Evaluation of fungicides for controlling downy mildew of onion under field conditions
2008
Raziq, F. (NWFP Agricultural Univ., Peshawar (Pakistan). Dept. of Plant Pathology) | Alam, I. (NWFP Agricultural Univ., Peshawar (Pakistan). Dept. of Plant Pathology) | Naz, I. (Agricultural Research Inst., Peshawar (Pakistan). Plant Pathology Section) | Khan, H.
Efficacy of ten fungicides, viz. Aliette, Antracol, Benlate, Cobox, Daconil, Derosal, Dithane, Polyram, Ridomil and Topsin-M, was tested at Tarnab Farm, Peshawar, in 2006 against a destructive disease of onion, downy mildew caused by Peronospora destructor Berk. Each of the fungicides was sprayed three times at an interval of 10 days following appearance of the disease symptoms. All the fungicides were found to be effective in controlling the disease. Ridomil was the most effective in reducing the disease severity and enhancing yield, followed by Topsin-M, Aliette and Antracol. Sprays with Ridomil also resulted in the least number of dead plants, greatest plant height, most abundant leaves per plant, and largest number and weight of medium, large and total bulbs. The use of these fungicides is recommended in an integrated control strategy, incorporating other methods such as resistant varieties and prudent cultural practices.
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