Dr. Phyto

zinnia

Zinnia elegans

Diseases & pests on this plant

• powdery mildew (ornamentals)Golovinomyces sp.

  A white-to-grey powdery coating spreads over the upper leaf surface, shoots and flower buds; under it the tissue yellows, and young leaves may pucker, curl or be stunted; severe attacks brown and shrivel the leaves. Unlike downy mildew the growth is on the UPPER surface and rubs off; worst in warm days with cool, humid nights and crowded, shaded plants.

• grey mould (Botrytis)Botrytis cinerea

  Fuzzy grey mould on leaves and stems.

• two-spotted spider miteTetranychus urticae

  Yellow stippling on upper leaf surface, fine webbing.

• sclerotinia stem rotSclerotinia sclerotiorum

  White cottony growth on stems at flowering height, stems split open to show black sclerotia (1–5 mm) embedded in pith, premature ripening of affected plants.