Breeding method for bombyx mori anti-pyohematopathy variety

The invention discloses a breeding method of a silkworm polyhedrosis-resistant variety. A disease-resistant gene is introduced into a target variety, poison is added to each generation to select and retain the disease-resistant gene, the disease-resistant gene is backcrossed with the target variety for four generations to basically retain economic characters of the target variety, and homozygous detection and fixation of the disease-resistant gene are carried out in a mode of one male to two female. Firstly, male parent anti-disease gene homozygous detection is carried out in a mode that one male parent is crossed with two female parents; female parent disease-resistant gene homozygosis detection is carried out on the basis of male parent disease-resistant gene homozygosis, the method is also carried out in a one-male-two-female paired mating mode, female parent and male parent disease-resistant gene homozygosis detection is carried out at the same time, namely female and male simultaneous detection is carrie