Fecha de publicación: 15/07/2022 Fuente: Wipo Tobacco Agriculture The invention provides a bio-organic fertilizer with a root knot nematode disease prevention and treatment function and a preparation method and application thereof, the bio-organic fertilizer comprises a strain WSWFJ44, 3-5 parts by weight of polyglutamic acid, 8-10 parts by weight of mineral source fulvic acid, 50-70 parts by weight of marigold flower residue, 15-20 parts by weight of rapeseed meal and 0.1-0.5 part by weight of a decomposing inoculant. The organic fertilizer can kill insect bodies and eggs of root-knot nematodes, promotes the regrowth of crop roots, can play a good role when applied to crops with large-area diseases, and has a certain promotion effect on the development of organic agriculture; the biological organic fertilizer is used for solving the current agricultural production problem that root-knot nematodes are many and difficult to prevent, and the biological organic fertilizer provided by the invention can promote the growth of crop root systems, can promote crops to grow root systems again after diseases break out, and can reduce the loss of the crop yield and quality caused by the diseases. The biological prevention and control organic fertilizer is efficient, innovative and environment-friendly.