The bark of Prunus africana, a tree growing in African highland forests, has been exported from Cameroon to Europe since 1972 for the treatment of benign prostatic hypertrophy (BPH). Bark harvesting has had a devastating effect on the tree in Cameroon, Africa’s largest P . africana bark exporter. This paper assesses the adoption potential of P. africana a m o n g s m a l l-scale farmers,that is, its profitability, acceptability and market potential. While not as profitable as Eucalyptusspp, an alternative enterprise, farmers want to grow P. africana because it is compatible with many crops and has multiple uses –bark sales, medicine, tools, poles, seed sales, and mulch. In fact, several thousand farmers have planted the tree. The availability of markets also appears high, as herbal treatments of BPH are popular and demand is likely to grow. Research is needed in four areas to help P . africana play a sustainable role in improving the livelihoods of s m a l l-scale farmers: domestication, understanding farmers’ experiences growing and using the tree, market assessments, and tree tenure. Moreover, progress on promoting P. Africanaa s a s m a l lholder enterprise is dependent on Cameroon meeting the demands of the European Union and the Convention on International Trade in Endangered Species to conserve and sustainably manage the tree
Tag: bark
Pine needle consumption and bark stripping by sheep grazing annual pastures in young stands of widely spaced Pinus radiata and ppinaster.
The consumption of the pine needles and the stripping of bark by sheep grazing annual pastures in three open stands of P. radiata and one of P. pinaster were measured. The P. radiata were four years old and the densities were 250, 500 and 750 trees ha-1. The P. pinaster included two, three and four year-old trees and the density was 440 trees ha1. Needles were eaten immediately after the sheep were admitted and this continued throughout the year. Within ten weeks of the start of winter grazing, sheep stocked at 7–10 ha1 had eaten about half of the accessible needles on both species where densities were less than500 trees ha1. The estimated consumption was about 260 g sheep1 day1 for the P. radiata. Bark stripping then commenced and continued throughout spring and summer on most plots. In some plots at low tree density, bark was stripped from more than 35% of the trees. In denser stands, needle consumption per tree was less and bark was stripped from less than 5% of the trees. Bark damage was most common on the smaller trees, and severity of stripping was negatively correlated with tree size. Of all the trees with bark damage, 22% of the P. pinaster and 14% of the P. radiata had more than half of the stem circumference stripped. A number of these will probably suffer both stem distortion and growth retardation, and some may die. Methods of reducing the incidence of bark damage are discussed.