These surveys were carried out to investigate of damage of agricultural chemicals, tabacco, and factory smoke on silkworm rearing Autumn in 1975 1. Damaging rate in chemicals, tabacco and factory smoke was 1.4, 0.6 and 0.1 percent each other. 2. In damage by agricultural chemicals, it appeared to be chemicals for rice (49.4%) orchard (21.2%) and vegetable (12.3%) in order. 3. Status of damaging rate in tabacco showed 60 and 18 percent in tabacco field and tobacco drying place near mulberry field. and showed 14 and 8 percent in rabacco drying place and tabacco field near rearing house. 4. The damage of factory smoke is largely stone powder of cement.