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Dry Beans

field bindweed seedlingPostplant Weed Survey

Survey 4 weeks after planting but before cultivation to determine the spectrum of weeds present. Depending on the planting date and your location, it is possible that you will see winter annuals along with summer annuals.

The most problematic weeds in bean fields are bermudgrass, johnsongrass, nutsedge, and field bindweed. Weed control can also be difficult in fields heavily infested with certain annual weeds such as nightshade, groundcherry, and annual morningglory.

Recording weed survey results assists in weed management decisions, including herbicide choice and cultivation practices. Records from previous crops are also helpful to indicate which weeds may be in the seed bank and require control. Information collected over a period of years tells you how weed populations are changing and how effective your management operations have been.

How to survey

  • Walk through each field in a random pattern.
  • Rate the degree of infestation for each weed species on your weed survey form. Use either a numeric scale from 1 to 5 (1 being the lightest, 5 being the heaviest), or rate as "light," "medium," or "heavy."
  • Check fencerows, ditch banks, field edges, and wet spots as these may be problem areas for weed growth and potential sources for wind disseminated seed. Note the dominant species on the monitoring form.
  • Pay particular attention to perennial weeds.
  • Sketch a map of the field and mark areas with major weed infestations for follow-up control action, noting carefully the location of weeds producing seed.
  • Indicate the growth stage of the weed (seedling or mature).
  • Record results on a weed survey form (113 KB, PDF).

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