Effect of different levels of nitrogen fertilizer, leaf removal and a fungicide treatments on bunch rot disease of grapes [electronic resource].

Includes references.

Two field trials with 10 years old grapevines c. v. Red globe (seeded cultivar) were conducted during 2003 and 2004 at Menia governorate, Egypt. In these trials, treatments consisted of N1 at 30 unit of Nitrogen (Amonium sulphate), N2 at 45 N unit, N3 at 60 N unit, N4 at 75 N unit , N5 at 90 N unit and control (without adding N) were applied to determinate the effect of different levels of Nitrogen on bunch rot disease incidence and severity. An additional trial was to compare the leaf removal treatment with non managed control. All plots were established in a split-plot design with or without using fungicides. The above mentioned treatments were applied during each growing season starting at full bloom till version stage (the beginning of ripening) in order to control bunch rot disease. The obtained results showed that incidence and severity of bunch rot disease were significantly reduced when the treatment of nitrogen fertilizer 30 N unit was used while the high levels of nitrogen fertilizer increased incidence and severity of the bunch rot. Leaf removal also reduced disease incidence and severity in nonsprayed control compared with the in tact nonsprayed control. The highest reduction in disease incidence and severity was in the treatments with three sprays of fungicide Euparen M at bloom, pre-close and version stages. Also, the produced fruit yield from treated vines was significantly higher during the first and the second seasons In comparison with that of untreated vines.

Summary in Arabic.

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