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(a) Healthy China aster. (b) AY‐WB‐infected China aster. Note the witches’ broom symptoms. (c) Macrosteles quadrilineatus, the leafhopper‐vector of AY‐WB. (Photos in A and B are reprinted from Zhang J., Hogenhout S.A., Nault L.R., Hoy C.W. and Miller S.A. (2004). Molecular and symptom analyses of phytoplasma strains from lettuce reveal a diverse population. Phytopathology, 94, 842–849. with permission of the journal.)
