Investigations on fungicidal sensitivity of trichoderma spp and sclerotium rolfsii (collar rot pathogen) in crossandra.
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Date
2011-04
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Abstract
Crossandra is an important flower plant of our country earning a lot of revenue
and trade. Of different diseases affecting crossandra cultivation, collar rot induced by
Sclerotium rolfsii Sacc. is an important soil borne disease causing devastating losses. In the
present study, the sensitivity of the collar rot pathogen was investigated. Also the compatibility
of fungal biocontrol agent, Trichoderma spp. with these fungicides was worked out to for
further devising Integrated Management strategies for collar rot disease. Four fungicides, viz.,
captan 50% WP, propiconazole 25% EC, thiophanate-methyl 70% WP and thiram 75% SD were
evaluated at five different concentrations against collar rot pathogen, S. rolfsii. Further, the
compatibility of these fungicides and the antagonist Trichoderma isolate-1 (T1). Results
indicated that the fungicides, propiconazole, thiram and captan have significantly reduced the
mycelial growth of test pathogen over control. Maximum inhibition was with propiconazole
(100%), followed by thiram (81%) and captan (78%). Results on compatibility of Trichoderma
spp. with these fungicides revealed that the bioagent was highly compatible with thiram (32%
growth inhibition), followed by captan (47.5%). However, the Trichoderma isolate is not
compatible with thiophanate methyl (88% growth inhibition) and propiconazole (100% growth
inhibition). The Trichoderma isolate-1 (T1) and the fungicide, thiram were selected for further
studies to devise integrated management strategies against collar rot disease.
Description
Keywords
Crossandra, Collar Rot, Sclerotium rolfsii, Trichoderma and fungicidal compatibility
Citation
Arunasri P, Chalam T V, Reddy N P Eswara, Reddy S Tirumala, Reddy B Ravindra. Investigations on fungicidal sensitivity of trichoderma spp and sclerotium rolfsii (collar rot pathogen) in crossandra. International Journal of Applied Biology and Pharmaceutical Technology. 2011 Apr-June; 2(2): 290-293.