Vol. 7, Issue 6 (2019)
Evaluation of the efficacy of new molecules in the management of sheath blight disease of rice
Author(s): NK Toorray, PK Tiwari and AS Kotasthane
Abstract: The six fungicides were taken under the study were Azoxystrobin 18.2% + difenoconazole 11.4% SC (Amistar top 32.5% SC), Azoxystrobin 18.2% + difenoconazole 11.4% SC, Azoxystrobin 18.2% + difenoconazole 11.4% SC, Azoxystrobin 18.2% + difenoconazole 11.4% SC, Azoxystrobin 23% SC (Amistar 25% SC), Difenoconazole 25% EC (Score 25% EC), Kitazin 48% EC (Kitazin 48% EC), Iprodione 25% + carbendazim 25% WP (Quintal), Hexaconazole 5% EC (Contaf 5% EC), with Untreated control under in vitro, pot and field conditions. In vitro evaluation shows that complete inhibition of growth of R. solani by new molecule Azoxystrobin 18.2% + Difenoconazole 11.4% SC 0.75ml dose/liter, Azoxystrobin 18.2% + Difenoconazole 11.4% SC 1.0 ml, Azoxystrobin 18.2% 1.0 ml, Difenoconazole 0.5 ml (Fig. in plates). Whereas Azoxystrobin 18.2% + Difenoconazole 11.4% SC at 1.25 ml and Azoxystrobin 18.2% + Difenoconazole 11.4% SC 2.5 ml, Kitazin 48% 2.0ml, Iprodione 25%z+Carbendazim 25% WP and Hexaconazole 5% EC showed some reduction in inhibition of R. solani. Even inhibition by Azoxystrobin 18.2% + Difenoconazole 11.4% SC at 2.5 ml was significantly higher than Azoxystrobin 18.2% + Difenoconazole 11.4% SC 1.25 ml followed by Iprodione 25%z+Carbendazim 25% WP, Kitazin 48%, Hexaconazole 5% EC, respectively. Hexaconazole 5% EC was found to be least effective among different chemicals. The pooled data for both the years od pot conditions presented in Table 12.6 indicated that the test combination fungicide (azoxystrobin 18.2% + difenoconazole 11.4% SC) was found highly effective against rice sheath blight disease at all the four concentrations tested when compared to the untreated control, wherein the severity was at the maximum (41.57%). There was significant difference among the treatments with respect to sheath blight incidence. Lowest disease severity was recorded with Azoxystrobin18.2% + difenoconazole 11.4% SC @ 1.0 ml (16.23%) followed by 0.75 ml/l (17.97%) and significantly different from the standard recommended fungicide, hexaconazole 5% EC @ 2.0 ml/l (25.25%). Azoxystrobin18.2% + difenoconazole 11.4% SC @ 2.5 ml/l (18.18%), difenoconazole 25% EC @ 0.5 ml/l (18.88%) and azoxystrobin 23% SC @ 1.0 ml/l (20.99%) were also recorded significantly lower sheath blight incidence when compared to untreated control where the disease incidence was 41.57%. Iprodione + carbendazin 50% WP and Kitazin 48% EC were also recorded significantly lower disease severity which recorded 23.41% and 25.02% disease respectively. The pooled data for both the years of field conditions presented in Table 12.7 indicated that the test combination fungicide (azoxystrobin 18.2% + difenoconazole 11.4% SC) was found highly effective against rice sheath blight disease at all the four concentrations tested when compared to the untreated control, wherein the severity was at the maximum (40.74%). There was significant difference among the treatments with respect to sheath blight incidence. Lowest disease severity was recorded with Azoxystrobin18.2% + difenoconazole 11.4% SC @ 1.0 ml (18.10%) followed by 0.75 ml/l (18.51%) and significantly different from the standard recommended fungicide, hexaconazole 5% EC @ 2.0 ml/l (26.15%). Azoxystrobin18.2% + difenoconazole 11.4% SC @ 2.5 ml/l (19.18%), difenoconazole 25% EC @ 0.5 ml/l (20.37%) and azoxystrobin 23% SC @ 1.0 ml/l (21.51%) were also recorded significantly lower sheath blight incidence when compared to untreated control where the disease severity was 40.74%. Iprodione + carbendazin 50% WP and Kitazin 48% EC were also recorded significantly lower disease severity which recorded 24.46% and 25.90% disease respectively.
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How to cite this article:
NK Toorray, PK Tiwari, AS Kotasthane. Evaluation of the efficacy of new molecules in the management of sheath blight disease of rice. Int J Chem Stud 2019;7(6):250-258.
