Onion yellow dwarf: Stunting of plants
Pathogen: Poty virus Symptoms Severe stunting of plants, dwarfing and twisting of flower stalks. Leaves are sometimes crinkled and...
Onion yellow dwarf: Bending of leaves
Pathogen: Poty virus Symptoms The affected leaves and stems change their normal green colour to various degrees of yellow and leaves tend...
Onion smut: Stunted growth of plant
Pathogen: Urocystis colchici and U. cepulae Symptoms Affected leaves may bend or twist abnormally and usually are shed prematurely....
Onion smut: Affected leaves with smut
Pathogen: Urocystis colchici and U. cepulae Symptoms Infected seedlings often die within six weeks of emergence. Dark areas can be seen...
Onion smut
Pathogen: Urocystis colchici and U. cepulae Symptoms When the plant grows lesions form on the leaf and any bulbs that form will be...
Onion smut: Seedlings infected with smut
Pathogen: Urocystis colchici and U. cepulae Symptoms Infected seedlings often die within six weeks of emergence. Dark areas can be seen...
Onion smut: Onions infected with smut
Pathogen: Urocystis colchici and U. cepulae Symptoms When the plant grows lesions form on the leaf and any bulbs that form will be...
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...