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Effect of Fungicide Volatiles on Sporangial Production of Plasmopara viticola. T. Wicks, South Australian Department of Agriculture, Box 1671 G.P.O., Adelaide. T. C. Lee, Adelaide Botanic Gardens, North Terrace, Adelaide, South Australia. Plant Dis. 66:945-946. Accepted for publication 18 February 1982. Copyright 1982 American Phytopathological Society. DOI: 10.1094/PD-66-945.

The production of sporangia of Plasmopara viticola was almost completely inhibited by volatiles emanating from a 0.05-mg deposit of metalaxyl added to a 250-ml container of tissue-cultured grapevines 1 day after inoculation. Methyl-2-[N-phenylacetyl-N-(2,6-dimethylphenyl)amino]propanoate also inhibited sporulation but not to the same degree as metalaxyl. Phosethyl aluminum, mancozeb, and cyprofuram did not inhibit sporulation when added to containers 1 or 3 days after inoculation.