Start surveying your fields for weeds before harvesting the preceding
crop. Determine the dominant weed species present and maintain
records, noting the severity of their infestations.
Also, check weed infestations in adjacent fields.
Depending on when you monitor, you may see winter
summer annual seedlings,
weeds. Identifying what weeds are in your field will give
you the information you need to select herbicides, rotational
crops, and cultural practices.
How to survey your field
- 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. GPS records are useful
at this stage to identify areas of weed growth.
- Indicate the growth stage of the weed (seedling or mature).
results on a weed survey
form ( .
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