This guide is designed to be a reference for detailed information related to the production, pest management, harvest, and storage of the field crops produced in Ontario. Chapter 1 outlines basic crop scouting procedures and the proper initiation of on-farm trials. Chapter 2 discusses various aspects of soil management & fertilizer uses that are common to all field crops in Ontario. The remainder of the guide focusses on each field crop commodity separately, covering such matters as tillage, variety selection, planting, fertility, harvesting, storage, weed control, insect & disease information, and crop problems specific to each commodity. A final chapter focusses on proper grain storage and the control of stored grain insect pests.