الفهرس 
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Abstract
A severe head rot disease of Brassica oleraceae L.
Var.cpicota cultivar Kahira Hagin was encountered in the farms of Faculty of Agriculture, El-Minya University and Secondary School of Agriculture at El-Minya. The purpose of this investigation was to identify, to study the properties of, and to find some control measures against, the pathogenic organisn (s) .
Results could be summarized in the folloings :
1 - Ten bacteria were isolated from. ten naturally Infected
cabbage plants. According to morphological, physiological
and pathological characters they could, be classified into
3 groups. Isolates of group 1(1 and II ) and group 2
( III to VI ) appeared to be representatives of the
genus Erwinia, whereas those of group 3 ( VII to X ) of
the genus Pseudononas
2 - Isolates of groups 1 and 2 and non-sporeforning, single
straight rods neasuring 0.6 - 0,7 x 0.8 - 0.9 µ- (group 1) and 0.5 - 0.8 x 0.95 µ(group 2), motile by 2 - 6 peritrichous flagella, surrounded by a slime layer, Gramnegative