Why does your Zinnia Dreamland F1 Ivory have white cottony spots? Diagnose the cause and fix it with our step-by-step guide.
Pet FriendlyThis is the most common fungal disease for Zinnias, especially in humid conditions. It presents as white, flour-like patches on leaves and stems that can eventually cause the foliage to wither.
These small insects secrete a white, waxy, cottony substance to protect themselves. They congregate in crevices and on the undersides of leaves, sucking sap from the Zinnia stems.
Certain scale insect species produce a white, fluffy covering that resembles cotton. They attach themselves firmly to the plant tissue and can lead to yellowing of the Zinnia foliage.