Diseases of truck crops Diseases of truck crops / Ralph E. Smith diseasesoftruckc119smit Year: 1940 . Fig. 29.—Pea pods showing Ascochyta spots. the inner pod wall, like the growth of a mold. Downy mildew is some- times very abundant in the spring after cool wet weather, and may also appear in the fall crop in fields subject to heavy coastal fogs. Spraying with bordeaux mixture 4—4-50 (p. 100) before downy mildew develops is said to prevent it, but in most districts it does not appear often enough to warrant doing this every year. No treatment is effective after mildew is seen. Fusarium
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Diseases of truck crops Diseases of truck crops / Ralph E. Smith diseasesoftruckc119smit Year: 1940 . Fig. 29.—Pea pods showing Ascochyta spots. the inner pod wall, like the growth of a mold. Downy mildew is some- times very abundant in the spring after cool wet weather, and may also appear in the fall crop in fields subject to heavy coastal fogs. Spraying with bordeaux mixture 4—4-50 (p. 100) before downy mildew develops is said to prevent it, but in most districts it does not appear often enough to warrant doing this every year. No treatment is effective after mildew is seen. Fusarium Wilt.—Plants affected by wilt become stunted and turn yellow, the leaves curl, and the plants die. The disease causes more or less circular, bare spots in the field, which enlarge year by year if peas are planted in the same land. High soil temperature is favorable to this disease, which is caused by Fusarium orthoceras var. pisi. Varieties are available which are highly resistant to fusarium wilt.