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Symptoms of aster yellows disease on periwinkle, caused by a plant-pathogenic phytoplasma.

Symptoms of aster yellows disease on periwinkle, caused by a plant-pathogenic phytoplasma.

Symptoms of yellows disease and decline and dieback on an endemic Hawaiian plant (Dodonea sp.)

Healthy Dodonea plant without yellows disease.

Definition

Yellows is a plant disease characterized by chlorosis and stunting of the host plant.

Etymology (yellow). O.E. geolu, geolwe, from P.Gmc. *gelwaz (cf. O.S., O.H.G. gelo, M.Du. ghele, Du. geel, M.H.G. gel, Ger. gelb, O.N. gulr, Swed. gul "yellow"), from PIE *ghel-/*ghol- "yellow, green".