Evolution of host acceptability and suitability in Callosobruchus maculatus (Coleoptera: Bruchidae) developing on an occasional host: importance for pest status prediction

Abstract

In West Africa, Callosobruchus maculatus Fabricius mainly develops on cowpea (Vigna unguiculata (L.) Walpers) and sometimes on Bambara groundnut (Vigna subterranea (L.) Verdcourt). A survey on the development of a C. maculatus strain selected on cowpea was undertaken during eight generations on two local varieties of Bambara to determine their level of acceptability and suitability for the pest and its evolution over time and successive generations. When C. maculatus females were in contact with seeds from both Bambara varieties for the first time, they laid fewer eggs on these hosts in comparison with cowpea. However, females that have developed inside Bambara cv. Local Beige seeds deposited more eggs on their hosts of origin from the first generation onwards. The same result was obtained on Bambara cv. Local Striped seeds from the F4 generation onwards. Egg viability was not affected by host variability. On the contrary, the larval survival was significantly reduced on Bambara seeds. Larval survival and intrinsic rates of natural increase were improved on both Bambara varieties with successive generations in comparison to cowpea. Our results demonstrate that in a non-choice situation, C. maculatus is able to develop on both Bambara cv. and even increase its reproduction potential over successive generations, regardless of the climatic variations. The results help to better understand why C. maculatus is becoming a serious concern on Bambara in West Africa where the pest is frequently in contact with this occasional host.

Callosobruchus phaseoli (Gyllenhal, 1833) (Coleoptera, Chrysomelidae, Bruchinae): a new invasive species in Kazakhstan

“…Kazenas. Species taxonomy, biology and distribution data were taken from Lukyanovich & Ter-Minassian (1957), Ter-Minassian (1974), Archibald & Chalmers (1983), Egorov (1996), Tuda (1996), Lambrides & Imrie (1999), Mordkovich & Sokolov (1999), Vasyutin et al (2001), Porca (2003), Kingsolver (2004), Robinson (2005), Tuda et al (2005Tuda et al ( , 2006, Walker (2006)…”

“…In brackets the year when the species was recorded in the country or region. (Lukyanovich & Ter-Minassian 1957, Ter-Minassian 1974, Archibald & Chalmers 1983, Egorov 1996, Tuda 1996, Lambrides & Imrie 1999, Mordkovich & Sokolov 1999, Vasyutin et al 2001, Porca 2003, Kingsolver 2004, Robinson 2005, Tuda et al 2005, 2006, Walker 2006, Hagstrum & Subramanyam 2009, Beenen & Roques 2010, Yus Ramos et al 2014, Anton 2010, Temreshev 2017).…”

Capacités de discrimination des femelles de quatre souches de <em>Callosobruchus maculatus</em> Fab. (Coléoptera : Chrysomelidae, Bruchinae) pour la localisation de l’hôte et la ponte aux dépens d’hôtes secondaires

“…et Cajanus cajan (L.) Millsp. sont d'une grande importance socio-économique dans les pays où elles sont cultivées (Ignacimuthu et al, 2001;Tuda et al, 2005;Sankara et al, 2010).…”

“…De toutes ces espèces, le niébé, Vigna unguiculata (Walp. ), reste la plante hôte de référence pour Callosobruchus maculatus (Khéllouche et al, 2004 ;Iloba et al, 2007 ;Sankara et al, 2010). Les femelles déposent les oeufs sur les gousses ou sur les graines et le développement post-embryonnaire s'effectue à l'intérieur des graines, aux dépends des réserves nutritives localisées dans les cotylédons et du germe.…”