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2Department of Botany,Alpine Institute of Management &Technology, Dehra Dun, Uttarakhand -248 007, India
Cauliflowers (Brassica oleraceaea, var. botrytis) are annual or biennial and frost tolerant vegetable plants bearing large rounded leaves that resemble collards. It is often considered one of the healthiest foods on earth- owing to its rich supply of health-promoting phytochemicals, high level of anti-inflammatory compounds. Cruciferous plants (Brassicaceae) worldwide are severely affected by the Alternaria fungi. The leaf spot and seed disease caused by various species of Alternaria occur abundantly in some region of Garhwal Himalayas. This disease is highly prevalent and of late becomes so severe that growth and yield of the crop decreased considerably. The present work deals with the management of Alternaria leaf spot on cauliflower. The five isolates of A. brassicicola were collected and disease symptomatology was defined. In vitro efficacy of a fungicide, namely, Hexaconozole (a systemic fungicide) was tested against the isolates of Alternaria sp. Based on the results, it can be concluded that Hexaconozole is effective in suppressing the growth of Alternaria sp. In addition these isolates were interacted with two important biocontrol agents, T. harzianum and T. viride. Both the biocontrol agents were unable to control the growth of A. brassicicola as they did not touch the magical mark of 50 percent. Only one isolate (A5) was suppressed more than 50 percent by T. harzianum and T. viride.