SUMMARY Cuticular and cellular components of leaves of Citrus aurantifolia Swingle were tested for toxicity to Gloeosporium limetticola Clausen, responsible for the withertip disease. Cuticular waxes isolated from mature, resistant leaves showed little activity. A dimethoxy furocoumarin, isopimpinellin, isolated from the cellular components, was highly toxic, and ester and acidic fractions obtained from both young susceptible and mature resistant leaves showed some activity. The contents in the leaves and the toxicitiesin vitroof the active constituents suggest that they may contribute, to an important degree, to the defence of the leaf against G. limetticola.
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Martin et al. (1966) studied this question.