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Differences in the development of heliothis virescens when given artificial diets with admixtures of secondary plant substances and amino acids

, : Differences in the development of heliothis virescens when given artificial diets with admixtures of secondary plant substances and amino acids. Mededelingen van de Faculteit Landbouwwetenschappen Universiteit Gent 46(2): 591-598

Secondary substances were tested: nicotine, quercetin and gossypol which are resistance factors that showed obvious activity on H. virescens even in low concentrations. The activity of these substances was evident on 2 levels: rate of development and weight of pupae. Gossypol and quercetin slowed development, while nicotine diminished pupae weight. Individual amino acids had activating or inhibitory properties. The slowing of the rate of development in the case of quercetin was negated with additions of amino acids. This could explain the insignificant role of quercetin as a resistance factor. Nicotine was more difficult to antagonize by increasing amino acid content. The decreasing weight of pupae was stopped only by methionine. In combination with gossypol, the S-containing amino acids maintain the weight of pupae, but do not shorten development time in comparison with quercetin.

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