Application method for applying vanilline under soil conditions to prevent and treat meloidogyne incognita chitwood

The invention belongs to the field of agriculture and provides an application method for applying vanilline under soil conditions to prevent and treat meloidogyne incognita chitwood. The application method is used for applying the vanilline to soil. Particularly, at the seedling age of tomatoes with three leaves and one heart to tomatoes with five leaves and one heart, seedlings are transplanted, one seedling is planted in each pot, and the vanilline is applied to the soil after seedling transplantation, wherein an application mode is a direct application mode or a drop irrigation mode and by dry weight of the soil, the application amount of the vanilline is 0.2 to 8.0mmol/kg dry soil. According to the invention, the prevention and treatment effects of the vanilline on meloidogyne are observed and an experiment of applying the vanilline to the soil by adopting a direct application method and simulating a drop irrigation method so as to prevent and treat the meloidogyne incognita chitwood is performed. When the vanilline with concentration of 0.2 to 4.0mmol/kg dry soil is directly applied to the soil under the soil conditions, not only are normal growth and development of tomatoes ensured, but also infection and reproduction of the meloidogyne are inhibited, wherein the tomato root-knot number inhibition ratio reaches 26.5 percent to 57.2 percent and the egg mass inhibition ratio reaches 29.5 percent to 46.2 percent.