Development of Research Methods for Mulberry Silkworm Disease- Nuclear Polyhedrose

Nuclear polyhedrosis, that is jaundice, is distinguished among other mulberry silkworm diseases by its pathogenicity. It is a powerful viral, hereditary disease of mulberry silkworm that results in mass destruction of mulberry silkworm. Polyhedrose is spread in all silk manufacturer countries and incurs the losses to sericulture more than any infectious diseases of mulberry silkworm. Viruses which insite this disease are characterized by hexagonal form crystalline formations, that is polyhedrons, detected in the hemolymph (blood) of diseased warms by microscope, but in the grain phase polyhedrons can’t be fixed even by a microscope. The period from the moment of infection till its exposure (6-8 days) is a hidden, latent period; length of this period depends on worm premise temperature, humidity and feed quality [1].