This invention relates to agricultural biological control technology, aiming to provide a bamectin-degrading strain, Ldeb-1, and its application in enhancing the resistance of parasitic wasps. This strain is deposited at the China Center for Type Culture Collection (CCTCC), with the deposit name *Stenotrophomoans maltophilia* Ldeb-1 and the Latin taxonomic name *Stenotrophomoans maltophilia*, and the accession number CCTCC NO: M 20252462. The 16S rRNA
gene sequence of the strain is shown in SEQ ID NO: 1. This invention provides a novel strain with outstanding degradation activity against the next-generation macrolide insecticide bamectin, offering a highly targeted and precise tool for addressing bamectin
pesticide residue problems. Introducing a strain derived from a specific parasitic wasp species into its own species can enhance the parasitic wasps'
intrinsic resistance to bamectin, representing a green, safe, and sustainable technology.