Why Do Welsh Onions Die? Cause Analysis and Control Measures
Welsh onion is one of the common vegetables, tolerant of drought and highly adaptable, and it is cultivated all over the country. However, plant death often occurs during cultivation, bringing economic losses to farmers. So what causes Welsh onion plants to die? How should it be controlled? Let's take a look.
I. Causes of Welsh Onion Death
1. High humidity
The leaf surface of Welsh onion has a waxy layer that mainly prevents water loss, so transpiration is low. In summer and autumn, there are many rainy days and high air humidity, which inhibits leaf transpiration, so the absorption capacity of the root system weakens and the nutrients absorbed are greatly reduced. When the plant lacks nutrients, it will die, and this will also worsen the severity of diseases, leading to more dead plants.
2. Diseases
Due to many years of continuous cropping on the same land, soil-borne diseases are relatively serious, causing a large number of diseases such as soft rot, Fusarium wilt and root rot. In addition, moist soil worsens the condition and causes more plants to die.
3. Insect pests
Because wheat straw and wheat husks are soaked and burned in the field, a large number of scarab beetles survive after laying eggs in the soil. In this case, pest control should be strengthened, but many farmers neglect the reproduction of insect pests, leading to underground pests multiplying and biting many plants to death.
II. Control Measures
1. Reasonable crop rotation
When planting, choose soil rich in organic matter, with deep soil layers, high and dry terrain, and good drainage. The first crop should not be onion-type crops. Apply sufficient base fertilizer while preparing the land, then make beds or ridges, and promptly spray disinfectant agents and New High-fat Film to disinfect and sterilize the soil.
2. Reasonable planting
Planting should be carried out strictly according to the requirements, with reasonable close planting. At the same time, do a good job in earthing up and seedling recovery management, and spray New High-fat Film to preserve internal soil moisture, prevent external waterlogging, maintain fertilizer efficiency and promote new root growth. Also drain water in time to avoid root rot and plant death caused by water accumulation in the field.
3. Strengthen management
At the stage when Welsh onions are dying, supplement fertilizer and water in time, especially elements such as nitrogen, phosphorus, potassium and calcium. Pay particular attention to promoting roots, strengthening plants and increasing yield through earthing up. During the white stalk formation period, spray Diguo Zhuangdiling so that the transport ducts of underground fruits become thicker, improve the expansion vigor of underground roots and stems, and achieve high quality and high yield.
4. Pest and disease control
The diseases of Welsh onion include downy mildew, black mold and purple blotch, and the pests include leaf miners and root maggots. Spray targeted control agents, plus New High-fat Film, to improve the utilization rate of pesticides. At the same time, it can enhance disaster resistance, reduce the amount of chemical pesticides and fertilizers, and lower pesticide residues.
The above is an introduction to the causes of Welsh onion death and control measures. We hope it can help you. To learn more related knowledge, please stay tuned to us.