How does green onion new leaf have white spot dry leaf to bend atrophied to do?

How does green onion new leaf have white spot dry leaf bend atrophy to do? Please introduce that there are many diseases and insect pests that cause dried yellow leaves of green onions, such as downy mildew, gray mildew, blight, virus disease, seed fly and so on. Since the drugs used to treat downy mildew, gray mildew and blight have no effect, green onions are most likely to get virus diseases and be harmed by seed flies, which can be prevented and treated according to specific symptoms. The symptoms of virus disease are as follows: yellow and green mottled or yellow stripes of different length appear on the leaves, the leaves twist and become thinner, the leaf tip gradually yellowed, when the disease is more serious, the growth of Welsh onion slows down or stops dying of the whole plant. In the early stage of the disease of Welsh onion, 1.5% Zhi Jianling emulsion 1000 times solution 20% morpholine guanidine hydrochloride. Copper acetate wettable powder 500 times liquid 10% mixed fatty acid emulsion 100 times liquid spray control, interval 7: 10 days, spray 2 times 3 times. Seed fly harm: the larvae drill string Welsh onion rhizome underground, causing the underground part to rot and mildew, the aboveground part wilting, the leaf tip withered and yellow or the whole plant leaf yellowing. In serious cases, Welsh onion stops growing or even dies. 3000 times of chlorpyrifos EC, 3000 times of phoxim EC, 3000 times of 48% chlorpyrifos EC and 3000 times of 5% flurosemide EC can be used to control the harm of seed fly larvae. Click to get more green onion planting techniques click to get more vegetable planting techniques