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Experimental Control of Late Blight of Tomatoes with Capsidiol, the Phytoalexin from Peppers. E. W. B. Ward, Agriculture Canada, Research Institute, University Sub Post Office, London, Ontario N6A 3K0; C. H. Unwin(2), and A. Stoessl(3). (2)(3)Agriculture Canada, Research Institute, University Sub Post Office, London, Ontario N6A 3K0. Phytopathology 65:168-169. Accepted for publication 2 August 1974. DOI: 10.1094/Phyto-65-168.

Capsidiol, the phytoalexin from peppers, applied in solution in water as a spray to tomato plants, effectively controlled late blight at concentrations down to 5 × 104 M, under growth-room conditions. The compound effectively protected plants for at least 8 days, the longest period tested. These experiments demonstrate the potential of phytoalexins as sources of new fungicidal compounds.