. Diseases of economic plants. Plant diseases. 204 DISEASES OF ECONOMIC PLANTS Round Pod Wax, Refugee Wax, Burpee's White Wax, GrenelPs Rust-proof Golden Wax, Wardwell's Kidney Wax, Dwarf German Black Wax, Early Stem rot, pod rot (Rhizodonia sp.). — This disease is manifest in three forms:2 — 1. Damping off of seedlings. See damping off. 2. Dry rot of the stem. In this condition the tissue is dead, discolored, and dry-rotted at from 2-5 cm. above the. Fig. 92. — Bacterial disease upon bean seeds. After Clinton. ground. The rot extends to the pith and usually encircles the stem, and
. Diseases of economic plants. Plant diseases. 204 DISEASES OF ECONOMIC PLANTS Round Pod Wax, Refugee Wax, Burpee's White Wax, GrenelPs Rust-proof Golden Wax, Wardwell's Kidney Wax, Dwarf German Black Wax, Early Stem rot, pod rot (Rhizodonia sp.). — This disease is manifest in three forms:2 — 1. Damping off of seedlings. See damping off. 2. Dry rot of the stem. In this condition the tissue is dead, discolored, and dry-rotted at from 2-5 cm. above the. Fig. 92. — Bacterial disease upon bean seeds. After Clinton. ground. The rot extends to the pith and usually encircles the stem, and thus so weakens the plants that they are often broken by the wind. In any event they soon wilt and die. 3. As brown sunken areas upon pods, penetrating to and discoloring the seeds. The germination of the seed is not stopped by this attack, and a fruitful source of dissemi- nation is thus afforded. Such seeds should be Downy mildew (Phytophthora Phaseoli Thaxt.). —The downy mildew is a northern disease regarded by Halsted4 1 Duggar, B. M., and Stewart, F. C, (Cornell) Agr. Exp. Sta. Bui. 186, January, 1901. 2 Fulton, H. R,., La. Agr. Exp. Sta. Bui. 101, January, 1908. 3 Hedgcock, G. G., Sci. n. s. 19, 268, February, 1904. 4 Halsted, B. D., Agr. Exp. Sta. Bui. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Stevens, Frank Lincoln, 1871-1934; Hall, John Galentine, 1870- joint author. New York, The Macmillan Company
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