Evaluation of the Efficacy of bordeaux mixture (SC 18%) on Controlling Apricot Shot Hole Disease Caused by Wilsonomyces carpophilus (Lev.) Adask., J. M. Ogawa & E. E. Butler

Shot hole disease caused by Wilsonomyces carpophilus is one of the most important diseases of apricot in the world and copper-based fungicides are usually used as the chemical control of this disease. New copper-based fungicide (Misho Bordeaux® SC 18%) contains Bordeaux mixture active ingredient. In the present study, its efficacy was compared with common fungicides including Bordeaux Fix SC 18%, copper oxychloride (Mishocap® WP 35%) and captan (Captan® WP 50%) for the control of shot hole disease on apricot. The experiment was carried out in Alborz (Savojbolagh), Semnan (Shahrood) and Kohgiloyeh and Boyerahmad (Yasuj) provinces in a randomized complete block Design (RCBD) with 8 treatments and 4 replications. Treatments included 5, 10 and 15 ml/L of Misho Bordeaux, Bordeaux Fix 15 ml/L, Mishocap 3 g/L, Captan 3 g/ L and controls (without any spraying and with water spraying). Fungicides were applied at two stages (the first spraying time was after fall of the leaves and the second one was at bud inflation). Disease incidence percentage and disease severity percentage were measured and analyzed in the three provinces. Mean comparison of disease severity and disease incidence percentages were done by Duncan's multiple range test ( =1%). The results show that there are significant differencesbetween all the fungicide treatments and the controls. Misho Bordeaux 15 and 10 ml/L had better control effects than the other treatments. Disease severity percentages in Alborz province were 4.27 and 4.35, in Semnan province were 7.00 and 9.25 and in Kohgiloyeh and Boyerahmad province were 3.67 and 4.70 respectively. Disease incidence percentages in trees sprayed by Misho Bordeaux 15 and 10 ml/L in Alborz province were 15.00 and 15.75, in Semnan province were 8.25 and 10.25 and in Kohgiloyeh and Boyerahmad province were 13.00 and 17.00 respectively.