- Author: Carol A Frate
Published on: June 28, 2013
It’s not that I am unpatriotic, but in this context “flags” refer to isolated dead alfalfa stems with dead leaves still attached that are surrounded by healthy stems. The “flags” are usually light colored and the tips are often curled over like a shepherd’s crook or staff.
“Flagged” stems can be caused by several pathogens but when they appear in summer, are light tan in color and have the characteristic crook at the top, it is probably because the stem is infected with the fungus Colletotrichum trifolii (Figure 1). The disease this fungus causes is called anthracnose (it has also been called southern anthracnose). The most obvious symptoms...
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