A new Phytolyma species from Cameroon is described. Phytolyma tchuentei sp.n. is similar to P. minuta Hollis but antenna, male and female terminalia are different from the four described African Phytolyma species. P. tchuentei sp.n. develops on Morus mesozygia (Moraceae). Unlike the other Phytolyma species, the new species does not cause galls on leaves and buds of its host.
In order to investigate the biodiversity of psyllids in Cameroon, we collected a psyllid on Eucalyptus spp. (Myrtaceae) for the first time. Morphometric and morphological studies of this psyllid enable us to identify it as Blastopsylla occidentalis Taylor (Hemiptera: Psylloidea). Blastopsylla occidentalis lives on four Eucalyptus species (Eucalyptus globulus, E. saligna, E. deglupta, E. camaldulensis) in the Western and Central regions of the country. A description and illustration of the different developmental stages of B. occidentalis will allow the identification of this pest of Eucalyptus.
Resistance of malaria vectors to synthetic chemicals with high operational cost and environmental pollution has been a great challenge to scientists. Alternative approaches such as the use of natural plant products which are environmentally friendly are put in place to control malaria vectors. This study was focused on testing the effectiveness of three solvent extracts of Lantana camara on the 3rd instar larvae and adults of Anopheles gambiae s. l. These extracts were obtained by maceration. Bioassays test were carried out by WHO’s method for determination of larvicidal and adulticidal efficacy. The results show that, larval mortality increased significantly with the concentration and exposure time. Lethal concentrations 50 (LC50) and 95 (LC95) after 24 hours of larvae exposure time are respectively 0.31 g/mL and 1.53 g/mL while within 48 h they are 0.27 g/mL and 0.79 g/mL for hexane extract; 1.45 g/mL and 2.0 g/mL (24 h exposure), 0.84 g/mL and 1.55 g/mL (48 h exposure) for acetone extract; 1.96 g/mL and no lethal concentration causing 95% mortality was determined; 0.40 g/mL and 2.20 g/mL (48 h) for aqueous extract. The efficacy of hexane and aqueous extract on the adult knock down and mortality were not significant even with the increasing extract concentrations and exposure time whereas with acetone extract, the adult LC50 after 24 h was 2.4 g/mL but with 95% mortality lethal concentration was not determined. According to the results, hexane extract showed high larvicidal efficacy of An. gambiae and acetone extract showed significant adult mortality. Those two extracts of L. camara can be used to fight against An. gambiae as alternative malaria vector control to replace conventional insecticides.
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