Abstract
Citrus limonoids limonin, deoxylimonin, and citrolin were examined for activity as antifeedants and growth disruptors against larvae of the spruce bud worm, Choristoneura fumiferana (Clemens). Diet consumption assays indicated no significant depresston of feeding by these compounds incorporated at 1,000 ppm in short-term (48 h) no-choice and choice tests. Long-term feeding studies (fourth instar to pupa) showed that high concentration of citrolin (500 ppm) extended larva development time by 40% over that of controls; limonin and deoxylimonin had no significant effects on development. Pupal weights of individuals fed limonoids were not affected.
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