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The first case of herbicide resistance in Arizona has been documented. Bill McClosky,
U of A Weed Specialist, has confirmed the resistance of Palmer Amaranth to glyphosate.
A series of greenhouse tests were conducted in Tucson with seed that was collected
in cotton fields in the Buckeye area where pest control advisers became concerned.
This resistance was confirmed in Palmer Amaranth which is the most common pigweed
species in that region. Pigweeds are some of the most common summer annual broadleaf
weeds in the low deserts. Although they are often lumped together, there are 4 different
species of pigweed that are common here and more than 10 species that occur as weeds
in California and Arizona. Their growth habits and response to herbicides are similar.
It is easy to identify them by physical characteristics but one species of pigweed
can hybridize with another and become less distinguishable.
Click picture to listen to Barry To contact Barry Tickes go to:btickes@ag.arizona.edu. |
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For questions or comments on any of the topics please contact Marco Pena at the Yuma Agricultural Center.
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