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Studies on anathracnose of sorghum caused by Colletotrichum graminicola (Ces.) Wilson

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Title Studies on anathracnose of sorghum caused by Colletotrichum graminicola (Ces.) Wilson
 
Creator P.G.Narendra Kumar
 
Contributor Y.D.Narayana
 
Subject Plant Pathology
 
Description most important foliar fungal disease. The roving survey was carried out during kharif 2005 in
Dharwad, Gadag, Belgaum and Haveri districts of Karnataka. Anthracnose of sorghum was
more prevalent in Dharwad (46.00%) followed by Belgaum (42.26%). Dharwad taluk
(54.00%) is considered as a “hot spot” for anthracnose disease.
Cultural studies revealed that among solid media tested, synthetic media like
Tochinal’s agar and Sabouraud’s agar and non-synthetic media like oat meal agar and
sorghum seed extract agar were found good for growth and sporulation of C. graminicola.
Physiological studies revealed that optimum temperature of 30°C was favourable for
the growth (73.62 mm) of C. graminicola. Maximum dry mycelial weight was obtained at pH
7.0 (414.75 mg). Alternate cycles of 12 h light and 12 h darkness favoured the growth (70.28
mm) and sporulation of C. graminicola. Among the relative humidity levels tested, 100
percent relative humidity was best for spore germination (91.50%) of C. graminicola.
Sorghum growth stages tested for susceptibility to anthracnose development. Plants
were highly susceptible at eight leaf stage (80.00%) as compared to four and two leaf stages.
In-vitro evaluation of fungicides indicated that systemic fungicides, carboxin at
concentration of 0.05%. Carbendazim and propineb at concentration of 0.1 percent and non
systemic fungicides, captan and iprodione at concentration of 0.1% were found effective in
inhibiting the growth of C. graminicola
Among the screening techniques tested to identify resistance sources of sorghum
genotypes to anthracnose disease, conidial spray inoculation (70.17%) was more effective
than whorl inoculation with infected grains (46.85%) and detached leaf technique (53.85%).
Of the 142 genotypes evaluated under natural conditions, 41 genotypes were highly
resistant, 36 were resistant, 20 were moderately resistant, 25 were susceptible, and 20 were
highly susceptible to anthracnose disease.
 
Date 2016-10-24T19:08:59Z
2016-10-24T19:08:59Z
2006
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/81662
 
Format application/pdf
 
Publisher UAS, Dharwad