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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 ...
Preemergence: Preemergence herbicides are applied before the weed seedlings emerge through the soil surface. Herbicides do not prevent weeds from germinating but they kill weeds as they grow through the herbicide-treated zone by affecting the cell division in the emerging seedling.
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.
Trifluralin is a common pre-emergent selective herbicide, a dinitroaniline.With about 14 million pounds (6,400 t) used in the United States in 2001, [3] and 3–7 million pounds (1,400–3,200 t) in 2012, [4] it is one of the most widely used herbicides.
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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