Abstract
Today, there is a trend in research to return to plant extracts as remedies against endo- and ectoparasites. Many daily appearing papers describe the efficacy of different plant extracts. However, the second step, to develop a product for the market (that could settle obvious needs), is in general not done. Thus, many results will be forgotten soon and the work was done in vain. The present review shows in examples that very efficacious biocidal and repellent products were developed from extracts of the plants Vitex agnus castus, Azadirachta indica, and from others which produce etheric oils. Of course, it is needed that the extracts have to be tested seriously for their activity, non-toxicity, tolerability, and user compliance. However, the selected examples show that it is worthwhile to consider plants in the fight against endo- and ectoparasites.