Weeds have evolved resistance to 23 of the 26 known herbicide sites of action and to 166 different herbicides herbicide resistant weeds have been reported in 92 crops in 70 countries the website has 2732 registered users and 571 weed scientists have contributed new cases of herbicide resistant weeds. Herbicide resistance in weeds and crops is a collection of papers presented at the 11th long ashton international symposium in september 1989 the said symposium is held to study about the increasing incidence of herbicide resistant weeds and the consideration of the production of herbicide resistant crops. Weed resistance to herbicides is a normal and predictable outcome of natural selection in that context rare mutations that confer herbicide resistance exist in wild weed populations before any herbicide introduction. The best weed management strategy is to control weeds prior to the loss of crop yield potential and proactively delay the evolution of weed resistance. The evolution and widespread distribution of herbicide resistant weeds and their management is a challenge for crop producers and land managers
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