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Different Species of Canarygrass Identified Here (April 13, 2016)
Littleseed Canarygrass (Phalaris minor) is one of the most common winter annual grasses found here. It is common in both field and vegetable crops. It is normally controlled with both preemergence and postemergence herbicides. There are 7 species of canarygrass that can be found in the western U.S. but littleseed canarygrass is the only one that has previously been widespread here in the low desert. Dan Fox from the Dune Co. recently identified a different species, Hood Canarygrass (Phalaris paradoxa) in the Gila Valley. It is similar but can be easily distinguished in the field. When Littleseed canarygrass is at the seedling growth stage, the leaves are thin and exude a red fluid when broken. Hood canarygrass has a broader leaf that resembles wheat and does not “bleed” when broken. At later growth stages, Hood has a longer seedhead and the panicles are enclosed by an enlarged leaf. Although littleseed canarygrass that is resistant to the ACcase inhibitor herbicides such as clethodim (Select) and sethoxydim (Poast) can be found in the Imperial Valley, resistance to these herbicides is more common in Hood Canarygrass. Multiple applications of both of these herbicides were made to the field where Hood was found with little effect. We can assist you in identifying these weeds if you send email us a picture or drop some off at the Yuma Agriculture Center.

Before heading.

Phalaris paradoxa

Hood canarygrass is on the right.

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For questions or comments on any of the topics please contact Marco Pena at the Yuma Agricultural Center.
College of Agriculture, The University of Arizona, Tucson, AZ.

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