Preemergence herbicide concepts for orchard crops
Cross post from the UC Weed Science blog 11-24-14. It’s that time of the year when we’re planning preemergence (aka “residual”) herbicide programs for orchard and vineyard crops in California. Typically, these are the herbicides that are applied in the fall, winter, or early spring BEFORE weeds emerge (preemergence) and they usually affect weeds as they germinate or are just beginning to emerge from the soil. [often, people mistakenly think these herbicides kill seeds or sterilize the soil which is not actually the case]. As you’re planning the specific program for the weed problems in your orchards and vineyards (or any site, really), I thought it would be a good time to review some of the concepts of residual weed control with preemergence herbicides. Hopefully the concepts and ideas presented in the following line drawings will help us think about what PRE herbicides can and can’t do, and how to best use them in the orchard and vineyard production system.
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