Flacherie is a disease of silkworms, caused by silkworms eating infected or contaminated mulberry leaves. Flacherie infected silkworms look weak and can die from this disease. Silkworm larvae that are about to die from Flacherie or a dark brown. In 1865, Louis Pasteur was the first one able to recognize that this disease and pébrine are caused by the protozoan Nosema bombycis. Binomial name Bombyx mori Linnaeus, 1758 The silkworm (Bombyx mori, Latin: silkworm of the mulberry tree) is the larva of a moth that is very important economically as the producer of silk. ... Protozoa (in Greek protos = first and zoon = animal) are single-celled creatures with nuclei that show some characteristics usually associated with animals, most notably mobility and heterotrophy. ...