Au Cameroun, les Loranthaceae ont été signalées dans quelques bassins de production du cacao. Cette étude a été menée dans le but de caractériser le parasitisme des cacaoyers de la localité de Tombel, au Sud-Ouest Cameroun. Les observations des Loranthaceae ont porté sur les arbres âgés de 8 à 10 ans, et sur une superficie de 7500 m². Sur chaque pied de cacaoyer, les données suivantes ont été collectées et notés : la circonférence à 1,30 m du sol , la hauteur, le nombre de branches, les espèces de Loranthaceae présentes, et le nombre de touffes des parasites. Au total, quatre espèces de Loranthaceae ont été recensées sur les cacaoyers, Helixanthera mannii étant la plus fréquente. Le taux de parasitisme des plantations était de 35,33% et la densité parasitaire moyenne était de 3±2 touffes/arbre. Les arbres parasités ont montré des circonférences et des hauteurs significativement plus élevées que les arbres sains. Le coefficient de rang de Spearman a montré une corrélation positive et significative entre la hauteur de l’arbre et le nombre de touffes des Loranthaceae. Il s’avère donc nécessaire de mettre en place un programme de contrôle des Loranthaceae dans les plantations afin de réduire les pertes de production, mais également de mener une étude approfondie sur la biologie et l’écologie d’ Helixanthera mannii qui, dans le futur, pourrait s’avérer être une menace pour les cacaoyers. In Cameroon, Loranthaceae have been reported in some cocoa production basins. This study was conducted to characterise the parasitism of cocoa trees in the locality of Tombel, South-West Cameroon. Observations of Loranthaceae were made on trees 8 to 10 years old, and on an area of 7500 m². On each cocoa tree, the following data were collected and recorded: circumference at 1.30 m from the ground, height, number of branches, Loranthaceae species present, and number of pest clumps. In total, four species of Loranthaceae were recorded on cocoa trees, Helixanthera mannii being the most frequent. The parasitism rate of the plantations was 35.33% and the average parasite density was 3±2 clumps/tree. Parasitised trees showed significantly higher girths and heights than healthy trees. Spearman's rank coefficient showed a significant positive correlation between tree height and the number of Loranthaceae clumps. It is therefore necessary to set up a control programme for Loranthaceae in plantations in order to reduce production losses, but also to carry out an in-depth study on the biology and ecology of Helixanthera mannii, which could prove to be a threat to cocoa trees in the future.
Citrus farming is currently a main sector in Africa in general, particularly in the sub-Saharan region. Citrus farming in Cameroon has been expanding since the cocoa crisis and thanks to its financial and economic benefits. The research aim was to evaluate the parasitism of Loranthaceae on citrus trees in the Mongo department. Direct observations were made in the canopy of 796 citrus trees in seven arrondissements, and included species identification, and the Loranthaceae species growing on their foliage. Alive and dead tufts were numbered to estimate parasitism density and mortality rate. Five species of Loranthaceae identified on six citrus species. Tapinanthus predominated with three species, T. bangwensis T. preussii and Tapinanthus sp. Phragmanthera capitata was the most frequent (75.37%), and T. preussii was scattered (2.33%). The highest mean parasitic density was obtained in T. bangwensis has the higher parasitic density (5.76±5.17 tufts/tree), followed by Helixanthera mannii (5.42±4.13 tufts/tree). The highest rate of parasitism was obtained on C. maxima (89.77%), and the highest natural mortality rate of Loranthaceae was on C. medica (12.5%). Loranthaceae have already greatly expanded in Citrus, it recommended to set up a monitoring system to protect the yields.
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