Black mold: Fungal sporangia on infected onion bulb
Pathogen: Aspergillus niger Symptoms The region below the neck blackens and clusters of black fungal spores from along veins and on or...
Black mold: Powdery fungal spores beneath dried skin.
Pathogen: Aspergillus niger Symptoms Below the dried skin a powdery, black mass of spores forms which is often invisible on the outside....
Black mold: Fungal spores on infected onion bulb
Pathogen: Aspergillus niger Symptoms Post-harvest black discoloration at neck; lesions on outer scales; black streaks under outer dry...
Black mold: Mold symptoms on onion bulb
Pathogen: Aspergillus niger Symptoms Post-harvest black discoloration at neck; lesions on outer scales; black streaks under outer dry...
Anthracnose: Fungus invasion on onion bulb
Pathogen: Colletotrichum sp. Symptoms Infected leaves are slender with clusters of dark spores on bulb appearing just like on the leaves....
Purple blotch: lesion on the neck region of an onion plant.
Pathogen: Alternaria porri Symptoms When bulb infection occurs, it is normally through the neck. If the fungus invades the bulb, lesion...
Purple blotch: Early leaf symptoms of onion
Pathogen: Alternaria porri Symptoms Older leaves tend to be more susceptible than younger leaves. Symptoms begin as water-soaked lesions...
Purple blotch: Foliar lesions due to infection
Pathogen: Alternaria porri Symptoms Older leaves tend to be more susceptible than younger leaves. Symptoms begin as water-soaked lesions...
Purple blotch: Expanding brownish-purple lesion showing concentric rings of sporulation.
Pathogen: Alternaria porri Symptoms Older leaves tend to be more susceptiblethan younger leaves. Symptoms begin as water-soaked lesions...
Purple blotch: Brownish-purple foliar lesions.
Pathogen: Alternaria porri Symptoms Older leaves tend to be more susceptiblethan younger leaves. Symptoms begin as water-soaked lesions...