What are the characteristics of cucumber root-knot nematodes?

In recent years, with the development of cucumber planting mode in greenhouse to base and continuous cropping by farmers, good growth conditions have been created for soil nematodes in greenhouse. Therefore, cucumber root-knot nematode disease is becoming more and more serious, and it is spreading. Cucumber root-knot nematodes will cause poor plant development and poor fruit setting, which will directly affect the yield and economic benefits of cucumber. Cucumber root-knot nematodes mainly harm cucumber roots. After injury, tumor-like nodules, large and small, can be formed, which are milky white at first and turn light brown in the later stage. When the root node is cut, there are very small milky white nematodes inside. The symptoms of their aboveground parts are short plants and stunted growth. When there is drought and water shortage, they may wither around noon. Generally, a thin new root can be born on the nodule, and then infection will form a rhizomatous tumor. Prevention and control method: flooding method. In conditional areas, the soil layer on the surface 10 cm or deeper can be deposited for several months, which can prevent the infection, reproduction and growth of root-knot nematodes. Deep turn. Root-knot nematodes are mostly distributed in 3 ~ 9 cm topsoil, which can reduce the harm after deep tillage. Implement crop rotation. Selecting disease-free soil to raise seedlings. Celery, cucumber and tomato are highly susceptible vegetables, while green onions, leeks and peppers are disease-resistant vegetables. Planting disease-resistant vegetables in diseased areas can reduce losses.