Journal of Agricultural Research . ^*»; Washington, D. C. PLATE 4 A.—Recurrence of rootrot infection at the margin of an old area meters indiameter, June 18, 1922. B.—The same circle July 6, 1922, 10 meters in diameter. PLATE 5 A.—Rootrot spot, approximately 7 meters in diameter, in an alfalfa field, Sep-tember 18, 1921. B.—The same spot at the beginning of disease activity, June 18, 1922, now approxi-mately 9 meters in diameter. The stakes designate the outer rim of the circularband of dying plants. C.—The same spot July 6, 1922, after the hay had been cut. D.—The same spot August 26, 192
Journal of Agricultural Research . ^*»; Washington, D. C. PLATE 4 A.—Recurrence of rootrot infection at the margin of an old area meters indiameter, June 18, 1922. B.—The same circle July 6, 1922, 10 meters in diameter. PLATE 5 A.—Rootrot spot, approximately 7 meters in diameter, in an alfalfa field, Sep-tember 18, 1921. B.—The same spot at the beginning of disease activity, June 18, 1922, now approxi-mately 9 meters in diameter. The stakes designate the outer rim of the circularband of dying plants. C.—The same spot July 6, 1922, after the hay had been cut. D.—The same spot August 26, 1922, approximately 13 meters in diameter. In theinterior of the spot appears the growth of grass, weeds, and reestablished alfalfa colored fruiting bodies of the fungus can be seen at the right, near the periphery. Habits of tlie Cotton Rootrot Fungus Plate 5 , . a. , a ^y- \\ ^*^\:
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