Diseases of truck crops Diseases of truck crops / Ralph E. Smith diseasesoftruckc119smit Year: 1940 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 af

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Diseases of truck crops Diseases of truck crops / Ralph E. Smith diseasesoftruckc119smit Year: 1940 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

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