Cleome hirta essential oil as livestock tick (Rhipicephalus appendiculatus) and maize weevil (Sitophilus zeamais) repellent.
The repellency of C. hirta essential oil (from plants collected in Kenya) and of 3 identified constituents (phytol, (+)-cedrol and n-octacosane) was evaluated against R. appendiculatus and S. zeamais. In a tick climbing repellency bioassay, the oil exhibited repellency which, at the highest dose, was comparable with that of the commercial arthropod repellent N,N-diethyltoluamide (DEET). In a Y-tube olfactometer bioassay, the oil showed higher or comparable repellency against S. zeamais relative to DEET at all the doses tested. The potential of C. hirta in livestock tick and maize weevil control is discussed.