Abstract
Light and nutrition are the important factors in the production of pycnidia and conidia by cowpea isolates of the Phomopsis state of Diaporthe phaseolorum. The highest number of pycnidia and conidia were produced on plant tissue exposed to cool-white fluorescent light. In semisynthetic media more pycnidia were formed at high glucose concentrations, but they matured more slowly than those formed at lower glucose concentrations. Both the level of conidiation and the percentage of pycnidia that formed conidia were higher at lower glucose concentrations. The best artificial medium for inducing a high number of pycnidia containing abundant conidia was one that contained 0.4% glucose and 0.4% NaNO3. A number of carbon sources could replace glucose in this medium.
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