Abstract
Metalaxyl at low concentrations was highly inhibitory to mycelial growth and formation of sporangia, chlamydospores and oospores of P. parasitica and/or P. citrophthora. Chlamydospore germination was sensitive to low concentrations of metalaxyl, but zoospore germination was not greatly reduced. With both spore types, however, germ tube growth was highly sensitive to metalaxyl. Metalaxyl therefore controls the diseases caused by these Phytophthora fungi by affecting the pathogens at all stages of their life cycle.

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