Farmers who have previously sprayed their fields with Acrobat, have seven days control from the date it was sprayed. After this time they need to follow up with a second application. Producers who have tobacco transplants left in greenhouses are strongly encouraged to spray these plants with Dithane, or better yet, destroy them. Some farmers forget about these plants, but they could become infected with blue mold even inside the greenhouse. If not discovered, such plants would continue to be a source of blue mold.
Blue mold is caused by an airborne fungus.
This disease has the ability to cause widespread damage to a tobacco crop. It can occur in greenhouses, plant beds and fields. At one time, Ridomil, a systemic fungicide, was considered the best control measure to prevent this disease. This means that farmers should use a protective fungicide even if they have used Ridomil. These spots rapidly multiply under favorable conditions.