Great progress has been made in the past decade in the field of sericulture research. Sericulture technique covering various aspects has also advanced greatly. Like agriculture, in sericulture, as an industry, we look forward to greater development in research and technology aimed at increased production. The text covers the entire gamut of subjects with the latest data relating to mulberry and silkworm. Particular emphasis has been laid on the basic aspects of stable crop of silkworm and various preventive measures against adverse factors. The book is designed specially for use by university students, researchers and technologists engaged in sericulture. Research and development in the field of sericulture is at a very advance level in Japan than in any other country. The same is true of sericulture technology. However, sericulture research in Japan includes quite a few topics which have no bearing on their direct application. At the same time, to develop a new ideal technology, a comprehensive knowledge of the fundamental aspects is necessary. The point has been emphasised throughout the book. Researchers in sericulture will find this book a very useful guide and will be motivated to find solutions to existing problems.