White Stuff On Milkweed Plant. When it comes to diseases that may befall your plants powdery mildew tops the list as one of the most common culprits. The classic sign of a mealybug infestation is tiny white bugs on plants.
Thin out the herd if your milkweed plants are crowded your milkweed patch can become a breeding ground for fungi. Mated females deposit eggs on milkweed stems near the ground or below the soil line. Red milkweed beetle larvae develop and overwinter within the roots of the milkweed plants and pupate in the spring.
Powdery mildew is a serious fungal disease that attacks a wide range of plants from squash to roses.
Thin out the herd if your milkweed plants are crowded your milkweed patch can become a breeding ground for fungi. While almost no type of plant is immune certain species are more susceptible than others including lilacs flowering crab apple trees phlox red bee balm plants roses squash cucumbers and more powdery mildew fungi can be found anywhere but it thrives particularly well. Mated females deposit eggs on milkweed stems near the ground or below the soil line. The symptoms are unmistakable.