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Seedling of puncturevineWalnut

Survey for Weeds—Late Spring

By surveying weeds in late spring, you can identify species that escaped earlier control efforts, and you will know which perennials are present and which summer annuals are emerging. If herbicides were used this information will help determine the need to switch herbicides.

Weeds in tree rows must be managed. Annual weeds in row middles may be beneficial but before shaking weeds must be managed to provide a clean and smooth orchard floor.

Record your weed observations in order to make weed management decisions. Keep these records so that you can track weed population information from year to year to better understand ongoing weed control problems such as resistance.

How to survey your orchards

  • Survey your orchard in late spring or early summer, after summer annuals have germinated.
  • If you use cultivation for weed control, monitor at least 2 weeks before you plan to cultivate.
  • Check the ground cover in row middles for perennial seedlings. Check for regrowth of perennials a few weeks after cultivation.
  • Sketch a diagram of the orchard and mark areas where perennials are found.
  • Indicate the growth stage of the weed on the form (seedling or mature).
  • Rate infestation either using a numeric scale from 1 to 5 (1 being the lightest), or using “light,” “medium,” or “heavy.”
  • Record your results (sample late-spring weed survey form114 KB, PDF).

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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