Aster yellows

Onion flower with unusual symptoms (left) compared with healthy inflorescence (right). Flowers are d

Infected plants with yellowish, malformed leaves.

Infected plant (left) with yellowing and stunting.

Kalanchoe with malformed inflorescences.

Daisy with stunted and malformed flowers.

Stunted diseased plant with small distorted flowers.

Small necrotic spots on lower leaves and red coalescing streaks on upper leaves.

Infection by this phytoplasm causes twisted awns and sterile florets.

Macrosteles sp., a leafhopper vector of aster yellows phytoplasma.

Flowers with phyllody (left and center). Healthy flower (right).