributor Dantre, R.K.
 
Subject MYROTHECIUM LEAF SPOT (Myrothecium roridum) Tode ex Fries., SOYABEAN
 
Description The present investigation entitled “Studies on Myrothecium Leaf Spot (Myrothecium roridum) Tode ex. Fries. of Soyabean” was carried out at the Department of Plant Pathology, IGKV, Raipur (C.G.). Myrothecium Leaf Spot is very destructive disease of soyabean caused by Myrothecium roridum .
Pathogen was derived from the infected leaf and culture was maintained in PDA media and pathogenicity of fungus was conducted in leaf by attached and detached method as well as in seed and Koch‟s postulates confirmed. Typical symptom developed first on leaf then spread to stems and pod. Out of seven media, maximum radial growth was recorded in PSA followed by Malt extract and PDA and sporulation was highest in malt extract. The most suitable PH for mycelial growth of Myrothecium roridum was at PH 6 and 250C temperature. Influence of culture filtrate of Myrothecium roridum on enzymatic activity of CMC and PG was given maximum % loss of viscosity in culture filtrate in CMC and PG at 7 PH. The seed germination was minimum (42%) and post seed mortality was maximum (100%) in without surface sterilized and inoculated treatment. Culture filtrate play important role in development of disease on leaf and seed. When use of culture filtrate in attached leaf of soyabean necrosis and browning appeared after 6 days. Leaf scratch method was most suitable for disease development in detached method as symptoms of uniform browning appeared after 3 days of inoculation. By standard blotter method there was total mortality of 85 % in treated seed, 90 % in blotter treated and 100 % in seed and blotter treated. Germination percentage in control was 87%. The 100 % pure concentration of culture filtrate was most effective for macerating of vegetable pith.
The maximum inhibition of radial growth of the fungus was in neem (93.21%) followed by onion (92.11%) and lemon (90.40%) and minimum in extract of tulsi (69.64
%). In fungicides treatment Benomyl, Saaf and Vitavex power proved to be most effective in inhibiting the mycelial growth of the fungus. Trichoderma isolates T31 followed by T7 was most effective against Myrothecium roridum.Out of 56 varieties of soybean screened, 50 varieties showed highly resistant, 6 varieties showed moderately resistant.Maximum disease severity was recorded in late sown crop i.e. 24/8/10. Maximum disease severity was recorded in variety JS-9035 (15.22) followed by JS-335(10.56) and lowest in JS-9752.Percent disease index increases with increased in maximum temperature, rainfall and humidity. So PDI is positively correlated with maximum temperature, rainfall and maximum relative humidity.
 
Date 2016-09-22T11:28:23Z
2016-09-22T11:28:23Z
2011
 
Type Thesis
 
Identifier 152p.
http://krishikosh.egranth.ac.in/handle/1/78324
 
Language en
 
Format application/pdf
 
Publisher INDIRA GANDHI KRISHI VISHWAVIDYALYA, RAIPUR