This reference manual for training Peace Corps agricultural development workers deals with crops. The document begins with common units of area, length, weight, volume, and conversions between them. A practice problem is worked and other conversion problems are given. The second section is intended to show agricultural field workers how to survey and interpret the important features of a local agricultural environment and the individual farm units that are part of the environment. Section 3 is a guide to troubleshooting common crop problems. Section 4 offers guidelines for vegetable growing. Section 5 is an introduction to insects and insect control. Section 6 discusses nonchemical pest controls. Using chemical insecticides is the subject of section 7. Section 8 covers disease control. Section 9 discusses nematodes. Section 10 deals with weed control. An annotated bibliography suggests four vegetable-related references to be ordered for each trainee and references on vegetables and field crops to be placed in a training center library. Included among those library references are 7 on vegetables, 20 on insects, diseases, weeds, and nematodes; 3 on soil management and fertilizer use; 2 on irrigation; 13 on field crop production; 3 on root and tuber crops; 1 on tropical agriculture; and 2 on agriculture extension. (CML)