Ramanujam, B.Chandra Mohanan, R.Nambiar, K.K.N.2014-08-062014-08-061993Journal of Plantation Crops 21(Suppl) p-123-128http://hdl.handle.net/123456789/4656Leaf spot disease of arecanut was severe during S. W. monsoon in several gardens in Uttara Kannada, Dakshina Kannada and Kasaragod districts. Phyllosticta arecae Hohnel and Co lletotrichutn gloeosporioides (Fenz.) Sacc. were found to be the most common pathogens associated with this disease. Pathogenicity of these fungi individually and in combination was established on arecanut seedlings. The frequency of isolation of these two fungi varied from place to place. In vitro fungicidal evaluation against these two pathogenic fungi revealed that Carbendazim (Bavistin, 0.05%), Captafol (Foltaf, 0.2%) and Mancozeb (Dithane M-45, 0.3%) checked the growth of the two fungi completely, while Bordeaux mixture (1%) inhibited 85.7% growth of P. arecae and 81.6% growth of C. gloeosporioides. Field control trails involving these four fungicides were carried out at two locations, viz., Yellapur (Uttara Kannada dist.) and Puttur (Dakshina Kannada dist.) It was observed that monthly sprays of Mancozeb (Dithane M-45, 0.3%), Captafol (Foltaf, 0.2%) and Carbendazim (Bavistin, 0.05%) during June-August were effective in reducing the intensity of leaf spot disease during S.W. monsoon period.enArticle