Survey after planting but before any management action to determine
the spectrum of weeds present. Records from previous crops help
determine which weeds may be in the seed bank and require control
Depending on planting date and location, you may see winter
annuals or summer annuals. In the Klamath Basin, both winter
and summer annuals may be present during the growing season.
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 beginning to flower so you
can control them before they set seed.
- Check fencerows, ditch banks, field edges, and wet spots
as these may be problem areas for weed growth.
- Check adjacent areas for weeds such as thistles that produce
- Pay particular attention to perennial
- 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 .