Survey Weeds—Early Season
For wine and raisin grapes, survey vineyards in late spring or early summer. For table grapes in the San Joaquin Valley, survey in March; in the Coachella Valley, survey in January or February. Surveying can help determine the spectrum of weeds present. These surveys help in making decisions about herbicide choice 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 (sample 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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