As a general rule, Asclepias is a pretty much disease free plant. In general, if the yellow leaves on your plant are solid yellow and fall or pull away from the plant easily (depending on the plant type), you have under-watered at some point in the past. Surely you can match what you have to images already online. However, the structure of milkweed flowers is consistent, with … All of my milkweed plants have started turning yellow and wilting, then they die. It is important to remove and dispose of them at first appearance or they will quickly infest the … Also look on the underside of the leaves. If that is the case, tease the roots apart before or after soaking for an hour in Superthrive. Its flowers appear in the middle of summer, and it is hardy in USDA zones 4 through 9. The info below is all I could find regarding yellowing leaves and brown spots. They commonly infest oleander, common milkweed, swamp milkweed and butterfly weed. It’s spread by leaf hoppers which travel from plant to plant carrying the bacteria. TONS of images there. Oleander aphids are bright yellow with black legs, antennae, and cornicles (tail pipes) (Figure 2). A Dappled Willow Turning Yellow. Also watch for tiny caterpillars. A small, weeping tree, dappled willow (Salix integra) grows quickly to reach a height of 10 to 15 feet, depending on the variety. This behavior is known as flagging. I've found that most plants that need more water than makes sense are root bound and there's not enough soil. Phytoplasma or “milkweed yellows” is a bacterial disease that makes milkweed leaves turn yellow and look unusual. Monarch eggs are tiny, yellow little dots, and will be widely scattered. Although, the brown spots may be some form of insect damage. It’s best to trash affected stems and leaves or the entire plant, and not compost any diseased parts in order to prevent the spread. 5th instar Monarch larvae are voracious and quickly consume entire leaves. Q. Try pasting "which milkweed plants do monarchs breed on" into google, turn on images, and start looking. Chlorosis is a yellowing of leaf tissue due to a lack of chlorophyll. Milkweed flower color is variable across species and can be white, yellow, green, purple, pink, orange, or red. Common milkweed (Asclepias syriaca) is a North American native, growing in the United States and Canada. Like other species of aphids, their populations can explode in a short amount of time. RE: yellow leaves- try pulling the plant out of the pot and checking the rootball. In order to minimize the flow of the milkweed's sap, they will sometimes chew a notch in the leaf's petiole, causing the leaf to hang down. The bright yellow aphids found on milkweeds are destructive, non-native pests. 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