Disease control in Chinese chives should focus on prevention and good field management

Disease control in Chinese chives refers to the preventive and curative measures taken against the diseases that commonly occur during the growth of Chinese chives. Chinese chives are a perennial root vegetable, and after years of continuous planting in the same plot, pathogens tend to accumulate, so disease management should focus on prevention, combined with routine cultivation practices for integrated control.

The common diseases of Chinese chives mainly include gray mold, Phytophthora blight, rust, and sclerotinia rot. Gray mold mostly occurs under low-temperature, high-humidity conditions and is especially common in protected cultivation; white or grayish-brown spots first appear on diseased leaves, and a gray mold layer can be seen when humidity is high. Phytophthora blight mostly occurs in hot, rainy seasons and can damage leaves, false stems, and roots, with affected parts showing water-soaked soft rot. Rust appears as small orange-yellow raised spots on the leaf surface, and in severe cases the entire leaf is covered with rust powder.

Agricultural control is the foundational step. In production, crop rotation is recommended to avoid continuous cropping with onion and garlic crops; rational close planting to maintain ventilation and light penetration in the field; timely removal of diseased leaves and plant debris and carrying them out of the field for disposal; watering should be done in small amounts and more frequently, avoiding flood irrigation; in fertilization, attention should be paid to combining nitrogen, phosphorus, and potassium to prevent excessive nitrogen application that leads to lush, tender growth.

In protected cultivation, ventilation and dehumidification should also be strengthened to reduce humidity inside the shed, which can significantly reduce the occurrence of high-humidity diseases such as gray mold. In the early stage of disease onset, targeted pesticides should be selected for timely control, with attention to alternating medications to delay resistance, and the pre-harvest interval must be observed. In addition, if leaf tips dry out and turn yellow without mold layers or obvious lesions, it is mostly due to physiological causes such as unsuitable temperature and humidity or improper topdressing, and this needs to be distinguished from infectious diseases.