The yellow leaves of the cultivated oranges, fall off, even twigs dead, poor fruit growth ... These phenomena at first glance believe that you also think this is Huanglong disease. This is not the case. This phenomenon is more likely to be caused by citrus root knot nematode disease. According to statistics, citrus root knot nematode disease occurs in Guangdong, Fujian, Zhejiang and other provinces. Let's take a look at what the disease is. Symptoms of citrus root knot nematodes mainly damage the roots, especially fine roots, branch roots and fibrous roots. Neonatal root nodules, milky white, after the change from yellow brown to dark brown, root nodules grow on the fine roots, serious secondary diseases produce root nodules and a large number of small roots, causing root knots, the formation of fibrous root cluster; old nodules and more rotting, root necrosis. After the roots are damaged, the canopy shows weak branches, small leaves, low rate of results, small fruit, lack of leaves, growth and decline, etc., severe root damage, yellow leaves, curled leaves or flowers, and lack of luster. , Like lack of water, resulting in dry leaves after the fall or branches withered and even the death of the whole plant. In this regard, how to prevent citrus root knot nematode disease? Control methods can be divided into two kinds of medications and non-medications. Non-medication methods mainly include the following: In addition, experts said: The discovery of citrus cultivation of root knot nematode disease, farmers are usually recommended to use the agent to prevent and control. If the citrus fruit is about to be harvested, and the symptoms on the ground of the citrus are slight, it can be treated with Ligeng Sand Granules after the harvest. If you are growing citrus and have a long period of time away from the harvest, you can use Propolis emulsifiable concentrate for prevention and treatment. The medicine can quickly and effectively infiltrate into the root tissue of citrus to kill the invading nematode and help the citrus to recover.
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1. Breeding disease-resistant rootstocks. According to local cultivation conditions, rootstocks resistant to citrus root knot nematode disease were cultivated and screened by testing various suitable rootstocks.
2, strengthen fertilizer and water management. The use of organic fertilizer for diseased trees, 15-25 kilograms per plant, and organic fertilizer and indigenous soil fertilization in accordance with a ratio of 1:1, in the winter when digging cut off the roots is appropriate, preferably in the cold. At the same time, when the soil is expanded in June, the organic fertilizer is deepened once again. The irrigation is performed according to the conventional cultivation management regulations, and other fertilizer and water management measures are strengthened to increase the tree vigor so as to reduce the damage degree of the disease.
3, strict implementation of quarantine. The purchase of seedlings should be strengthened by quarantine, and seedlings that are likely to be infected with nematodes should be purchased in wards that have been affected by root-knot nematode disease. The protection of non-disease areas should be strengthened to prevent the spread of soil, fertilizer, water, and farming tools in the wards to the area without disease.
4, strict implementation of quarantine. The purchase of seedlings should be strengthened by quarantine, and seedlings that are likely to be infected with nematodes should be purchased in wards that have been affected by root-knot nematode disease. The protection of non-disease areas should be strengthened to prevent the spread of soil, fertilizer, water, and farming tools in the wards to the area without disease.
When using medicine, it is recommended to use Ligen Sand for prevention and treatment. Ligen Sand launched two formulations of granules and emulsifiable concentrates at different stages during the growth period of citrus: 3-4 months, 7-8 months in combination with 4-6 kilograms of mixed-grown or finely ground granules for fertilization, with the main trunk as the center. The roots of the citrus canopy within the roots of the drip line are 10-20 cm deep and then spread evenly on the surface of the soil to cover the soil with water. In severe cases, the roots of the root oil are 800-1500 diluted with water from May to June. 
The complementary advantages of Ligan sand particles and emulsifiable concentrate can provide full root protection for the whole growing season of citrus and solve the “fundamental problem†that affects crop growth.
