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Oviposition patterns in two species of bruchids (Coleoptera: Bruchidae) as influenced by the dried leaves of Tetradenia riparia, a perennial mint (Lamiales: Lamiaceae) that suppresses population size.

Weaver, D. K.; Dunkel, F. V.; Cusker, J. L.; Puyvelde, L. van;

Environmental Entomology Year: 1992 Vol: 21 Issue: 5 Pages: 1121-1129 Ref: 24 ref.

1992

บทคัดย่อ

Oviposition patterns in two species of bruchids (Coleoptera: Bruchidae) as influenced by the dried leaves of Tetradenia riparia, a perennial mint (Lamiales: Lamiaceae) that suppresses population size.

Tetradenia riparia is a Rwandan traditional medicinal plant reported to be used to prevent postharvest insect damage in traditional storage. The addition of milled or crushed leaves of T. riparia at more than or equal to 4% (wt/wt) to pinto beans (Phaseolus vulgaris) significantly decreased fecundity and fertility of Zabrotes subfasciatus and Acanthoscelides obtectus which resulted in smaller F1 populations. A concn of 10% leaves (wt/wt) added to P. vulgaris also increased cumulative larval and pupal mortality for Z. subfasciatus, a response which was caused by increased competition between Z. subfasciatus larvae within P. vulgaris. Competition could be influenced by the great decrease in percentage of P. vulgaris oviposited upon by Z. subfasciatus. The level of control achieved against the F1 populations did not persist. Hormoligosis, in the form of increased fecundity, was also found for leaves from 1 supply at the 1% concn. In general, the initial inhibitory effects were found to be reproducible using different supplies of leaves. The results were also consistent for the 2 species of Bruchidae, despite innate behavioural differences between them at oviposition and hatching.