Chemical Controls Chemical Controls Sometimes chemicals are required for weed control. A herbicide is any chemical which injures or kills a plant.
Herbicides are safe and effective if product label instructions are followed.
Herbicides are classified based on how and when they control weeds. Selective - A selective herbicide controls certain plant species without seriously affecting the growth of other plant species. The majority of herbicides used are selective herbicides. These are generally used to kill all plants, such as in the renovation or establishment of a new turf area or as spot treatment or as a trimming material along sidewalks, etc. Contact - Contact herbicides affect only the portion of green plant tissue that is contacted by the herbicide spray.