Causes and control methods of yellowing of garlic

It is believed that people who have experienced growing garlic have encountered the phenomenon of garlic yellowing, especially in recent years, due to the influence of various factors in production, the phenomenon of garlic yellowing is particularly prominent, resulting in a decrease in garlic yield. the quality of garlic is also seriously reduced. At present, it is the garlic planting period, what causes garlic yellowing, and how to avoid garlic yellowing has become the focus of many farmers.

Garlic is yellow, which is mainly caused by improper management of fertilizer and water, soil acidification and so on. But in fact, the yellow garlic is more likely to be caused by diseases and insect pests, especially the root-knot nematode disease which is particularly serious in recent years. Root-knot nematode disease is caused by nematodes infecting crops, and there are many kinds of crops harmed by root-knot nematodes. If trees, melons, eggplant fruits, legumes and other crops are affected by nematodes, garlic is no exception.

According to experts, with the adjustment and upgrading of China's agricultural structure in recent years, and affected by factors such as traditional planting patterns and limited arable land, the multiple cropping index of crops is generally on the high side. The host plants of nematodes such as vegetables and melons planted in some plots for a long time, and root-knot nematode disease is serious, leaving more insect sources in the soil, while garlic is mostly intercropped with these host plants. This led to the occurrence of garlic root-knot nematode disease, especially in greenhouses, greenhouses and protected areas. According to the observation, when the second instar larvae of garlic root-knot nematode harm garlic, it will pierce the tender part of the fibrous root (root tip) through a sharp needle, and the root knot will hinder the absorption of nutrition and water by the root system, and the growth of the root system is hindered and the phenomenon of not growing new roots often occurs. However, the symptoms of aboveground diseased plants were not obvious at the initial stage, but with the development of the disease, the growth was weak, the leaves were yellowish green, and the leaves were scattered, which was similar to the symptoms of lack of water and fertilizer. With the development of the disease, the diseased plants gradually yellowed, wilted, and even withered and died.

Thus it can be seen that the prevention of garlic yellowing is inseparable from the prevention and control of garlic root-knot nematode. Experts say that the prevention and control of root-knot nematodes should be focused on prevention rather than treatment. Preventive measures can take agricultural and physical control methods, while the control of root-knot nematodes needs to be combined with chemical agents to achieve the best control effect. In the choice of agents, farmers can choose Yinghui line killer. It is understood that Yinghui line killer beneficial to root sand, Yinghui Express Line, Tiandi Line and other products aimed at different growth stages of garlic, launched two dosage forms of granule and water agent, which can be used in different growth periods of garlic, and the control effect is quite outstanding. Farmers can use Yinghui nematicide granule ditch application, hole application or whole field application before garlic transplanting, and the duration is as long as 2-3 months. If garlic is damaged by root nematodes in the growing period, Yinghui nematicide water can be used to irrigate the roots and irrigate them with water.

Compared with the influence of uncontrollable factors such as drought and flood disasters and extreme weather, the prevention and control of controllable disasters such as diseases and insect pests is more important for farmers and can be prevented by man-made means. we will also continue to pay attention to and update the relevant content to provide more help to farmers.