Q: Now that there are a lot of round spots on celery, whether it is leaf spot or spot blotch, how can we judge? How to prevent?
A: According to current temperature and humidity, both diseases of celery leaves may occur, but they are fundamentally distinguishable. Leaf spot and spot blight of celery mainly damage the leaves.
The celery leaf spot disease, also known as early blight, can be diseased at the seedling stage and the adult plant stage. The adult plants suffer from heavy damage, which mainly damages the leaves and can also harm the petioles and stems. When the plants are victimized, they first develop disease at the leaf margin and petiole and gradually spread to the entire leaf. When the leaves are damaged, they appear as yellowish-green water stains, and then they develop into round or irregular shapes. The lesion size is 2 to 15 mm. Gray-brown, the thinning of the diseased part of the internal tissue after necrosis was translucent, dark brown at the periphery, slightly bulging, with a yellow halo around the periphery. The lesions are not limited by the veins. When the lesions are severe, they expand and aggregate to form plaques, causing the entire leaves to yellow and die. Petioles and stems infected, lesions oval, size 3 ~ 23 mm, expanded into dark brown slightly concave strips, in severe cases, the plant lodging.
The celery spot blotch, also known as late blight, is mainly harmful to the leaves. The northern region is dominated by small spotted species and can also harm the petiole and stem. General old leaf first onset, after the development of new leaves, light greenish brown oily spots, size 0.5 ~ 2 ml, often multiple lesions fusion, the edge is obvious, the center was yellow-white or gray, the edge of many black particles There are often yellow halos outside the lesion. When the petioles or stems are victimized, dark circles of oily ovals are slightly sunken and lesions are formed, and the central dense black spots are formed.
Control method of celery leaf spot: 10% difenoconazole 1500 times + 70% thiophanate-methyl 600 times or 12.5% ​​myclobutanil 2000 times + 80% mancozeb 600 times or 12.5% Tebuconazole + 75% chlorothalonil 600 times, 5 to 7 days spray once, severe spray 3 to 5 days once, can effectively prevent the occurrence.
Control method of celery spot blight: 58% metalaxyl Mn-Zn 600 times or 64% Caustic soda Mn-Zn 600 times or 50% EB Al-Mn Zn 600 times, spraying once every 5 to 7 days, when serious 3 to 5 days spray once, can effectively prevent the occurrence of.
At the same time prevention and treatment: available 58% metalaxyl manganese zinc 600 times liquid +10% Difenoconazole 1500 times liquid agricultural activity 750 times or 50% phospine manganese zinc 600 times liquid +12.5 myclobutanil 2000 Double liquid + Jintai Long top dressing 600 times liquid or 72% cream urea Mn/Zinc 600 times liquid +12.5 Tebuconazole 2000 times liquid + Cuoxiao Wang 600 times liquid, spraying once every 5 to 7 days, alternating use can effectively control.
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