Integrated control of vegetable root-knot nematode disease

Root-knot nematode disease can endanger vegetables such as cucumber, tomato, eggplant, spinach, sponge gourd, celery, lettuce, cabbage and other crops. It invades the roots only, and suffers heavier damage to lateral roots, often forming many root knots on lateral roots. The connection is like rosary. Root knots are generally spherical or conical, ranging in size, with many fibrous roots on the surface, forming lumps, and open root knots, showing many translucent color needle-point-shaped pear-shaped nematodes. The color of the roots is pale at the beginning, and the surface is smooth and firm. It gradually turns light brown, brown and dark brown rot. The growth in the basement shows atrophy or yellowing, and the plants are easy to wither during drought. The prevention and control of chemical pesticides in production alone is not only costly but also has poor control effectiveness. The integrated prevention and control methods are now described as follows:

First, high-temperature disinfection When the field is busy in summer, use high light to disinfect the soil. That is, after deep plowing and irrigation, the agricultural plastic film is covered on the surface of the soil and then tightly boring for 7-10 days. This can kill 95% of the root-knot nematodes in the soil. According to reports, the soil temperature reached 54°C for 40 minutes, killing nematodes.

Second, crop rotation can generally be carried out with crops such as welsh onion, garlic, leeks, pepper, and grasses to reduce the density of root-knot nematode populations in the soil and effectively control the occurrence and development of diseases.

Third, the choice of bed selection has not occurred root knot nematode disease seedbed, or with sun exposure of the seedbed nursery to prevent the incidence of seedling stage.

Four, deep root-knot nematodes are mostly distributed in the soil layer of about 20 cm, especially in the soil layer of 3-10 cm. Because the pathogenic nematode activity is not strong, the deeper the soil layer, the worse the air permeability, and the less suitable for its survival, so deep turning can effectively kill nematodes.

V. Qingyuan timely removes the diseased roots, diseased plants, diseased bodies, and weeds of the vegetable garden, and burns them in a concentrated manner. Wipe or disinfect the farm implements used in diseased fields to prevent the spread of root-knot nematode disease.

6. In the initial stage of irritation, the liquid can be used to control the spread of insect pests. The 50% phoxim emulsion 1500 times solution or 90% crystal trichlorfon 800 times solution can be used to irrigate the roots. Each strain is 0.25-0.5. Kilograms of liquid, have a good control effect.

7. Gathering fast-growing leafy vegetables, such as lettuce, pakchoi, and spinach, in the severely diseased vegetable gardens. These vegetables are susceptible to root-knot nematodes. After the roots have formed a large number of root knots, the diseased roots are dug as much as possible. Concentrated destruction to reduce the number of root-knot nematodes in soil.

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