comparing the efficacy of two copper fungicides in controlling peach leaf curl disease

Peach leaf curl disease, caused by taphrina deformans (berk.) tul., is one of the most serious peach diseases, causing quantitative and qualitative damage to crops across iran each year. in current study, the efficacy of two new fungicides, badge®wg280 and barzidox®wp85%, was evaluated in controlling peach leaf curl disease. the experiment was conducted in golestan, semnan and north khorasan using a randomized complete block design with ten treatments and four replications. treatments included 0.75, 1, and 1.2 ml l^-1 of badge®wg280 (copper hydroxid+copper oxychloride), 2, 4, and 6 g.l^-1 of barzidox®wp85% (copperoxychloride), 2.5 ml l-1 of nordox®wg75% (copperoxide(, 3 g l-1 of captan, and controls (with and without water spraying). treatments were applied at three physiological stages (the first in autumn after the leaves had fallen, the second at the end of march before the bud had swollen, and the third after the petals had dropped). disease incidence and severity percentage were determined. duncan's multiple range test was used to compare the mean disease severity and incidence percentages. the results showed that 6g l^-1 of barzidox® had the highest efficacy in reducing disease severity compared to the control in golestan and semnan provinces, with 81% and 80% respectively. furthermore, the best performance of two indicator fungicides, nordox® and captan were 73% and 72% in golestan province and 67% and 68%, in semnan province, respectively. according to the results, it is concluded that 1.2ml.l^-1 of badge® and 4g.l^-1 of barzidox® have the best efficiency in controlling the peach leaf curl disease.