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A 2013 Missouri survey showed that multiply-resistant weeds had spread. 43% of the sampled weed populations were resistant to two different herbicides, 6% to three and 0.5% to four. In Iowa a survey revealed dual resistance in 89% of waterhemp populations, 25% resistant to three and 10% resistant to five.
The Herbicide Resistance Action Committee (HRAC) classifies herbicides by their mode of action (MoA) to provide a uniform way for farmers and growers to identify the agents they use and better manage pesticide resistance around the world. [1] [2] It is run by CropLife International [3] in conjunction with the Weed Science Society of America ...
LibertyLink provides an herbicide resistance system that is still effective in the presence of glyphosate resistant weeds. [1] The gene which gives resistance to glufosinate is a bar or pat gene which was first isolated from two species of Streptomyces bacteria .
One major complication to the use of herbicides for weed control is the ability of plants to evolve herbicide resistance, rendering the herbicides ineffective against target plants. Out of 31 known herbicide modes of action, weeds have evolved resistance to 21. 268 plant species are known to have evolved herbicide resistance at least once. [ 59 ]
A glyphosate-resistant weed has been found in the UK for the first time in what comes as another headache for British farmers. Glyphosate is the most effective herbicide for clearing vegetation ...
The study found that herbicide-tolerant crops have lower production costs, while for insect-resistant crops the reduced pesticide use was offset by higher seed prices, leaving overall production costs about the same. [3] [105] Yields increased 9% for herbicide tolerance and 25% for insect resistant varieties.