تأثير الشد الرطوبي على الإصابة بالذبول الفرتسليومي على الزيتون

الملخص EN

The study was conducted on olive wilt disease caused by Verticillium dahliae Kleb , which was recently distributed in Iraq and considered one of the most important and devastating diseases on olive trees in Iraq.

Results of the field survey carried out in certain regions of Ninevah province during the years 2004 and 2005 , showed that the highly disease incidence and severity was found in Alsada region in 2005 which reached 48.72% and 0.29 while the lowest values was recorded in Khorsybad and reached 30.14% and 0.26, respectively.

Among the four water potential values (0.3 , 4 , 8 and 12 bars) used ,we found that the fourth treatment (12bars) was the most effective in reducing the disease severity and incidence in infected branches and reached 0.18 and 6.26% with Nebali cultivar and 0.19 and 9.72% with Sorani cultivar and significantly increased the length of the root system which reached 45.5cm .