Abstract
Interest in the rôle of toxins in plant disease was sharply aroused by the claim, made in 1941, that the symptoms of a disease had been alleviated by “antidoting” toxins formed by the pathogen. Although this has not been proved, it is now known that several toxins do produce some of the symptoms of certain diseases. But other mechanisms are involved, and toxin-inactivation seems unlikely to become a practical method of disease control.

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