Horsetail (EQUISETUM Arvense) is a perennial herbaceous plant whose name ‘Arvensis’ in Latin means “from the prairie, field or grasslands”. It is a fungicide that has a high content of Silica in addition to Potassium and Calcium. It favors the structure of the plant by acting directly on the roots, making it more resistant. It has been used traditionally in a multitude of medicinal remedies. It should be noted its richness in organic acids such as nicotine, palustrin, etc. and equisetonin as a fungal toxin. Components that make Horsetail one of the most effective fungicides. It is also used to control fungi, which infect the plant such as:> Rust (wounds on the leaves)> Oidiosis (white powder on the leaves)> Mildew (whitish spots under the leaves)> Phytophopthora sp (rot and wilt plants)> Septoria (dark spots on leaves)> Botrytis sp. (rot of shoots, flowers and fruits)> Alternaria (dark spots on leaves), etc.