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Pesticide Resistance Strategies and Tactics for Management (1986) / Chapter Skim
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Resistance to Weeds
Pages 327-334

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From page 327...
... The universal occurrence of weeds as constant components of the agricultural environment, as compared with the epidemic nature of other pests, delayed recognition of weed control in crop production. The first attempts to use selective herbicides to control broadleaf weeds in small grains, around the year 1900, were unsuccessful.
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From page 328...
... POTENTIAL PROBLEMS Many weed scientists see the changing weed spectrum as being the greatest challenge facing chemical weed control. Herbicides have successfully opened a niche in the weed ecosystem that a few weed species tolerant to herbicides are filling.
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From page 329...
... In North America large areas of atrazine-resistant weeds have appeared in the intensive corn area of Ontario, Canada, and in the mid-Atlantic states, particularly Maryland. Weed resistance has been confirmed in at least six classes of herbicides, the most recent being the emergence of a resistant biotype of goosegrass (Eleusine indica)
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From page 330...
... CONTROL Control techniques that can be used to prevent weeds from becoming dominant and to reduce the seriousness of resistant populations include herbicide mixtures, herbicide rotation, crop rotation, and increased cultivation. Some of these measures will be more costly than current programs.
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From page 331...
... Herbicide rotation greatly reduced the soil seed bank by preventing seed production, while the continuous use of the same herbicide allowed tolerant species to increase soil seed numbers. In this study the continuous use of atrazine over a 10-year period allowed annual grasses to increase rapidly, but greatly reduced the broadleaf population.
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From page 332...
... reported a 96 percent decline in the soil seed bank after six years in a crop-herbicide rotation study and a 98 percent decline in a continuous corn system. Crop Rotation Crop rotation is an important strategy that can delay the development of resistance and reduce resistant weed populations.
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From page 333...
... Chemical rotation is critical for these areas, since there are a limited number of herbicides available for use along railroads, industrial sites, and highways. Excellent progress has been made in reducing and even eliminating grass mowing on many highways.
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From page 334...
... 1958. Crop rotation and associated tillage practices for controlling annual weeds in flax and reducing the weed seed population of the soil.
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Key Terms

  • crop rotation
  • herbicide rotation
  • weed resistance
  • weed species
  • continuous corn

  • soil seed
  • row cultivation
  • weed seeds
  • weed spectrum
  • weed seed

  • herbicide treatment
  • seed bank
  • herbicide treatments
  • greatly reduced
  • crop production

  • single herbicide
  • control weed
  • irrigated soil
  • rapid changes
  • resistant weeds

  • percent decline
  • chemical weed
  • prevent rapid
  • weed escapees
  • postemergence herbicides

  • seed decline
  • weed management
  • increased cultivation
  • cultural practices
  • resistant weed


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