Abstract
The goatweed, Ageratum conyzoïdes L., contains the same chromenes, precocenes 1 and 2, as the bedding plant, A. houstonianum. A crude lipid extract from the goatweed exerts ovicidal action and induces sterility after topical treatment of both young last instar larvae (L6) and females of Dysdercus flavidus Sign. at emergence by inhibiting ovarian development. The chromenes survived metabolism for at least 12 days. The action of the two chromenes in the crude extract is synergistic.
Résumé
L’herbe bouc Ageratum conyzoïdes L. contient les mêmes substances antiallatotropes, soit precocènes 1 et 2, qu’A. houstonianum. Un extrait brut lipidique à partir de la plante d’A. conyzoïdes a une action ovicidale; des jeunes larves du dernier stade (L6) aussi bien que des femelles de Dysdercus flavidus Sign. traitées à l’émergence topiquement produisent des adultes stériles par suite d’une inhibition du développement ovarien. Ces substances actives survivraient le métabolisme à l’intérieur de l’insecte pour une période d’au moins 12 jours. Les deux chromènes agiraient en synergie dans l’extrait brut.
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Fagoonee, I., Umrit, G. Anti-Gonadotropic Hormones from the Goatweed, Ageratum Conyzoïdes. Int J Trop Insect Sci 1, 373–376 (1981). https://doi.org/10.1017/S1742758400000692
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DOI: https://doi.org/10.1017/S1742758400000692