How to control the disease of scallion seedlings

February 18, 2023

In the most recent period, the onion seedling stage suffered serious diseases. On these two days, some farmers in Zhangqiu, Jiaozhou and Pingdu called on the phone. The continuous rainy weather and the high temperature after the rain showed that the scallion dead seedlings, dry tips, and yellow leaves were particularly serious. How to prevent?

During the nursery period, green onions are most likely to suffer from damping-off, which is directly related to soil, seed and management levels. First of all, seedbeds should be selected within three years of soil seedlings not planted onions, loose, fertile, flat terrain, drainage and irrigation of the best sandy loam. The optimum pH for growth of Welsh onion is 7.0-7.4. When the soil pH is below 5, it is not conducive to the growth of Scallion seedlings.

Seed disinfection is an effective means to prevent seedbed diseases. It can be soaked in 0.2% potassium permanganate solution for 25 minutes, and then rinsed with water to kill pathogenic bacteria on the seed surface. It can also be wrapped in clean gauze and placed at 50°C. Soak in warm water for 30 minutes. Soaking constantly shaking, so that the seeds heat evenly. After soaking, wash it with water and then soak in water at 20-30°C for 2 hours. Before the seeding, the seedlings were sprayed evenly with Peliden's liquid organic fertilizer, and the soil was sowed after sowing.

Prone to downy mildew or epidemic disease on cloudy or rainy days. The main symptoms are dry yellow leaves. To prevent the disease from happening, you can directly spray the seedlings and spray onion seedlings with Peliden Liquid Organic Fertilizer, once for 5 days. Spray 2-3 times. For severe cases, use the United States Predon liquid organic fertilizer 200 times +72.2% Propazine (72.2% Prokary) 600 times liquid or hymexazin 800 times spray roots, continuous use 2-3 Times can control the condition

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