. Diseases of economic plants . Plant diseases. VEGETABLE AND FIELD CEOPS 287 Blotches' appear upon the leaves, first as small, moist, watery areas, associated with slight local wilting, followed soon by the appearance upon either side of tlie leaf of very small brown acervuli. The spots then change to gray and dry up. The disease spreads rapidly from plant to plant and is very destructive both under glass and in the open, rendering the plant unfit for use. White smut (Entyloma El- lisii Halst.). — The attacked plants are unmarketable, due to lack of uniform green ('olor and the presence of jK
. Diseases of economic plants . Plant diseases. VEGETABLE AND FIELD CEOPS 287 Blotches' appear upon the leaves, first as small, moist, watery areas, associated with slight local wilting, followed soon by the appearance upon either side of tlie leaf of very small brown acervuli. The spots then change to gray and dry up. The disease spreads rapidly from plant to plant and is very destructive both under glass and in the open, rendering the plant unfit for use. White smut (Entyloma El- lisii Halst.). — The attacked plants are unmarketable, due to lack of uniform green ('olor and the presence of jKile bleached spots upon the foli- age. These spots are not definitely limited, nor does their tissue die as it does in the case of other spinach leaf spots. Black mold {Cladosporium macrocarpum Preuss.). — The black mold develops especially upon old leaves, and renders the plant unsalable, fhe spots are distinguishable from all other spinach spot dis- eases by their irregularity, indefinitcness, and color. General. — To control all the above .spinach diseases, it is well to burn refuse, practice rotation, and ' Halstcd, B. D., Agi. Kxp. St:i. Bill. 70, July, IS' Fig. ;i,—. leaf spotted by hetcrosporiosc. After 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-. New York : Macmillan
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Keywords: ., bookauthorstevensf, bookcentury1900, bookdecade1910, bookyear1910
