How to effectively prevent and control yellowing leaves in Chinese chives

Chinese chives are a common crop in our daily lives. They are rich in nutrients and deeply loved by consumers. However, during cultivation, yellowing leaves in Chinese chives can occur, leading to serious yield reductions and even total crop failure in severe cases. So how should yellowing leaves in Chinese chives be prevented and controlled? Let's take a look together.

1. Yellowing leaves caused by diseases

Diseases that cause yellowing leaves in Chinese chives mainly include phytophthora blight and gray mold. After Chinese chives are infected with phytophthora blight, water-soaked lesions appear. In humid conditions, the lesions develop a white mold layer, and in dry conditions, they turn withered yellow. When gray mold occurs, white or light brown lesions appear on the leaves. As the disease progresses, the lesions gradually expand, ultimately causing the diseased leaves to dry up. In humid conditions, the diseased leaves develop a gray-green mold layer.

Prevention and control methods: The occurrence of phytophthora blight is related to drainage, so during cultivation, good drainage should be ensured to reduce humidity. When the disease occurs, it can be controlled by spraying with ridomil or metalaxyl mancozeb. For gray mold, in addition to reducing humidity through drainage, spraying with triadimefon and procymidone can also be used for prevention and control.

2. Yellowing leaves caused by pests

Pests include root maggots, onion flies, and late-eye fungus gnats. Root maggots bore into the bulbs to feed, and the damaged bulbs are attacked by the root maggots, causing the leaves to rot, turn yellow, and wither to death. Onion flies damage plants as larvae, gnawing on leaf tissue, causing leaves to turn yellow, become soft, and lodge. Late-eye fungus gnats do the same, sucking leaf sap, causing leaves to lose water, turn yellow, and die.

Prevention and control methods: For root maggots, roots can be exposed to the sun, wood ash can be applied, or phoxim granules can be mixed with soil and spread around the root system to kill them. For onion flies, during the larval stage, phoxim emulsifiable concentrate or quinalphos emulsifiable concentrate can be used as a root drench for control. During the adult emergence period, acetamiprid can be sprayed for control. Adult late-eye fungus gnats prefer shaded, humid places with abundant decaying matter, and can be trapped and killed using frequency-vibration insect-killing lamps.

3. Physiological diseases

Yellowing leaves in Chinese chives can also be caused by soil acidification, nitrogen poisoning, high temperatures above 35°C, and low temperatures, and can also be related to a lack of trace elements such as calcium, boron, and manganese in the plants.

Prevention and control methods: Apply acidic fertilizers as little as possible to avoid causing soil acidification. If the soil is too acidic, it can be adjusted with wood ash. When applying organic fertilizer, it must be fully decomposed. In summer, during high temperatures, water should be sprayed promptly to cool the plants, and in winter, good insulation measures should be taken. Before planting, apply base fertilizer, mainly organic fertilizer and farmyard manure, to provide the plants with a variety of essential nutrients. During the growing period, foliar spraying can be used to provide the trace elements the plants need.

The above is an introduction to how to prevent and control yellowing leaves in Chinese chives. We hope it can help you. If you want to learn more related knowledge, please stay tuned to us.