Herbicides for Weeds

Weeds are unwanted, opportunistic plants that can invade lawn environments when grass growth is weak and unhealthy. The best method of weed prevention is cultivating an optimum environment for the growth of lawn grass that will effectively out-compete any weed invaders. However, if environmental controls alone are insufficient, weed herbicides can be used to aid in the prevention and removal of lawn weeds.

Selective Pre-Emergent

Selective, pre-emergent herbicides are methods of weed prevention that target specific annual grassy and broadleaf weeds before germination. Pre-emergent herbicides should be sprayed over the lawn surface several weeks before seed germination. They are ineffective after germination. Examples of selective, pre-emergent herbicide chemicals include trifluralin, bensulide, simizine and oryzalin. Read the product label to determine which weed type is targeted by a specific product.

Selective Post-Emergent

Selective, post-emergent herbicides are methods of weed removal that target specific weed varieties after seed germination. After weed growth is visible through the turfgrass, post-emergent herbicides should be applied directly on the weed foliage. Examples of selective, post-emergent herbicide chemicals include dicamba, fluazifop-butyl and sethoxydim.

Non-Selective Post-Emergent

Non-selective, post-emergent herbicides provide a general solution to weed removal by targeting a wide variety of weed species after they have matured. Some collateral damage to surrounding plants and grass is possible due to misdirected spraying during application and chemical leaching through the topsoil. Examples of non-selective, post-emergent herbicide chemicals include glyphosate and triclpyr.

Keywords: pre-emergent weed herbicides, post-emergent weed herbicides, weed herbicides

About this Author

Ryan Kane is an experienced professional pilot and freelance writer. In addition to writing about aviation related topics, Kane enjoys writing about a diverse range of science and technology topics.