The post Milkweed Leaf Problems: 11 Common Pests, Diseases (Butterfly Garden) first appeared on My Monarch Guide and is written by Dena Haines. As you plant and cultivate milkweed, you’ll find that there are some common problems. A healthy supply of milkweed leaves is important for both attracting monarchs and for raising them indoors. Common milkweed leaf problems include pests (like aphids, beetles, and milkweed bugs), powdery mildew, leaf spots (fungal and bacterial), rust, and cucumber ...