Symptoms of disease in plants; Non-parasitic diseases; Diseases due to deficiences of food materials in the soil; Diseases due to excesses of soluble salts in the soil; Diseases due to unfavorable water relations; Diseases due to improper air relations; Diseases due to high temperatures; Diseases due to low temperatures; Diseases due to unfavorable light light relations; Diseases due to manufacturing or industrial processes; Diseases due to control practices; Virus and related diseases; Parasitic diseases; Bacterial diseases of plants; Diseases due to slime molds; The conditions of a fungus in or on the substratum; Diseases due to downy mildews and allies; Diseases due to pondscum parasites; Diseases due to black molds and allies; Diseases due to leaf curls and related fungi; Diseases due to cup fungi and allies; Diseases due to powdery mildews and allies; Diseases due to sphere fungi and allies; Diseases due to imperfect fungi; Diseases due to smut fungi; Diseases due to rust fungi; Diseases due to palisade fungi and allies; Parasitic seed plants and the troubles they cause; Nematodes and the diseases they cause.

Seedling diseases and injuries. Leaf diseases and injuries. Body and branch disease and injuries. Root diseases and injuries. Alder diseases. Arbor-vite diseases. Ash diseases. Bald cypress diseases. Basswood diseases. Beech diseases. Birch diseases. Buckeye diseases. Butternut diseases. Catalpa. Cedar diseases. Chestnut diseases. Elm diseases. Fir diseases. Hackberry diseases. Hemlock diseases. Huckory diseases. Juniper diseases. Larch diseases. Locust diseases. Maple diseases. Oar diseases. Pine diseases. Polar diseases. Spruce diseases. Sycamore or plane tree diseases. Walnut diseses. Willow diseases. Tree surgery. Spraying and dusting for leaf diseases.