National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
The efficacy of some combination fungicides like fenamidone 10% + mancozeb 50% WDG, metiram 55% + pyraclostrobin 5% WG and cymoxanil 8% + mancozeb 64% WP along with commonly used fungicides viz., dimethomorph 50% WP, fosetyl Al 80% WP, mancozeb 75 WP, metalaxyl 8% + mancozeb 64% WP, captan 70% + hexaconazole% WP and carbendazim 25% + mancozeb 50% WS were tested against early blight of potato cv. kufri pukhraj at Agricultural Research Station, Ladol and Potato Research Station, Deesa, S. D. Agril. University, Gujarat during 2015-16 to 2017-18. A variant with no application of fungicide was used as a control. All the treatments reduced the disease intensity significantly as compared to untreated check. The data on PDI of early blight of potato was recorded periodically at 50, 60 and 70 days after sowing with consecutive three spray of fungicides at 15 days interval and was found low to moderate in range (10.07–37.98 %). The lowest per cent disease intensity (PDI) 10.07 was observed in case of fenamidone 10% + mancozeb 50% WDG @ 0.2% treatment (2.5 gm/l) followed T8 spraying of metiram 55% + pyraclostrobin 5% WG @ 0.2% (2 gm/l) and T2 spraying of cymoxanil 8% + mancozeb 64% WP @ 0.25% (2.5 gm/l) with its PDI at par values. It significantly reduced the early blight as compared to control. Similarly, the highest yield of potato tubers was also recorded in T1 spraying of fenamidone 10% + mancozeb 50% WDG @ 0.2% (2.5 gm/litre) against early blight with 51661 kg/ha followed by metiram 55% + pyraclostrobin 5% WG @ 0.2% (2.0 gm/litre) and cymoxanil 8% + mancozeb 64% WP @ 0.2% (2.5 gm/litre) with its yield 49309 and 48984 kg/ha, respectively. Thus, it can be said that combination of systemic and contact fungicides effectively suppressed pre- as well as post-infection activity and inhibited sporulation and/or restricted lesion expansion of early blight pathogen. Also found increase in the yield of potato as well.
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