Abstract: The present invention relates to the technical field of agricultural pest control, and more particularly, to the application of pyrrole-2-carboxaldehyde in controlling plant root-knot nematodes. Pyrrole-2-carboxaldehyde and agronomically acceptable salts thereof have strong insecticidal activity against root-knot nematodes. Pyrrole-2-carbaldehyde shows the advantages of high efficiency, low toxicity and low residue compared to other insecticides and is more compatible with the environment, which meets the needs of green plant protection and sustainable agricultural production and development.