First, the symptoms: lettuce black spot disease, also known as ring disease or leaf blight, the disease mainly damage the leaves. The typical symptom is the formation of round or near-circular brown patches on the leaves, 3 to 15 mm in diameter, with concentric ring veins. When the lesions are wet, the back of the lesions can produce black moldy, and later lesions cover the entire leaf.
Second, control methods: to strengthen the cultivation and management, increase phosphorus, potassium fertilizer. Rotation is carried out to remove old, sick and leaves in time. At the early stage of disease, the following fungicides or formulas can be used for prevention and treatment: 10% difenoconazole water dispersible granules 1500 times liquid + 75% chlorothalonil WP wet 600; 25% chlorfluzuron EC 1000-2000 times Liquid + 70% mancozeb WP 700 times; 25% Prochloraz EC 800 ~ 1000 times + 75% chlorothalonil wettable powder 600 times; 25% Bromocronitrile WP 500 ~ 1000 Diluent+75% chlorothalonil wettable powder 600 times; 25% azoxystrobin suspension 1000 to 2000 times liquid; 77% copper hydroxide wettable powder 800 times; 47% chloramphenicol oxychloride Wet powder 600 to 800 times; 50% iprodione suspension 1000 to 2000 times liquid, even spray, depending on the disease 7 to 10 days spraying once.
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