Verbena Diseases

Informational table showing disease name, symptoms, pathogen/cause, and management of Verbena diseases.
Verbena Diseases - Articles
Verbena Diseases
DiseaseSymptomsPathogen/CauseManagement
Botrytis BlightTan spots develop on leaves. Established plants rot at the crown. Infected tissue is covered with dusty gray fungal growth.Botrytis cinereaMaintain low humidity by spacing plants and venting to improve air circulation. Remove dead and dying flowers and leaves. To protect healthy plants, apply a fungicide.
Powdery MildewWhite fungal growth forms on the upper surface of leaves and may form on flower petals.Golovinomyces cichoracearum (formerly Erysiphe) or Podosphaera xanthii (formerly Sphaerotheca fuliginea). Note: This powdery mildew can attack cucurbits and verbena.Apply a fungicide to protect plants.
Pythium Root RotRoots are dark brown. Plants are wilted and yellowed.Pythium sp.Do not over-water plants. Pot in pasteurized media. Keep hose ends off the ground. To protect healthy plants, apply a fungicide.


Bacterial leaf spot

Authors

Gary W. Moorman, Ph.D.