Abstract
Exposure of corn plants inoculated with Puccinia sorghi to intermittent wetting during infection reduced subsequent disease development. Greatest inhibition of disease development was observed in plants wetted for 2 h before exposure to dryness. Microscopical examination revealed that in such plants uredospore germination and germ tube growth were greatly inhibited. Uredospores exposed to intermittent wetting on water agar or on Millipore membranes retained a high degree of germinability and infectivity to corn plants. It is suggested that sensitivity of corn rust uredospores to desiccation is host-induced.
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