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Field bindweed (wild morningglory)Summer Weed Survey

By surveying weeds in late spring or early summer, you can identify summer species that escaped previous control efforts and identify newly emerging weeds; these weeds need to be controlled before they cause problems in the orchard or before they set seed.  Early summer surveys help in planning for postemergent weed management. If herbicides have already been used, the survey helps in determining the success of the treatment and identifying resistant populations.

Record your weed survey results (summer weed survey form107 KB, PDF). Keep these records to track weed population information from year to year to better understand ongoing weed control problems.

Weed identification

Identify common summer broadleaves and grasses and sedges.

How to survey your orchard

  • Survey your orchard in late spring or early summer, after summer annuals have germinated, to see which control treatments are needed.
  • Look for weeds that have escaped preemergent treatments or that need postemergent control.
  • Pay particular attention to perennials, weeds near trees, and border areas; sketch out a map of your orchard and note areas of concern.
  • If navel oranges might be exported to Australia, also look for favored weed hosts of bean thrips.
  • Keep records of your survey results. By knowing which species are present, you will be able to make appropriate decisions on cultural and chemical controls.

Information collected over a period of years tells you how weed populations may be changing and how effective your management operations have been.

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