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Seedling of field bindweed (wild morningglory), Convolvulus arvensis.Cherry

Survey for Weeds—Late Spring

By surveying weeds in late spring, you can identify any species that escaped previous control attempts and determine which perennials are present. Ideally tree rows are weed free, whereas weeds growing in row middles can reduce water quality problems by preventing soil erosion and water and sediment runoff to creeks and streams. However, perennial weeds are problematic and should be kept from establishing in row middles.

How to survey your orchard

  • Survey your orchard in late spring or early summer, after summer annuals have germinated.
  • 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 for regrowth of perennials a few weeks after cultivation.
  • Sketch a map of the orchard 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).
  • Keep records (114 KB, PDF) of your survey results for future management decisions.

Survey information collected over a period of years tells you how weed populations change and how effective your management operations have been over the long term. Keep these records so that you can track weed populations from year to year to better understand ongoing weed control problems such as resistance.

Important links

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Statewide IPM Program, Agriculture and Natural Resources, University of California
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