Question: What does the Vinca/Periwinkle plant
look like once it has been infected with the Aerial Phytophthora
fungus and is there anything you can do to help once you have
the fungus?
Answer: As can be seen from these images, the
stem turns black and the plant above the lesion will gradually
die. When you see this symptom on a plant you should remove it
from the bed and discard it in the garbage. You should not plant
the vinca until the weather gets hot (late May - June); you should
mulch around the plants to help prevent the soil particles where
the disease is residing from splashing up onto the plants; and
you should water the soil and never the plants.
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