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My Phlox Are Turning Yellow From the Bottom Up
- Leaf blight occurs when older stems are no longer able to provide enough water to the tips of the leaves. This disease starts on the lower leaves and moves upward until the whole shoot dies. Leaf blight isn't caused by any kind of infection, but seems to be caused by a water imbalance in the plant.
- Powdery mildew is a fungus that causes white or grayish spots of a powderlike growth. It's usually seen on the topside of leaves but can also appear on the bottom sides of leaves or on the flowers, fruits and stems. Infected leaves turn yellow and fall off prematurely. This infection is common in damp, shady areas or where plants are crowded.
- Nitrogen encourages root growth and helps the plant take in other nutrients. Plants with a nitrogen deficiency develop pale, yellowish-green leaves and spindly stems.
- Nematodes are microscopic worms that live in the soil. They can damage phlox roots, causing the leaves to wilt, yellow and drop. New leaves that grow are smaller, fewer and weaker. Roots may be stunted and decayed.