وبائية تعفن التاج و جذور الطماطة الفيوزارمي المتسبب عن Fusarium oxysporum f. sp. radicis lycopersici Jarvis and Shoemaker

Abstract EN

Field survey conducted during 2005 and 2006 at Al – jazeera project (Rabbia), showed the prevalence of tomato Fusarium crown and root rot (FCRR), which is characterized by a chocolate – brown internal discoloration of the roots after 5 week of transplanting .

Wilting symptoms developed after 8th week (fruiting stage), under highly temperature conditions in July contradictory as known that the cold weather was favorable to the pathogen .The rate of infection (r) was developed according to plant growth progress, most plants were collapsed throughout 8-12 week , since the pathogen colonized the epidermis and root cortex tissues.

The (r) values were actually decreased during the harvesting stage after 12-16 week of transplanting