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Plant: Millet, German or Foxtail (Setaria italica) (Paniceae) Back to List Disease/Disorder: Gray leaf spot Causal agent: Pyricularia grisea (fungus) Signs: An olive-gray fungal growth can be seen in the middle of the spots. This is the production of conidiophores and conidia. Symptoms: elliptical spots with tan center and darker margin Total image number: 4
Plant: Reed canarygrass (Phalaris arundinacea) (Poaceae) Back to List Disease/Disorder: Zonate leaf spot Causal agent: Drechslera gigantea (fungus) Signs: Conidiophores and conidia can be seen within spots. Micrographs show stained portions of end cells and/or stained germ tubes. Symptoms: Tan round to lens-shaped spots with brown border. Total image number: 11
Plant: Alfalfa (Medicago sativa) (Fabaceae) Back to List Disease/Disorder: Summer black stem/leaf spot Causal agent: Cercospora medicaginis (fungus) Signs: Dark conidiophores and silvery conidia can be seen within spots. Symptoms: Leaf spots with brown center and darker border. Total image number: 14