1. Leaf spot (mainly including brown spot and black spot) Brown spot is round, dark brown, larger, yellow halo around the outer edge of the lesion, gray mold in the late stage, black spot disease The spots are round, dark brown, and there are no yellow halos around the lesions. Lesions are smaller than brown spots. Control methods: rational rotation; selection of disease-resistant varieties. High-temperature and rainy July and August is the key period for controlling leaf spot disease. When the diseased leaf rate reaches 10% at the early stage, it can spray 50% carbendazim 800 times solution or 70% mancozeb manganese 800 times every 15 days. Spray once, spray 2 or 3 times.
2. Flower rust disease. The bottom leaves first began to occur. The leaves had yellow spots, small shapes, and a very narrow yellow halo around them. After the epidermis was cracked, rust-colored powders were scattered. In severe cases, the leaves were yellow and dry off. Control methods: At the beginning of the disease, spray 75% chlorothalonil 600 times solution or 20% triadimefon 500 times solution.
2. Flower rust disease. The bottom leaves first began to occur. The leaves had yellow spots, small shapes, and a very narrow yellow halo around them. After the epidermis was cracked, rust-colored powders were scattered. In severe cases, the leaves were yellow and dry off. Control methods: At the beginning of the disease, spray 75% chlorothalonil 600 times solution or 20% triadimefon 500 times solution.
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