Pébrine, or "pepper disease," is a disease of silkworms, which is caused by protozoan microsporidian parasites, mainly Nosema bombycis and, to a lesser extent, Vairimorpha, Pleistophora and Thelohania species.
The parasites infect eggs and are therefore transmitted to the next generation.
The silkworm larvae infected by pébrine are usually covered in brown dots and are unable to spin silkworm thread.
If silkworms acquire this microsporidium in their larval stage, there are no visible signs; however, mother moths will pass the microsporidium onto the eggs, and all of the worms hatching from the infected eggs will die in their larval stage.
Therefore, it is extremely important to rule out all eggs from infected moths by checking the moth's body fluid under a microscope.