Tomato leaf spot control

Science and Technology 110 Science and Technology Co., Ltd. QQ Group Netizen “Rhyme” Q: The back and front of the tomato leaves are yellow, but not long hair, and severe leaves dry. This is the disease? How to do?

Science and Technology 110 experts: According to the description, this is a tomato leaf spot disease, an outbreak in recent years, a disease, spread as fast as the yellow leaf curl virus disease. Its typical symptoms are: at the early stage of disease, the leaves are covered with dark round or near-circle small spots, and the posterior edges of the leaf veins are expanded to an irregular shape. The middle part gradually fades from gray to brown, and the lesions are slightly sunken and easily broken. Perforation or shedding.

Prevention methods: less nitrogen fertilizer to prevent leggy, re-application of phosphorus and potassium fertilizers and boron and calcium and other trace elements, removal of the lower old leaves, ventilation and lowering humidity. The agent can be selected from benzimidazole fungicides such as carbendazim and thiophanate-methyl, or organic sulfur fungicides such as thiram, mancozeb, etc., or triazole fungicides such as phenylether fluorosiliconazole, Propiconazole, or methoxy benzene acrylate fungicides such as azoxystrobin. It is advisable to spray the mixture with carbon dioxide (dobutacion Bromonitrile) 1000 times solution and Beijing Color (benzofenoxamate) 1500 times solution every 10 days for 2-3 times.

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