Abstract
SUMMARYThree‐ or 4‐year‐old plum trees of the varieties Victoria and Purple Pershore, infected in the trunk with spore suspensions during the autumn, proved suitable for testing the effects of chemicals injected in the attempt to cure silver leaf disease (Stereum purpureum) and provided material for the assessment of the effects over more than one season.Indications were found that the amount of silvered foliage was related to the amount of mycelium present in the wood. Injection of 0.5% 8‐hydroxyquinoline potassium sulphate (Oxine KS) at different times in the season increased the volume of diseased wood, but there was evidence that it reduced the density of active fungal mycelium in the wood. No permanent reduction in disease symptoms was found to result from the injection of either Oxine KS or griseofulvin.
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