Relative susceptibility of four species of African mahogany to the shoot borer Hypsipyla robusta (Lepidoptera: Pyralidae) in the moist semideciduous forest of Ghana

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“…In the first rigorous study of shade effects on African Swietenioideae, overhead shade did reduce attack, but also severely limited growth, for K. anthotheca and K. ivorensis in Ghana (OpuniFrimpong et al, 2008b). Seedlings and saplings of K. anthotheca and K. ivorensis were more susceptible to shoot borer attack but grew faster than E. angolense and E. utile (Opuni-Frimpong et al, 2008a).…”

“…However, not only is complete removal of populations a threat, but population reductions from logging or forest fragmentation may reduce genetic variation and lead to increased isolation and inbreeding. Several species of Khaya and Entandrophragma are being harvested at such rapid rates that it is difficult to locate germplasm for ex situ conservation (Opuni-Frimpong et al, 2008a). At a site in Brazil, post-logging seedlings of S. macrophylla showed reduced genetic diversity compared to the adult population that survived logging (André et al, 2008).…”

“…in Australia, Thailand, Laos, Vietnam, Malaysia, and the Philippines (Kalinganire and Pinyopusarek, 2000;Cunningham and Floyd, 2002). Papers in this issue report on a preliminary assessment of the genetic basis for tree improvement in Ghana (Opuni-Frimpong et al, 2008a) and genetic variation in quantitative traits from extensive trials of provenances and families of C. odorata and S. macrophylla in the Yucatan Peninsula of Mexico Wightman et al, 2008). Genetic variation in susceptibility to shoot borer attack has been observed throughout the Swietenioideae (Newton et al, 1993;Cunningham and Floyd, 2002;Navarro et al, 2004), although this was not found for C. odorata and S. macrophylla in the Yucatan trials Wightman et al, 2008).…”

O Cultivo do Mogno Africano (Khaya spp.) e o Crescimento da Atividade no Brasil

“…Ofori et al (2007) afirmaram que o comércio contínuo da madeira nativa do mogno africano se encontra ameaçado pela intensa exploração das florestas e pelas dificuldades no estabelecimento de plantações de mogno em seu local de origem, devido ao ataque da broca de ponteira Hypsipyla robusta Moore, mesmo problema ocorre para a S. macrophylla em relação à H. grandella. O ataque da Hypsipyla destrói os brotos terminais, fazendo com que se bifurquem, retardando o crescimento e reduzindo o valor econômico da madeira (Grogan et al, 2002;Lim, 2007;Opuni-Frimpong et al, 2008a). Ofori et al (2007) .…”

History, Impact of Soil Types on Stand Structure and Growth of the Dry Zone Mahogany (Khaya senegalensis (Desr.) A.Juss.) in Plantation in Benin (West Africa)

“…The attack by boring insects and caterpillars was noticed by Sokpon et Ouinsavi [26] 2002. Previous study Opuni-Frimpong [11] et al (2008) shows that severely attacked by shoot borers (Hypsipyla robusta) can negatively impact the timber value; however, the shoot borer operates in the Top End of the tree (Sokpon et Ouinsavi [26], 2002). Moreover, plantation cleaning is not regular but we do not notice human pressures and fire damage.…”