This manual is designed to assist uses of fumigant pesticides prepared for certification under the Michigan Pesticide Control Act of 1976. An introduction with the explanation of fumigation is presented. The nine sections included describe: (1) Nature and effects of fumigants; (2) Modern fumigants; (3) Precautions to follow when using fumigants; (4) Use of safety devices; (5) Types of fumigation enclosures; (6) Greenhouse fumigation; (7) Fumigation of grain in bulk; (8) Soil fumigation; and (9) Fumigation procedures. A list of self-help questions and instructions for completing the questions are presented at the end of each section. (HM)