Environmental Entomology (1992) 21, 1121-1129

David K. Weaver, Florence V. Dunkel, James L. Cusker and Luc Van Puyvelde (1992)
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
Environmental Entomology 21 (5), 1121-1129
Abstract: Tetradenia riparia (Hochst.) Codd. is a Rwandan traditional medicinal plant reported to be used to prevent postharvest insect damage in traditional storage. Addition of milled or crushed leaves of T. riparia at >4% (wt/wt) significantly decreased fecundity and fertility of Zabrotes subfasciatus (Boheman) and Acanthoscelides obtectus (Say), which resulted in smaller F₁ populations. A concentration of 10% leaves (wt/wt) also increased cumulative larval and pupal mortality for Z. subfasciatus. The increased mortality may be caused by increased competition between Z. subfasciatus larvae within the bean. Competition could be influenced by the great decrease in percentage of beans oviposited upon by Z. subfasciatus. The control achieved against the F₁ populations did not persist. Hormoligosis, in the form of increased fecundity, was also found for leaves from one supply at the 1% concentration. In general, the initial inhibitory effects were found to be reproducible using different supplies of leaves. Results were also quite consistent for the two species of Bruchidae, despite innate behavioral differences between them at oviposition and hatch.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): David K. Weaver, Florence V. Dunkel

Research topic(s) for pests/diseases/weeds:
control - general

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Acanthoscelides obtectus	Stored legumes
	Zabrotes subfasciatus	Stored legumes