The downy mildew that killed your impatiens did not attack those plants. Lack of moisture from the drought is more likely the culprit. Check the Pachysandra for scale - little brown bumps on the stems and leaves. If you find it, here is how you treat it. Apply horticultural spray oil, such as neem, labeled for use on euonymus scale according to label directions. Apply in late May through June. Second generation crawlers may require treatment from late July through early August. Repeat applications may be necessary. Be sure to spray the under sides of the leaves. Best And Happy Yardening, Nancy.