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Copper (I and 11) and iron (I1 and 111) ions had qualitatively similar effects on the degradation of radiolabelled 3-indolylmethylglucosinolate. In the presence of myrosinase they increased the production of 3-indolylacetonitrile (IAN) largely at the expense of ascorbigen (ASC). With the addition of these metal ions the ratio of IAN to the products of the alternative pathways (3,3'-diindolylmethane, ASC and formaldehyde) decreased as the pH increased from 4 to 7. These ions also led to a small increase in the non-enzymic production of IAN.

S U M M A R YPowdery mildew (Sphaerotheca fuliginea) infection of cucumber leaves was earlier and increased more rapidly on plants with black root rot (Phomopsis sclerotioides) than on plants with healthy root systems in the same glasshouse.