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Observations on fungicide control of witches' broom, black-pod and pink disease of Theobroma cacao



Observations on fungicide control of witches' broom, black-pod and pink disease of Theobroma cacao



Ann Appl Biol 40(2): 362-376



Cacao trees in Trinidad were sprayed with 1% Bordeaux mixture for the control of witches-broom (Marasmius perniciosus), using knapsack-type pumps. Young trees were sprayed completely, but the cropping regions only on mature trees. The no. of vegetative brooms was significantly reduced with monthly applns., but there were marked differences between clones (ICS 4, 5, 20, 97). ICS 4 showed an increase in no. of cushion brooms associated with Bordeaux applns. There were significant reductions in no. of witches-broom pods and of total diseased pods (Marasmius, Phytophthora and Diplodia infections) following monthly applns. of Bordeaux mixture to the cropping regions. Fortnightly applns. of Bordeaux mixture effectively controlled pink disease (Cortlcium salmonicolor). In subsequent expts. in Nigeria, 1% carbide Bordeaux (1b, CuSO4, 6 oz. CaC2, 10 gal. H2O) was applied with knapsack-type pumps to the developing fruits at 1, 2, 3 and 4 wk. intervals, for the control of black-pod (Phytophthora palmivora). All spray treatments reduced the no. of black pods significantly. 0.1% Perenox (Cu2O) was slightly less effective as compared with carbide Bordeaux, at monthly intervals. The black-pods which occurred despite spraying were mostly high pods (more than 7 ft. above the ground). The possibility of reducing the no. of spray applns. is considered in the light of experience in Fernando Po, where Bordeaux mixture is used almost universally for controlling black-pod disease.

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