The efficacy of the insecticide Oxyfly (active compound lambda-cyhalothrin) was tested against specimens of Culicoides species-the vectors of Bluetongue virus-and other insects. Living specimens of the insects were brought into contact for at least 10-15 s with treated wooden plates and the extinction period of the insects was followed over the next minutes or hours. It turned out that this rather short contact was sufficient to kill the Culicoides specimens in minutes and the other insects in a few hours even if the plates had been impregnated 9 weeks before.