How to do purple spot disease on onion planting? Recently, some farmers gave us a message saying that purple spot disease appeared when planting onions last year. I am afraid that this situation will occur again this year. Consult us about the prevention and treatment of onion purple spot disease. Xiaobian consulted on this issue. Relevant technical experts have summarized the prevention and treatment methods of these onion purple spot spots and hope to help everyone.
Onion purple spot disease mostly occurs in warm winter, which is more harmful. Onions, green onions, garlic, and leek can all be infected. Symptoms of purple spot disease occur first from the tip of the leaf. The initial lesion is small, gray to light brown, with a slightly purple central color and a black-gray mildew. The lesion quickly expands into an elliptical or spindle shape, with a concave, dark purple color, forming a concentric pattern with a yellow halo around it. When the humidity is high, the lesions are enlarged to the whole leaf, and the onion leaves are often yellowed or broken from the bottom to the top, which seriously affects the yield and quality of the fresh onions.
For the prevention and treatment of onion purple spot disease, we must first do a good job of cleaning, remove infectious sources such as sick bodies, strengthen management, apply more base fertilizer and top dressing, make onions grow stronger and strengthen disease resistance. After the onset, it is necessary to control the irrigation to reduce the soil moisture and prevent the Hummer from being prevented from causing wounds. If purple spot disease occurs during planting, apply a proper amount of spray.
The seed dressing can be carried out by using 50% thiram, 50% carbendazim or 50% thiophanate wettable powder at 0.4% by weight of the seed. In the early stage of the disease, it can spray 75% chlorothalonil WP, 64% chlorpyrifos WP, 70% mancozeb, 40% Dafudan WP, 58% metalaxyl Mn-Zn for 500 times. Or 50% chlorhexidine WP is 1500 times water. If the onion and the horse are at the same time, the above pesticides can be mixed with 2.5% deltamethrin or 20% chlorpyrifos to treat the onion horse.
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