The symptoms of citrus powdery mildew appear as white mold on the positive and negative sides of the young leaves. Most of them are nearly round and have loose appearance. The mold often spread outward from the center. The leaf tissue below the mold layer was initially water-stained and later gradually lost its green color to form a yellow spot. In severe cases, lesions expand to the entire leaf, leaving younger leaves wither and older leaves distorted. In spring shoots, in the germination stage or in the early stage of disease, use 0.3-0.5 degree lime sulfur or 70% thiophanate WP 1000 times, spray once every 10 days, and spray 3 times. Agricultural control can strengthen the cultivation and management, increase phosphorus, potash and organic fertilizers to increase tree vigor and increase resistance to diseases. Combine pruning, cut branches and fruit that are too dense, and burn them to make them airy and transparent.
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