Herbicides can be classified according to the action mode, the site of drug application and the source of compound.

Classification by Function mode

(1) Selective herbicides: herbicides to different kinds of seedlings, the degree of resistance is also different, this potion can kill weeds, and seedlings harmless. such as cover grass can, fluorine spirit, grass net, simazine, fruit herbicide and so on.

(2) Herbicides: Herbicides are toxic to all plants, so long as they are exposed to green parts, seedlings and weeds, they will be harmed or killed. Mainly in the sowing before, sowing before the emergence of the nursery, the main vice road used. such as glyphosate.