Germination of Coffee Rust Uredospores and Their Inhibition by Cinnamic Acid Derivatives

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Abstract
Germination of uredospores of the coffee rust fungus (Hemileia vastatrix) was influenced by the ratio of the spore concentration to the volume of Tween-20 solution on which the spores were floated. Uredospore clumps readily formed a film in which spores floated and spread on the surface. The possible role of this film in the infection process is discussed. Twenty-four cinnamic acid derivatives were assayed for uredospore germination inhibition. The similarity in uredospore germination inhibition and chromatographic properties of the coffee rust germination self-inhibitor and that of some methoxycinnamic acids suggest that the coffee rust self-inhibitor may be a cinnamic acid derivative.

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