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Item Incidence of Bacterial and Viral Diseases of Silkworm, Bombyx Mori L. in Bangladesh and their Control(University of Rajshahi, 1989) Barman, Anil Chandra; Rahman, Mustafizur; Quayum, M. A.Like other forms of life, the silkworm, Bombyx mori L. is also affected by various types of diseases. During the growth the silkworms come in contact with a number of pathogenic agents like virus, bacteria, fungus, protozoans etc. under natural environmental conditions. Life functions are thus interfered and a disease occurs. The ultimate result is the loss of worms and hence loss of cocoon production. The earliest scientific report on insect diseases was on silkworm ailments (Kirby 1826). Afterwards it was experimentally demonstrated that the microorganisms are the causative agents for certain sickness in silkworms (Steinhaus 1963). A major breakthrough in our understanding of silkworm disease was achieved by Pasteur (1885) who identified that the protozoan, Nosema sp. was responsible for the devastating disease ' pebrine' of silkworm (Rene Dubas 1960). Bacterial and viral diseases of silkworm are the most common diseases inhabiting all the silk producing countries and areas, although their severity varies with the consequent interaction of existing environment of different regions. Total crop losses due to these diseases are rarely known, but the cocoon yield is largely hampered affecting national plan as well as personal income. In any of the cases of bacterial or viral diseases, starting point is the individual silkworm from which the disease is spread to the population. The occurrence of disease in a population is the consequence of interaction between pathogen, host and the environment……………………….Item Incidence of Bacterial and Viral diseases of silkworm. Bombyx mort l. In Bangladesh and their control(University of Rajshahi, 1989) Barman, Anil Chandra; Rahman, MustafizurLike other forms of life, the silkworm, Bombyx rnori L. is also affected by various ts of diseases. During the growth the silkworms come in contact with a number of pathcqenic agents like virus, bacteria, fungus, protozoans etc. under natural environmental conditions. Life functions are thus interfered and a disease occurs. The ultimate result is the forms and hence loss of cocoon production-. The earliest scientific report on insect diseases was on silkworm ailments ( Kirby 1826). Afterwards it was experimentally demonstrated that the micro- .__ organisms are the causative agents for certain sickness in silkworms (Steinhaus 1963). A major breackthrough in our undestanding of silkworm disease was achieved by Pasteur (1885) who identified that the protozoan, Nosema sp. was responsible for the devastating disease ' pebrine' of silkworm (Rene Dubas 1960). Bacterial and viral diseases of silkworm are the most comnon diseases inhabiting all the silk prooucing countries and areas, although their severity varies with the ccnsequent interaction of existing env- ronment of different regions. Total crop losses due to these diseases are rarely known, but the cocoon yield is l;:irgely hampered affecting national plan as well as personal income. In any of the cases of bacterial or viral diseases, starting point is the individual silkworm from which the disease is spread to the pop..ilation. The occur1ence of disease in a p-,pulation is the con r---. since of interaction between pathcqen, host and the environment. -----------