Factors influencing the production of basidiocarps by Crinipellis perniciosa, the causal fungus of cocoa witches' broom [Theobroma cacao].
1986
Rocha H.M.
The production of basidiocarps of Crinipellis perniciosa on dead Witches' brooms was assessed in relation to different regimes of temperature and light, the type of cocoa, age of broom and type of tissue. Dead brooms from Brazil and Ecuador were hung individually in specially constructed cabinets within an illuminated room (60 u Einsteins/m(2)/s). Basidiocarps production was determined in the following temperature and light regimes 20 degrees-25 degrees C, 25 degrees-30 degrees C, 30 degrees-35 degrees C and 0, 10, 100 u Einsteins/m(2)/s. Brooms from different cocoa cultivars were used to determine the influence of genetic material on basidiocarp production. The effect of broom age on basidiocarp production was determined using 2, 3, 4 and 5 months old brooms. Basidiocarp formation was also assessed at node and internode regions of dead brooms. Most basidiocarps formed when brooms were subjected to successive wet and dry periods and illuminated at 100 u Einsteins/m(2)/s at 20 degrees-25 degrees C. Basidiocarps formed most prolifically on scavina clones 6 and 12 from Ecuador and at nodes rather than internodes. A three months period after the brooms had been dried was the minimum to start the basidiocarp production.
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