Other viruses may result in dwarfed, cupped leaves and witches'-brooms symptoms. Control of these diseases is focused on prevention since once plants are infected, they cannot be cured. It is important to eliminate and remove infected plants as soon as they are recognized and to eliminate other symptomatic plants since these viruses usually have very broad host ranges. It is also helpful to place petunias at some distance from other solanaceous plants such as tomato, flowering tobacco, potatoes, eggplant, and peppers to further reduce the chances of infection. It is also critical to manage insect populations.
Symptoms can appear as black ringspots or blotches on the leaves.
This virus is transmitted by the western flower thrips. Control of this disease is focused on prevention since once plants are infected, they cannot be cured. It is important to eliminate and remove infected plants as soon as they are recognized and to eliminate other symptomatic plants since this virus has a very broad host range. It is also critical to manage the thrips population. Insect Problems Greenhouse orthezia.