Efficacy of fungicides to control three virulent isolates of Colletotrichum gloeosporioides on cocoa
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2007-02-08
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The widespread occurrence of Colletotrichum disease of cocoa in India warrants the study on the control of the disease. Symptomatology of this disease revealed that besides pod rot, there are three kinds of foliar symptoms namely, blight, shot hole and irregular spot caused by Colletotrichum gloeosporioides Penz. The relative efficacy of nine fungicides on the growth of three virulent isolates of C. gloeosporioides causing blight, shot hole and irregular spot symptoms on cocoa leaves was studied in the laboratory. Out of the nine fungicides tested in vitro Carbendazim (Bavistin WP=0.05-0.10 per cent) mancozeb (Dith-ane M-45=0.20 and 0.30 per cent) and ziram (Liquid Cuman=0.3 per cent) inhibited the growth of all the three isolates completely. There was considerable variation in growth among the three isolates at different concentrations of the various fungicides tested. The effect of the above three fungicides in controlling the foliar infection caused by the three isolates, when applied as pre- and post-inoculation sprays was studied. In both pre- and post-inoculation sprays, the leaf blight and irregular spots caused by the respective isolates were controlled effectively by Bavistin WP (0.05 per cent) followed by Dithane M-45 (0.2 per cent) whereas the shot hole symptom was effectively controlled by Dithane M-45 followed by liquid cuman (0.3 per cent). Thus Bavistin WP and Dithane M-45 were found to be promising fungicides to control C. gloeosporioides disease of cocoa.
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In: Proceedings, PLACROSYM VI, RRII, Kottayam, 16-20 Dec. 1984. Edited by M. R. Sethuraj and others 1987 p-159-169