Herbicides help reduce losses caused by weeds and save a lot of work. Herbicides are grouped by:

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• time of use (treatment, planting, sowing): preplant incorporated herbicides, pre-emergent herbicides, and post-emergent herbicides;

• type of application: soil-applied and foliar herbicides;

• scope of action: total (non-selective) and selective herbicides;

• mode of action: systemic or contact herbicides

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