In addition to crepe myrtle, which other plant is known to be highly susceptible to powdery mildew?

Crepe myrtle is indeed highly susceptible to powdery mildew, which is a fungal disease that flourishes in warm, dry conditions and manifests as a white, powdery growth on the leaves. Euonymus, like crepe myrtle, is also susceptible to this fungal infection. The leaves of euonymus plants can develop similar powdery spots, especially under conditions that favor fungal growth, such as high humidity and poor air circulation.

Understanding that certain plants share susceptibility to specific diseases is critical for effective lawn and ornamental pest control. This knowledge helps in selecting resistant varieties when planning a garden or landscape, thereby minimizing the risk and impact of fungal diseases like powdery mildew. The other plant choices listed, such as lavender, ornamental grasses, and maple, do not typically exhibit the same level of vulnerability to powdery mildew as euonymus does.