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The industry-sponsored Herbicide Resistance Action Committee (HRAC) advises on the use of herbicides in crop protection and classifies the available compounds according to their chemical structures and mechanism of action so as to manage the risks of pesticide resistance developing. [4] The 2024 HRAC poster of herbicide modes of action includes ...
MCPA (2-methyl-4-chlorophenoxyacetic acid) is a widely used phenoxy herbicide introduced in 1945. It selectively controls broad-leaf weeds in pasture and cereal crops . The mode of action of MCPA is as an auxin , which are growth hormones that naturally exist in plants.
MCPB, 2,4-MCPB, 4-(4-chloro-o-tolyloxy)butyric acid (), or 4-(4-chloro-2-methylphenoxy)butanoic acid is a phenoxybutyric herbicide.In the United States it is registered for use on pea crops before flowering, for post-emergence control of broadleaf annual and perennial weeds including Canadian thistle, buttercup, mustard, purslane, ragweed, common lambsquarters, pigweed, smartweed, sowthistle ...
Chlorophenoxy herbicides are a subclass of phenoxy herbicides which includes: MCPA, 2,4-D, 2,4,5-T and mecoprop. [1] Large amounts have been produced since the 1950s for agriculture. [ 2 ]
One major complication to the use of herbicides for weed control is the ability of plants to evolve herbicide resistance, rendering the herbicides ineffective against target plants. Out of 31 known herbicide modes of action, weeds have evolved resistance to 21. 268 plant species are known to have evolved herbicide resistance at least once. [ 59 ]
Post-emergent herbicides (4 P) Preemergent herbicides (18 P) S. Sulfonylurea herbicides (5 P) Systemic herbicides (5 P) Pages in category "Herbicides"