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Gupta R.C.,National Horticultural Research and Development Foundation NHRDF | Purushottamn S.,Regional Research Station | Pandey S.,Regional Research Station | Gupta R.P.,National Horticultural Research and Development Foundation NHRDF
Pestology | Year: 2013

The field trial was conducted on onion variety Agrifound Dark Red for the management of foliar diseases through preventive spray of fungicides during Kharif, 2010, 2011 and 2012 at Regional Research Station of NHRDF, Karnal, Haryana. The efficacy of systemic and contact fungicides namely Carbendazim+Mancozeb, mancozeb, propineb, chlorothalonil, azoxystrobin, propiconazole, tebuconazole and hexaconazole were tested against foliar diseases of onion viz., stemphylium blight, purple blotch and colletotrichum blight. The pooled data of three years revealed that the lowest stemphylium blight intensity (7.78%) was recorded in preventive sprays of mancozeb @ 0.25% and propiconazole @ 0.1% (7.89%) at 75 days after transplanting. The highest gross yield (177.99 q/ha) and marketable yield (170.16 q/ha) were also recorded in preventive spray of mancozeb @ 0.25% followed by propiconazole @ 0.1% with gross yield (168.36q/ha) and marketable yield (165.88q/ha). The highest stemphylium blight intensity (14.32% & 13.95 %) as well as lowest gross (123.46 & 115.03 q/ha) and marketable yield (114.32 & 106.66 q/ha) was recorded in untreated check and controls with water spray only respectively. The higher cost benefit ratio (1:35.08) was recorded in preventive spray of mancozeb @ 0.25%. The pooled data were revealed that purple blotch and colletotrichum blight disease did not appear during the entire cropping period of onion. The study revealed that preventive sprays of mancozeb @ 0.25% and propiconazole @ 0.1% started after twenty days of transplanting and subsequently repeated at ten days intervals was adjudged better for the management of foliar diseases and increasing yield of onion during Kharif in Karnal region of Haryana.

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