In herbicide resistance selection intensity is the degree to which weed control measures eg herbicides in a cropping system give a competitive advantage to a weed or crop biotype resistant to a particular herbicide. The evolution of herbicide resistance understanding its mechanisms characterisation of resistant weed biotypes development of herbicide tolerant crops and management of resistant weeds are described throughout the 36 chapters of this book. If a weed evolves resistance to a herbicide that herbicide has not lost all of its value as it still controls other weeds and growers often continue to use the herbicide in a program with another herbicide to control the resistant weed. One hundred and seven herbicide resistant weed biotypes have evolved in various locations around the world this includes 57 species 40 broad leaved weeds and 17 grasses with biotypes resistant to triazine herbicides and 50 species 33 broad leaved and 17 grasses with biotypes resistant to 14 other classes of herbicides. The latter issue is represented in the occurrence of weed population shifts the evolution of herbicide resistant weed populations and herbicide resistant crops becoming volunteer weeds another issue is the ecological impact that simple weed management programs based on herbicide resistant crops have on weed communities
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