The Bayer company markets a range of weed killers for use on lawns. The active ingredients of all herbicides must receive environmental and safety approval by the U.S. Environment Protection Agency to be sold legally in the United States. Active ingredients are useful for specific kinds of weeds. Identifying weeds is a key to selecting the right weed killer, whether is is made by Bayer or another company.
Grassy weeds, including crabgrass, are grasses that grow as weeds in lawns; they emerge as single leaf with parallel veins. Dandelions, clover and other broadleaf weeds emerge from seeds with two leaves that have net-like veins. Goosegrass and other summer annual weeds germinate in the spring and die in the fall. Chickweed and other winter annuals germinate in the fall and die early next fall. Wild garlic, clover and other perennial weeds grow for two or more years. The labels of Bayer and other herbicides tell which of these weeds are best controlled by the active ingredients in that particular weed killer.
Weed Killer Active Ingredients
Bayer sells herbicides under different names, which are combinations of the active ingredients that have met EPA approval.
The herbicide called 2,4-D (2,4-Dichlorophenoxyacetic acid), the most widely used herbicide in the world, is a synthetic plant hormone used to control broadleaf weeds. Dicamba (3,6-dichloro-2-methoxybenzoic acid) is used to kill annual and perennial weeds and broadleaf weeds before and after they sprout. Mecoprop, aka MCPP (methylchlorophenoxypropionic acid) is used to kill broadleaf weeds. MSMA (Monosodium methyl arsenate) is an organic form of arsenic that is used to kill crabgrass and grassy weeds. Quinclorac (quinolinecarboxylic acid), kills weedy grasses by mimicking an overdose of the plant hormone auxin.
Bayer Weed Killer Brands
Bayer markets a number of weed killers using different combinations of active ingredients blended to control specific weeds. These Bayer brands include Weed Killer for Lawns, Season-Long Weed Control for Lawns, Southern Season-Long Weed Control for Lawns, All-in-One Weed and Crabgrass Killer, Bermuda Control for Lawns and Southern Weed Killer for Lawns. Bayer Southern Weed Killer is formulated to kill weeds that afflict lawn grasses found in warm, humid areas of Florida and the southern United States. Bayer All-in-One Weed and Crabgrass Killer is formulated to kill both broadleaf weeds and crabgrass and other grassy weeds that are a special problem for lawns.
Bayer Southern Weed Killer
Bayer Southern Weed Killer is a mix of 2,4-D, dicamba and mecoprop that kills most broadleaf weeds. Agronomists at the University of California, Davis, warn that the dicamba in this herbicide can kill ornamental plants if it drifts onto them during spraying or their roots are in a lawn.
Bayer All-in-One Weed and Crabgrass Killer combines the active ingredients found in Bayer Southern Weed Killer plus MSMA to give more control over grass weeds. University of California agronomists say the dicamba in this herbicide is also a threat to ornamentals.