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Preemergent herbicides are a form of chemical weed control which prevent germinated weed seedlings from becoming established. In some areas of the world, they are used to prevent crabgrass from appearing in lawns. [1] Preemergent herbicides are applied to lawns in the spring and autumn, to prevent the establishment of weed seeds. They will not ...
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Glyphosate and related herbicides are often used in invasive species eradication and habitat restoration, especially to enhance native plant establishment in prairie ecosystems. The controlled application is usually combined with a selective herbicide and traditional methods of weed eradication such as mulching to achieve an optimal effect. [68]
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 ]
Ethofumesate is a pre- and post-emergence [1] herbicide used on sugar beets to control weeds, notably blackgrasses. UK registration in 2016 is planned for pre-emergence use on wheat as an auxiliary component of tank mix. [2] Ethofumesate is used in Australia, to control wintergrasses in turfgrasses, along fencelines and tree plantations.
Preemergence herbicides form the backbone of weed control programs. They do not control all weed seeds that may be present in a landscape, but they are effective for many of the most common weeds.
One other pre-emergent herbicide, Pendimethalin, also has post-emergent characteristics. It is used both to prevent germination of the same list of grassy weeds, also as a means of eliminating ...
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