Neck rot: Fungus development in onion bulb
Pathogen: Botrytis allii Symptoms Small black sclerotia may develop on the outer scales around the neck. Bulbs are usually first affected...
Neck rot: Neck tissue infected in bulb
Pathogen: Botrytis allii Symptoms Shriveled neck tissues of infected bulbs. Bulb scales soften and turn brown. A gray mold grows on the...
Downey mildew: Pale spots on onion leaves
Pathogen: Peronospora destructor Symptoms Pale spots or elongated patches on leaves; gray-purple fuzzy growth on leaf surface; leaves...
Downey mildew: Pale yellow patches on leaf surface
Pathogen: Peronospora destructor Symptoms Gray-purple fuzzy growth on leaf surface; leaves turning pale then yellow; leaf tips...
Downey mildew: Patches on leaf surface
Pathogen: Peronospora destructor Symptoms Pale spots or elongated patches on leaves; gray-purple fuzzy growth on leaf surface; leaves...
Downey mildew: Brown patches on leaves
Pathogen: Peronospora destructor Symptoms Lesions progress to a pale yellow followed by brown necrosis resulting in collapse of the leaf...
Downey mildew: Field infections
Pathogen: Peronospora destructor Symptoms Field infections usually begin in small patches and progress rapidly throughout the field....
Downey mildew: lesions on leaves
Pathogen: Peronospora destructor Symptoms As the disease progresses lesions which are slightly paler than the normal leaf color, enlarge...
Downey mildew: Velvety coat on leaves
Pathogen: Peronospora destructor Symptoms Typically the first symptom observed is the brownish-purple velvet-like sporulation of the...
Damping off: Post emergence damping off
Pathogen: Fusarium sp. Symptoms Post-emergence damping off – The pathogen attacks the collar region of seedlings on the surface of soil....