دراسة مرض التقرح و الذبول البكتيري على الطماطة في بعض مناطق محافظتي كربلاء و بابل

الملخص EN

the persent study was conducted to determine the occurrence and spread of bacterial Canker and wilt disease on tomato plants in some fields of Kerbala and Babylon provinces in addition to isolating the pathogenic agent and studying its identification, pathogenic ability and control.The results showed that the disease was spreading on the plants grown in all plastic houses involved in this survey.

The microscopic examination revaeld that the pathogenic agent is abacterium which accompanied all infected plants at all their stages of growth.

The highest mean of infection rate in 2008-2009 growing season was 12% in the plastic houses in Babylon province ( Al-Hamah district ) while it reached its lowest level ( 5% ) in Al-Mahaweel district belonging to the same province.

The mean in the same style of farming in kerbala province was 5%.There was no infection at all in open-field farming in both provinces .

The pathogenic ability of the bacterial isolates was examined and confirmed by applying the test of hypersensitivity on tobacco leaves ( var.xanthi ).

The bacterium was identified based on the microscopic, morphological, and biochemical characteristics in addition to the growth of the bacterium in some of the selective and differentiative mediums and also to its ability to consume some organic acids and alcohols.

all these characteristics proved that this bacterium is Clavibacter michiganense michiganense.

the bacterial filtrate of Bacillus subtilis, the bactericide Beltanol and the antibiotic Agromycin showed to be effective against Cmm compared with the control treatment in both of laboratory and plastic house conditions.