Threshold concepts are critical in weed science as they help farmers and agronomists determine when weed control measures are necessary The concept of thresholds is based on the idea that there is a certain level of weed infestation beyond which crop yields are significantly impacted. Adopting economic threshold weed control farming practices typically reduces herbicide costs while maintaining profitability However, weed control thresholds have been challenging to establish as the results from competition experiments, on which thresholds are based, are almost always specific to species, site and season. For soybeans, the first four weeks through canopy closure is crucial Determine appropriate control methods and timing
Proper weed control requires a combination of one or more of the following control methods Chemical, cultural, mechanical, and biological. One of the keys to successful implementation of this new system of weed control lies in the ability of growers to determine when weed populations exceed economic threshold levels, thus requiring treatment.
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