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Tomato

Seedling of yellow starthistleWeed Survey—Preharvest

Conduct a survey immediately before harvest to determine the spectrum of weeds present for next year's planning records. Records from previous crops will indicate which weeds escaped control, thus possibly infesting future crops.

How to survey

Walk through each field in a random pattern, rating the degree of infestation for each weed species. Use either a numeric scale of 1 to 5 (1 being the lightest, 5 being the heaviest), or rate as "light," "medium," or "heavy."

  • Note the location of weeds producing seed as carefully as possible.
  • Check fencerows, ditch banks, field edges, and wet spots as these may be problem areas for weed growth.
  • Check areas around the field edges as these areas could be potential sources for wind-disseminated seeds.
  • Pay particular attention to perennial weeds.
  • Sketch a map of the field and mark areas with major weed infestations for follow-up control action.
  • Record results on a weed survey form (134 KB, PDF).

Important links

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