Onion smut: Streaks on bulb
Pathogen: Urocystis colchici and U. cepulae Symptoms Dark areas can be seen first on cotyledons soon after their emergence from soil. On...
Onion smut: Powdery mass of fungal spores on bulb
Pathogen: Urocystis colchici and U. cepulae Symptoms Mature lesions contain a black, powdery mass of spores. On older plants raised,...
Onion Smudge: Dark spots on infected bulb
Pathogen: Colletotrichcum circinans Symptoms Over the surface of the bulb on the outer scale, masses of minute stromata form beneath the...
Onion Smudge: Concentric rings on infected bulb
Pathogen: Colletotrichcum circinans Symptoms It is not very common in India. On the outer bulb scales, over the surface of the bulb,...
Onion Smudge: Concentric rings on infected bulb
Pathogen: Colletotrichcum circinans Symptoms On the outer bulb scales, over the surface of the bulb, masses of minute stromata form...
Onion Smudge: Blemishing dots on outer scale
Pathogen: Colletotrichcum circinans Symptoms Blemishing dots on outer the outer bulb scales of onion. On, over the surface of the bulb,...
Onion Smudge: Infected bulb
Pathogen: Colletotrichcum circinans Symptoms It occurs on white onion varieties and reduces the market value of the bulbs. The disease is...
Neck rot: Cooked appearance of bulb
Pathogen: Botrytis allii Symptoms Scales of diseased bulbs become soft and brown, giving them a ‘cooked’ appearance. Infected tissues...
Neck rot: Internal symptom characterized by tissue decay
Pathogen: Botrytis allii Symptoms Affected internal parts of the bulb are brown, water-soaked and spongy. Infected tissues gradually dry...
Neck rot: External symptom with fungal growth
Pathogen: Botrytis allii Symptoms A dense grey mould growth develops, producing huge numbers of spores. Masses small black sclerotia grow...