Chemical composition and acaricide effect of the essential oils of leaves of Chenopodium ambrosioides and Eucalyptus saligna on ticks (Rhipicephalus lunulatus) of West African dwarf goat in West Cameroon.

摘要

The chemical composition and the acaricide effect of the essential oils from leaves of Chenopodium ambrosioides and Eucalyptus saligna was evaluated on Rhipicephalus lunulatus in the Laboratory of Environmental and Applied Chemistry of University of Dschang in west Cameroon. Five doses of each essential oil (0.000; 0.157; 0.314 and 0.629 micro l/cm2) in four replications were used. Each replication was made up of ten ticks in Petri dish with filter paper on the bottom and uniformly impregnated with the product. The results indicate that essential oils studied are toxic to Rhipicephalus lunulatus ticks. Significant (p<0,05) differences of mortality were observed between treatments. The highest mortality in the control group vary between 0 and 12,5% when the lowest dose (0.079 micro l/cm2) registered 60 and 100% respectively for the essential oils of E. saligna and C. ambrosioides. The DL50 obtained at the end of the second day showed that essential oils from the leaves of C. ambrosioides was more toxic (DL50=0,053 micro l/cm2) than dose of E. saligna (DL50=0,120 micro l/cm2), indicating a potentially high efficiency of those products on this parasite.