Methods of controlling root-knot nematode disease of Panax quinquefolium

In recent years, more and more farmers choose to plant American ginseng to improve their income. American ginseng is a common traditional Chinese medicine with large market demand and high planting efficiency. At the same time, because of the long planting cycle of American ginseng, American ginseng is often vulnerable to root-knot nematode disease, resulting in serious yield reduction.

It is understood that American ginseng root-knot nematode disease is a disease caused by root-knot nematode infection. The root-knot nematode only harms the ginseng root, and the root knot is formed due to the stimulation of the esophageal secretion of the root-knot nematode. The root knot is milky white and solid at first, but gradually becomes dark brown and often decays in the later stage. Due to the damage to the roots, the normal function of the roots was affected, the ability to absorb fertilizer and water decreased, the diseased plants on the ground were weak, the leaves yellowed and lost green, flowered late and returned to the seedlings early, and even withered and died in serious cases.

In addition, root-knot nematode will cause mechanical damage to the root during infection, and the wound provides a way for other pathogens in the soil to invade, resulting in root-knot nematode disease and root rot, rust rot and other diseases co-infection, aggravating the disease. According to statistics, after being harmed by root-knot nematode disease of Panax quinquefolium, the yield of diseased fields can generally be reduced by 20%, 30%, and more than 70% in severe cases.

Root-knot nematode disease is a kind of soil-borne disease, which can be transmitted by diseased seedlings, diseased soil, water flow, daily agricultural work and other ways. Once the soil is infected, it is difficult to completely eliminate. At the same time, because American ginseng is a perennial perennial herb, it can only be harvested if it grows in the soil for 3 years or more. Therefore, in the cultivation and production of American ginseng, controlling the root-knot nematode base in the soil and even ensuring the health and cleanliness of the soil is the basis of the normal growth and development of American ginseng. Experts said that in the early stage of prevention and control of root-knot nematode disease of Panax quinquefolium, farmers can use conventional agricultural and physical control methods, such as disease-free soil disease-free seedling cultivation, rotation pest control, deep ploughing soil, and so on.

In addition, experts also remind farmers that spring is coming, which is an active period for root-knot nematodes to resume activities and invade new roots. At this stage, farmers can combine nematodes to control root-knot nematodes in soil when fertilizing and promoting new roots next spring, so as to lay a foundation for root restoration and root extraction of Panax quinquefolium.

Among the line killers used in the past, most of the products have serious environmental pollution and are unsafe to people and animals, and now most of them have been banned. Therefore, experts recommend that farmers can choose Yinghui line killer, Yinghui line, Yinghui fast line, Tiandi line, wireless and other products have launched two dosage forms of granule and water agent, which are suitable for different growth stages of American ginseng. These pesticides are biological pesticides with remarkable control effect and no pollution. Farmers can use Yinghui nematicide granule ditch application, hole application or whole field application before American ginseng transplanting or the current spring fertilizer, and the duration is as long as 2-3 months. If American ginseng suffers seriously during the growing period, Yinghui line killer can be used to irrigate the root with water and flush it to have a good control effect.