Documentary and disease calendar for diseases of Jatropha curcas in northern dry zone and northern transition zone of Karnataka.

摘要

Survey for diseases in different plantations and hedge rows falling under northern-dry zone and northern-transition zone of Karnataka revealed the occurrence of white mold, leaf spot, root rot, stem canker, mosaic and different leaf blights. Disease calendar of J. curcas conducted at fortnight interval in Hunumanmatti plantation from July 2006 to June 2007 revealed occurrence of six diseases. By the onset of monsoon Colletotrichum leaf spot appeared from July to September. Pestalotiopsis leaf blight was found with high severity from August to September end and with low intensity during October end. Colletotrichum leaf blight and fruit rot appeared from September to November. Cylindrocladium white mold occurred during October with gradually increased intensities till January and extended up-to February with gradual reduction. In addition mosaic was found from January to March. Among these Colletotrichum leaf blight and Cylindrocladium white mold were categorized as threatening by considering their damage to fruits.