Application of bifid virus-containing phytophthora nicotianae strain in prevention and treatment of black shank

The invention belongs to the technical field of prevention and treatment of tobacco diseases, and particularly relates to application of a phytophthora nicotianae strain containing a bifid virus in prevention and treatment of black shank. The preservation number of the Phytophthora nicotiana strain XC-26-5 is CCTCC (China Center for Type Culture Collection) NO: M 2024037, and the preservation number of the Phytophthora nicotiana strain XC-26-5 is CCTCC NO: M 2024037. The bacterial strain XC-26-5 contains a double-split virus PpnPV1 (Phytophthora paraasitala var nicotiana parativirus 1), and the bacterial strain XC-26-5 has the advantages that the bacterial strain XC-26-5 contains the double-split virus PpnPV1; the trial results of the fungicide show that the prevention and control rate of the black shank can reach about 70% under the condition of 300g/mu, the application effect and popularization and application prospects are obvious, and meanwhile, good reference is provided for the development of other prev