Post emergent weed control is
This page details Selective Herbicides.
Systemic herbicides work by the chemicals first being sprayed on the weed. The weed absorbs chemicals and is transported throughout the tissue, roots and all.
These chemicals attack only the weed that they are placed on and not threatening any surrounding vegetation.
The process is not instant. Depending on the chemical used, it can take hours up to a week for the weed to break down. It can be effective on both annual and established perennial weeds. This systemic process uses selective herbicides.
The weed group types that selective herbicides target
are Dicots, Monocots and Sedges.
Herbicides used for the Monocot grasses will
NOT be effective on Sedges.
Even with the use of selective herbicides it should be noted that this method of post emergent weed control has drawbacks...
Many times these targeted weeds can grow back larger and more challenging. It is recommended that you rotate different chemicals rather than using the same one over and over again. Please note, however, soils lose important microbes while weeds are becoming more resistant to these chemicals.
Soil Testing Methods -
Soil also matters when it comes to control - both
pre-emergent and Post emergent weed control.
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