Distribution and Symptoms: Mainly distributed in warm tea producing areas. The disease is caused by a very small nematode. When the nematode invades tea roots, it causes the roots to form tumors, resembling soybeans, rapeseeds, etc., and are of different sizes. The roots of the affected species need not be rooted, deformed, and sometimes the root end is thicker than the front end. The above-ground part of the diseased plant had poor growth, the plants were short, the growth was weak, and the leaves were yellow. In dry season, the leaves were easily detached and died.
Occurrence pattern: Root-knot nematodes are aerobic organisms that are hi-dry and dry. They occur in multiple generations in one year. When the soil temperature reaches 25-30°C and the soil moisture is about 50%, they are found in sandy soils with high topography and loose soil structure. The first generation can be completed within 20 to 30 days, while the nematode occurs more in the top soil than in the bottom soil, and stops when it is below 10°C.
Control methods:
1 Choose raw land as a nursery, if it is planted with peanuts, melons, beans, sweet potatoes and other crops, it should not be used as a nursery. In the summer, the soil should be deeply turned and exposed to sunlight for 10 days before turning it over once to kill the soil. In the nematode.
2 The existing diseased seedlings should be supplemented with phosphate fertilizer and potash fertilizer; the disease resistance should be improved, and disinfection with lime or applying 1:20 tea dry water to the soil also has better control effect.
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