[Parasite control and its effect on the environment]

Chemical methods continue to be the primary means for control of parasites in medicine and veterinary medicine. Environmental concerns are raised mainly in the control of free living stages of parasites, intermediate hosts, vectors of diseases and in control of sanitary pests. Similarly, the type of application in case of sheep-dips and spraying of acaricides and insecticides in poultry houses against chicken mites is problematical. The now available bolus with ivermectin may cause a stronger impact on the cattle dung fauna and subsequent degradation of the dung as already known after injection and pour on.