Bioefficacy of Pyraclostrobin 25%EC Against Early Blight of Tomato
نویسنده
چکیده
Pyraclostrobin 25%EC at., 50, 75 and 100ga.i/ha, was evaluated for two seasons against early blight of tomato cultivar NS2535. The efficacy of pyraclostrobin was compared with commonly used chemicals viz., captan, mancozeb and an untreated control. Phytotoxicity effect of pyraclostrobin was evaluated using a single spray, at concentrations of 100, 200 and 400gm a.i/ha Pyraclostrobin at all concentrations was found significantly effective in reducing the disease and in increasing the yield as compared to captan, mancozeb and control. In the first season, pyraclostrobin treated plots recorded a PDI ranging from 10 to 15.5 and an yield of 29.8 to 33.1 tons/ha as compared to a PDI of 30 and yield of 8.925 tons/ha in control. In the second season, pyraclostrobin treated plots recorded a PDI ranging from 22.25 to 26.25 and an yield of 19.8 to 22.8tons/ha as compared to a PDI of 35.25 and yield of 17.725 tons/ha in control. Pyraclostrobin at 100, 200 and 400g a.i/ha did not cause any phytotoxicity symptoms in terms of chlorosis, necrosis, wilting, scorching, hyponasty and epinasty.
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