Глобальный журнал биологии, сельского хозяйства и медицинских наук

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EFFECTS OF VARIETY, NITROGEN FORM AND APPLICATION TIMMING OF FUNGICIDE ON EARLY BLIGHT DISEASE ON TOMATO

Abbo Azza Siddig, Idris Mohamed Osman, ElBalla Mustafa Ali

The effect of tomato variety (open-pollinated and hybrid), nitrogen form (urea and ammonium nitrate) and the application time of the fungicide Ridomil Gold® MZ 68% on early blight disease of tomato was evaluated. A field trial was conducted for three consecutive growing seasons (2006/07, 2007/08 and 2008/09). In the growing seasons, early blight symptoms showed up naturally 12 weeks after sowing. The application of the fungicide at the onset of the disease significantly (P ≤ 0.05) reduced disease incidence and increased tomato yield. Regarding disease incidence; the combination of the hybrid variety (Star 9008), use of ammonium nitrate fertilizer as a source of nitrogen and application of Ridomil Gold at the onset of the disease was significantly (P ≤ 0.05) superior to all other combinations included in the experiment.