Survey Weeds—Dormant Period
By surveying weeds in late fall or winter, you can identify any species that escaped control from earlier management and know which perennials are present. If herbicides were used, surveying identifies any need for changing to another herbicide. Weed surveys help in selecting herbicides or cultivation equipment and practices.
Grapevines are most sensitive to weed or cover crop competition during the first few years of growth. As grapevines become established, competition from weeds is reduced because of the vine canopy shade. Weeds between the vine rows can be mowed or cultivated.
When using herbicides, record your weed observations (example weed survey form— ), and choose pre- and postemergent herbicides. Keep records to track weed populations from year to year to better understand ongoing weed control problems, such as resistance.
How to survey your fields:
Information collected over a period of years tells you how weed populations may be changing and how effective your management operations have been.
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