Vinca Flower Diseases. The infection is generally characterized by leaf blight and upper stem deterioration. This fungal pathogen causes a major disease in vinca in the landscape but it can also be a serious disease of greenhouse-grown vinca.
Microorganism can move from one plant to another merely by leaftoleaf contactAlthough the disease is most destructive on the aboveground plant partsa root rot may also develop. Water well in drought vinca is prone to wilting. Vinca ground cover has been a popular landscape plant.
Branches and eventually the entire plant blackens at the base and dies.
Annual vinca is invincible to most pests but it can succumb to stem and root rot caused by Phytophthora a soil- and water-borne fungal-like microorganism. Diseases caused by Viruses. Diseases of Greenhouse Ornamental Crops. When soils are excessively wet fungal.