Usually caused by reduced availability of iron in high pH soil. Correct site-related conditions, such as high soil pH, water logging and poor aeration. Leaves become thickened or fleshy galls that turn pale green or white. The entire blossom may become a fleshy gall covered with a whitish bloom. Correct site-related conditions, such as high soil pH, water logging and poor aeration.
Leaves become thickened or fleshy galls that turn pale green or white.
The entire blossom may become a fleshy gall covered with a whitish bloom. Usually, chemical control is not warranted. Pick off and destroy galled parts before they become white, if feasible. Reduce humidity around plants by increasing airflow and avoiding prolonged moisture on leaves. Some cultivars are more susceptible than others.