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Related images: Spring Blackstem Leaf symptoms of spring black stem Stem symptoms of spring black stem Spring black stem lesion on petiole
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Entomology Image Gallery > Plant Diseases and Damage > Alfalfa > Spring Blackstem
Spring black stem lesion on petiole
Spring black stem lesion on alfalfa petiole.
This image appears in the following article:
Alfalfa problems appearing (June, 2002)