Low Carbohydrate Content in the Roots of Citrus as an Indicator of Being Infected with Dry Root Rot Disease Caused by Fusarium solani in Northwestern Libya

الملخص

Abstract

The field survey on the dry root rot disease of citrus trees of citrus –growing areas in several regions of northwestern Libya from Misrata to Zawia, showed spread of the disease in all areas of this study associated with the presence of Fusarium solani in infected citrus plants.The study found significant differences in impact on the carbohydrate contents of roots of seedlings infected with different isolates of F. solani. isolates, F4 and F5 have the highest effect on the root contents of sugars. Also the fungus numbers were higher in the rhizosphere.