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