Studies on anathracnose of sorghum caused by Colletotrichum graminicola (Ces.) Wilson
KrishiKosh
View Archive InfoField | Value | |
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
|
|