Alternaria leaf blight is one of the most important diseases of gerbera (Gerbera jamisonii) worldwide. The disease was prevalent in all the flower growing areas of Kashmir valley surveyed during 2009. The overall mean disease incidence and intensity ranged from 50.7 to 67.5% and 19.2 to 28.2%, respectively. The highest disease incidence (60.72%) irrespective of phonological stages and intensity (24.96%) was recorded in district Srinagar. The lowest level of disease was in district Anantnag (56.5 and 20.0%, respectively). The pathogen associated with the disease was identified as Alternaria alternata (Fr. Keissler). In early stages of disease development, spots were circular and brown with somewhat irregular margins; the lesion later turned dark brown. Maximum disease development in the field was observed during June when spots attained a maximum size of 23 to 26 mm.
Key words: Gerbera, Leaf blight, Alternaria alternata, symptomatology, disease incidence.
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