In the row-crop business, we tend to think of herbicide resistance as being just a problem in cotton, grains, peanuts and similar crops. But resistance also has become a factor in orchard crops. Here's an overview of the problem in California's Central Valley and recommendations for dealing with it. It comes from David Doll, University of California Cooperative Extension Farm Advisor in Merced County.
As David writes in a late-December posting on his blog, The Almond Doctor, "Since herbicide resistant weeds are becoming more prevalent in the San Joaquin Valley (think Hairy Fleabane, Horseweed/marestail), it is becoming more important for growers to utilize practices that reduce the chance of herbicide resistance."
He also notes: "Glyphosate is one of the most widely used herbicides for this practice, and, until recently, has provided good control."
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