Rake up and destroy leaves and twigs from infected plants. On smaller plants, prune off and destroy all infected growth at the first sign of infection. Severe outbreaks may be prevented with periodic applications of chloro- thalonil or copper sprays. Read and follow all directions on the label. This disease, caused by the fungus Sphaceloma or Elsinoe euonymi-japonici , disfigures Japanese euonymus.
Spots develop on both surfaces of leaves but are most common on the upper one.
When they are numerous, the spots may merge together. The centers of the leaf spots sometimes fall out. On the stems, spots are similar to those on the leaves, but they are often darker in color and more likely to merge together. Rake up and destroy all fallen leaves and spray with thiophanate-methyl. Read and follow all directions on the label.