Abstract
The conditions favouring spread of Fusarium stilboides and development of the diseases it causes have been investigated. Spread of the fungus is mainly by raindrop splash, but insects and pruning secateurs may also spread it. Entry is through wounds, pruning wounds providing the commonest port of entry. Spore germination occurs in a humid atmosphere without free water at an optimum temperature of 30 °C. Optimum temperature for growth in culture is 25°. Viability in infected bark is retained for 12 months, pathogenicity for 6 months. The fungus loses viability in field soil after only 1 month. Weed competition predisposes the plants to disease, but heavy mulching partly compensates for this.
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