عزل و تشخيص انواع الفطر Fusarium من أنواع مختلفة من الترب في محافظة البصرة و اختبار قابليتها المرضية

Abstract EN

This study was conducted at the laboratories of the College of Agriculture, University of Basrah from April 2016 to July 2017.

The study aimed to isolate and diagnose Fusarium spp.

, from Shatt Al Arab, Abu Al Khasib, Qurna, Kerma Ali, Safwan, Al Madinah and Al-Saiba within four seasons fourteen were species isolated from the different regions, two species were isolated for the first time in Iraq.

They are F.

musarum and F.

sambucinum.

Eleven species were isolated by dilution method, while 3 species were isolated from the plant debris in the soil.

The pathogenicity of Fusarium spp.

was also tested on radish seeds in Petri dishes on PDA.

The results showed that the fungus F.

sporptrichoides was the least pathogenic among the other species in this experiment, giving a radish seed germination rate of 66.67% compared to control treatment with germination rate of 86.67% and the most pathogenic fungus was F.

colmurum which caused damping- off in a percent of in a percent of 90% compared to control treatment, which gave a death rate of 13.33% .

The results also showed that the exudate of F.

nygamai, gave a germination rate of 83.33% compared to the control treatment which had a germination rate of 96.67% while the exudate of F.

colmurum gave highest percentage of damping-off reached to 76.67% compared to the control treatment which gave a damping-off in a percent of 3.33% .

The research is a part of Msc Thesis of the first other.