What are the common pest and disease control methods for Panax notoginseng
Panax notoginseng, also known as Sanqi, is a Chinese herbal medicine in our country. It has the effects of dissipating blood stasis and stopping bleeding, reducing swelling and relieving pain. Its blood-tonifying effect ranks first among Chinese herbal medicines, and its taste and functions are equal to those of ginseng, so it is named ginseng notoginseng. So what pests and diseases will harm Panax notoginseng during cultivation? Let's take a look at the detailed introduction.
1. Damping-off
Damping-off is the most common disease of Panax notoginseng. It is a fungal disease that mainly harms seeds, young buds and seedlings. When seeds are affected, they rot and exude milky white sap; when seed buds are affected, they turn dark brown until they die; when seedlings are affected, dark gray sunken lesions appear at the base of the stem, and in the later stage of the disease the seedlings collapse and die.
Control method: Before sowing, carbendazim can be used to disinfect and sterilize the soil. At the same time, the seeds should also be disinfected. When diseased plants are found, pull them out in time and take them out of the field. Then spread lime powder around the diseased holes and spray thiophanate-methyl comprehensively, which can effectively prevent the disease from continuing to spread.
2. Root rot
It is also a fungal disease. It mainly harms the root system of the plant. When it occurs, dark brown lesions appear on the roots and gradually extend upward along the root system. In a humid environment, the base of the stem gradually softens and rots, accompanied by a foul odor, and the plant gradually withers and dies.
Control method: Choose a plot with good drainage for planting, pay attention to drainage during the rainy season, choose varieties with strong disease resistance for planting, pull out diseased plants in time and take them out of the field, then use lime powder to disinfect the diseased holes. Carbendazim can also be used to drench the roots in the early stage of the disease, with good results.
3. Phytophthora blight
It is also a fungal disease that mainly harms the aboveground parts of the plant. When it occurs, yellow-brown lesions appear on the leaves, and the lesions have obvious brown edges. In the later stage of the disease, black spots appear on the lesions, which can easily cause leaf perforation; affected fruits develop slightly sunken brown spots; affected stems develop sunken yellow-brown diamond-shaped spots.
Control method: Clean the garden comprehensively, burn dead branches and fallen leaves in time, choose disease-free Panax notoginseng seedlings, soak them in Bordeaux mixture for a period of time before transplanting, and when the disease occurs, spray with zineb or thiram. Spray once every week for 2-3 consecutive times.
4. Pests
The main pests of Panax notoginseng include mites, aphids, cutworms and other underground pests. They mainly harm the leaves and rhizome parts, affecting the normal growth of the plant, and in severe cases causing the plant to wither and die.
Control method: Deeply plow the soil during planting to kill overwintering pests. When pests are severe, dimethoate emulsion can be used for control, but pay attention to the concentration to avoid affecting the growth of Panax notoginseng.
The above is an introduction to the common pest and disease control methods for Panax notoginseng. We hope it can help you. If you want to learn more related knowledge, please stay tuned to us.