What causes dead Welsh onion plants in summer and autumn
Why do Welsh onions die in summer and autumn? Please explain the causes. Other causes of Welsh onion death: 1. Air humidity too high. The surface of Welsh onion leaves has a layer of wax, which prevents water loss and keeps transpiration relatively low. In summer and autumn there are more consecutive rainy days, and the air humidity is relatively high, which suppresses transpiration. Therefore the root...
Why do Welsh onions die in summer and autumn? Please explain the causes
Other causes of Welsh onion death:
1. Air humidity too high. The surface of Welsh onion leaves has a layer of wax, which prevents water loss and keeps transpiration relatively low. In summer and autumn there are more consecutive rainy days, and the air humidity is relatively high, which suppresses transpiration. Therefore the absorption by the root system decreases, and the nutrient elements - nitrogen, phosphorus, potassium, calcium, magnesium, sulfur, zinc and other fertilizer elements - carried to the leaves through water uptake are also greatly reduced. Long-term lack of fertilizer elements can also cause dead plants, and aggravates the occurrence of diseases, causing death from disease.
2. Severe diseases. Due to many years of continuous cropping, soil-borne diseases are severe, causing large outbreaks of soft rot, fusarium wilt and root rot. Combined with excessive soil moisture, the harm from diseases is even more aggravated, so very many plants die from disease.
3. Severe insect pests. In the past two years, burning wheat straw and wheat husks in the fields has been prohibited, and large numbers of scarab beetles lay eggs and survive in the wheat husks. Under these circumstances, trapping and killing adults should be strengthened, and pesticides should be sprayed early to eliminate the larvae. Many vegetable growers neglect pest control, resulting in severe outbreaks of underground pests such as white grubs, which bite many plants to death and also aggravate the harm from diseases.
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