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Dry
Beans
> Year-Round IPM Program > Stand
Establishment > Weed
Survey
Dry Beans
 Postplant Weed
Survey
Survey 4 weeks after planting but before cultivation to determine
the spectrum of weeds present. Depending on the planting date and
your location, it is possible that you will see winter
annuals along with summer
annuals.
The most problematic weeds in bean fields are bermudgrass, johnsongrass,
nutsedge, and field bindweed. Weed control can also be difficult
in fields heavily infested with certain annual weeds such as nightshade,
groundcherry, and annual morningglory.
Recording weed survey results
assists in weed management decisions, including herbicide choice
and cultivation practices. Records from previous crops are also
helpful to indicate which weeds may be in the seed bank and require
control. Information collected over a period of years tells you
how weed populations are changing and how effective your management
operations have been.
How to survey
- 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.
- Indicate the growth stage of the weed (seedling or mature).
- Record
results on a weed survey form .
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