What are the latest control methods for common diseases of Asarum?
Asarum is a relatively precious medicinal herb. With the expansion of demand for it, together with the development of under-forest economy, its artificial cultivation has developed rapidly, and the planting area is growing larger and larger, making it one of the main economic industries in many rural areas. Although Asarum is a medicinal herb, it is still harmed by diseases during cultivation. When the diseases are severe, they can deal a devastating blow to it and affect the development of Asarum production. Below, the editor brings several common disease control methods for Asarum. Let us learn about them together.
1. Asarum blight
Blight mainly harms the leaves and petioles of Asarum. When the disease occurs, water-soaked dark green round lesions appear on the leaves. When humidity is relatively high, a large amount of white mold-like substance appears on the lesions. Under high temperature and high humidity conditions, this disease spreads at an extremely fast rate, finally causing the petioles to soften and fall over, and the leaves to rot and die.
Control methods: Reasonable crop rotation, strengthen ventilation and drainage measures during planting. After diseased leaves appear, remove the diseased leaves in time. If localized infection occurs, spray 600 times diluted amobam solution or 75% chlorothalonil 600 times diluted solution for control.
2. Asarum rust
Rust also harms the leaves and petioles, and some also harms flowers and fruits. It is a bacterial disease. The pathogen spores parasitize on the leaves. In the early stage, there are mound-like protrusions on the leaf surface. In the later stage, the spores rupture, and a large amount of white powder appears. As the disease develops, it turns yellow-brown and chestnut-brown. In color, it is somewhat like rust. When the disease is severe, the leaves completely wither and die.
Control methods: In autumn, thoroughly clean the garden, pull out the diseased and residual plants, take them out of the field and burn them, which can reduce the pathogen. When the disease occurs, remove the diseased leaves, and also spray pesticides such as triadimefon and sodium dimethyldithiocarbamate for control.
3. Asarum damping-off
Damping-off mainly harms the base of the stem. The pathogen invades the young stem and continuously expands along the stem. After the stem base is infected, yellow-brown lesions appear, finally causing the stem base to rot. Because the transport tissue is cut off, the plant gradually wilts and dies.
Control methods: Reasonable crop rotation. After autumn harvest, deep-plow the diseased and residual plants into the soil. During the rainy season, open ditches in time for drainage to reduce field humidity. At the same time, also prevent high temperature and strong light exposure, so as to avoid sunscald causing wounds and giving the pathogen an opportunity. When the disease occurs, spray hymexazol 2000 times diluted solution or 15% damping-off EC 500-1000 times diluted solution to irrigate the soil for treatment.
4. Asarum leaf blight
Leaf blight mainly harms the leaves, and also harms the petioles, flowers and fruits. When the leaves are infected, round lesions appear. The lesions have obvious concentric rings, and are light brown or brown. When the disease is severe, the lesions merge and perforate, causing the leaves to wither and die. When the petioles are infected, spindle-shaped black lesions appear, and the lesions are sunken. The lesions on flowers and fruits are round and dark brown. Under high temperature and high humidity conditions, brown mold-like substance is produced.
Control methods: Clean the garden in autumn, pull out and burn diseased plants in time, then spray mancozeb or copper sulfate for disinfection. In the early stage of the disease, spray iprodione and procymidone for control.
The above are common disease control methods for Asarum. We hope they can help you. To learn more about medicinal herb cultivation knowledge, please stay tuned to us.