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Every crop possesses a critical period during which weeds should be controlled to prevent yield loss. Because so many factors can influence this critical period of weed control, a good rule of thumb is that the crop should be weed-free for the first four to six weeks following emergence to avoid yield loss. Read more on starting clean from this Mississippi Crop Situation article. is your source for ag news and information on crop pest identification, commodity and market prices, agricultural news & issues, and access to crop production management tools such as crop yield & planting calculators and herbicide, fungicide, and weed control information.