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Five fungicides, 2 antibiotics and 2 combinations of fungicides and antibiotics were evaluated against incidence of bacterial and fungal diseases of Piper betle L. Cv. 'Desawari'. Copper oxychloride 50 WP (Blitox-50) at 0.25% at 15 days interval was most effective against mortality caused by Phytophthora parasitica var. piperina Dastur; whereas 0.25% Copper oxychloride 50 WP with 500 ppm streptocycline was best against leaf spots caused by Xanthomonas campestris pv. betlicola Dye. and Colletotrichum capsici Syd. (Butler & Bisby). Other formulations viz., Carbendazim (Bavistin), Trideomorph (Calixin), Mancozeb (Dithane-M-45), Copper oxychloride 50 WP (Kilex), Paushamycin and Streptocycline were only next to the copper oxychloride 50 WP (Blitox-50) or its combination with streptocycline.

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