Erler F, Ulug I, Yalcinkaya B
Essential oils extracted from the seeds of anise (Pimpinella anisum), dried fruits of eucalyptus (Eucalyptus camaldulensis), dried foliage of mint (Mentha piperita) and basil (Ocimum basilicum) and fresh foliage of laurel (Laurus nobilis) were tested for their repellency against the adult females of Culex pipiens. All essential oils showed repellency in varying degrees, eucalyptus, basil and anise being the most active.
Erler F, Ulug I, Yalcinkaya B. Repellent activity of five essential oils against Culex pipiens. Fitoterapia. 2006;77(7-8):491-494.