Morpho-cultural variability and management of Colletotrichum capsici (Sydow) causing leaf spot disease of turmeric (Curcuma longa L.)
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Date
2023
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RPCAU, Pusa
Abstract
Turmeric crop suffers very badly due to Colletotrichum capsici causing leaf spot disease in terms of both quantitative and qualitative losses across India and world. Especially in rainy season under humid condition, it affect the crop severely. Therefore, the current study was undertaken on Morpho-cultural variability and management of Colletotrichum capsici involving different culture media adjusted at different pH and at different temperature. In in vitro management of C. capsici, six different aqueous plant extracts and fungicides was used.
In study of colony characters of different isolates of pathogen: different colour, shape, elevation with different type of margin and texture were observed under study. The interaction effect on mycelial growth of all three isolates on PDA media was found significant. However, the max. mycelial growth of 77.00 mm was recorded in isolate, V3 on 8th day. The interaction effect on mycelial growth of all three isolates on CDA media was found non-significant. However, the max. mycelial growth of 90.00 mm was recorded in isolate V2 and V3 on 8th day. Irrespective of isolates, statistically significant max. mycelial growth of 89.33 mm was found on 8th day followed by 79.83 on 6th day respectively. In interaction effect of different isolates at different time interval in RSA media, max. mycelial growth of 90.00 mm followed by 81.50 were found in isolate V3 on 8th and 6th day respectively.
At 5 per cent conc., min. mycelial growth of pathogen (35.33 mm) followed by 49.33 mm and consequently 60.74 and 45.19 per cent inhibition in pathogen growth over absolute check was recorded in culture media amended with aqueous extract of Ashoka and tobacco respectively. Irrespective of botanicals used, min. mycelial growth was observed at 15% conc. followed by 10% conc. and both of these conc. was found to be statistically significant in their effect. At 100 ppm, no mycelial pathogen growth was observed in ready mixture of Azoxystorbin 7.1% SC + Propiconazole 11.9% SC (Azoxy P) followed by Propiconazole 25% SC (Tilt). Here, both treatments were found to be statistically significant in their effect. At 250 ppm conc., no mycelial growth was found in ready mixture of Azoxystorbin 7.1% SC + Propiconazole 11.9% SC (Azoxy P) and Propiconazole 25% SC (Tilt) used as standard check, followed by Hexaconazole 5% EC (Contaf). These treatments were found statistically significant in their effect in supressing pathogen growth. At 500 ppm conc., no mycelial growth was observed in ready mixture fungicide, Azoxystorbin 7.1% SC + Propiconazole 11.9%SC (Azoxy P), Propiconazole 25% SC (Tilt) used as standard check and Hexaconazole 5% EC (Contaf) followed by ready mixture of Azoxystorbin 11% SC + Tebuconazole 18.3% SC (Suzuki). Irrespective of fungicides used, min. mycelial growth of pathogen was observed at 500 ppm conc. followed by 250 ppm conc. and effect of both the conc. on pathogen growth were found statistically significant. In interaction effect of different fungicides, no growth of pathogen was observed in ready mixture fungicide of Azoxystorbin 7.1% SC + Propiconazole 11.9%SC (Azoxy P) at all conc., used. Propiconazole 25% SC (Tilt) used as standard check at 250 ppm and 500 ppm and Hexaconazole 5% EC (Contaf) at 500 ppm followed by ready mixture of Azoxystorbin 11% SC + Tebuconazole 18.3% SC (Suzuki) and all these treatments were found statistically significant, over absolute check in their effect.