. Diseases of truck crops / Ralph E. Smith. Plant diseases; Plant parasites; Vegetables; Agricultural pests. Fig. 30.—Rust of pea; the same fungus also attacks broad bean. disease, which is caused by Septoria pisi. It is common in winter or spring peas, especially on the lower leaves, but is not often important enough to require control. Spotted Wilt.—The stems of plants affected by spotted wilt are marked with purplish-brown, elongated, dead streaks and brown spots develop on the leaves, which may die prematurely. This is caused by a virus and is identical with the disease of the same name wh
. Diseases of truck crops / Ralph E. Smith. Plant diseases; Plant parasites; Vegetables; Agricultural pests. Fig. 30.—Rust of pea; the same fungus also attacks broad bean. disease, which is caused by Septoria pisi. It is common in winter or spring peas, especially on the lower leaves, but is not often important enough to require control. Spotted Wilt.—The stems of plants affected by spotted wilt are marked with purplish-brown, elongated, dead streaks and brown spots develop on the leaves, which may die prematurely. This is caused by a virus and is identical with the disease of the same name which affects tomatoes, lettuce, and many other plants. So far as is known at present, spotted wilt is not of major importance on peas in California. For fur- ther information, see page 97. Stem Rot.—The plants sometimes die from a rotting of the stems and. 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 Smith, Ralph E. (Ralph Eliot), 1874-1953. Berkeley, Calif. : College of Agriculture, Univ. of Calif.
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