Revised edition. There are two classes of sweet potato diseases, 1) field troubles (which are either root and stem diseases or leaf diseases), and 2) storage rots. Root and stem diseases include stem-rot, black-rot, foot-rot, scurf, and root-rot; and leaf disease, leaf-blight, white-rust, and leaf-spot. There are many methods of control for field diseases which are discussed. Control of the five storage rots described hinges on careful storage-house management.

Revised edition. Report discussing diseases which affect onions in both the field and in storage, and methods for their control. Diseases discussed include smut, downy mildew, leaf mold, fusarium rot, pink root, root knot, neck rot, bacterial soft rot, black mold, smudge, rust, white rot, dodder, damping-off, purple blotch, yellow dwarf, aster yellows, eelworm rot, diplodia rot, blue mold rot, and aspergillus rot.