Control - Controlling Botrytis blight of foliage plants is particularly important during the winter months. Methods which improve foliage drying and reduce moisture condensation on foliage during the nights reduce the need for fungicide application. These include fans to circulate the air and facilitate rapid leaf drying, and heating and venting at sunset to reduce the amount of moisture in the greenhouse air. On some crops, Botrytis spores are more likely to become airborne and spread when the plants are handled. Plants with these symptoms are usually rare unlike those infected with a virus.
Distortion can also occur.
The reddish-purple coloration on some leaves is not normal for this coleus cultivar. If the number of off-type plants is high, a new source of plants should be found. Discard those that are found, but don't miss the opportunity for developing a new selection of the plant. This is one of the oldest ways for new plants to come into the commercial trade. Leaf drop is common under optimal conditions for disease expression.