Abstract
In greenhouse experiments, powdery mildew [Erysiphe graminis] on wheat leaves was stopped 6 days after inoculation by a root application of benomyl. Three days after benomylapplication, the plants were inoculated with a benomyl-tolerant mutant of Fusarium colmorum. Thus, the fungus was able to establish itself on the leaves, whereas neither wild-type nor mutant strains could infect healthy (powdery mildew-free) leaves. It is concluded that powdery mildew pustules allow F. culmorum to infect wheat leaves.

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