. Diseases of economic plants . Plant diseases. DISEASES OF ECONOMIC PLANTS fungi have been isolated from these spots/ some of them may sustain a causal relation to the disease. Whatever the actual causal fungus may be, these spots are all, or nearly all, of fungous ori- gin and are amenable to preventive spraying with Bordeaux mixture. The first of three or four appUcations should be given with the opening of the leaf buds. Illosporiose, leaf spot (Illosporium malijolio- rum Shel.). — This is said by Sheldon- to be the cause of much of the defoliation of apple or- chards in West Virginia and
. Diseases of economic plants . Plant diseases. DISEASES OF ECONOMIC PLANTS fungi have been isolated from these spots/ some of them may sustain a causal relation to the disease. Whatever the actual causal fungus may be, these spots are all, or nearly all, of fungous ori- gin and are amenable to preventive spraying with Bordeaux mixture. The first of three or four appUcations should be given with the opening of the leaf buds. Illosporiose, leaf spot (Illosporium malijolio- rum Shel.). — This is said by Sheldon- to be the cause of much of the defoliation of apple or- chards in West Virginia and adjacent states. The spots are circular, 5-15 mm. in diameter, brown or mottled and gray, con- centrically marked. For treatment see page 100. ' Notably by Hartly, Minnesota, and by Lewis, I. M., New Hampshire Agr. Exp. Sta. Rpt. 1&-20, November, 1908. " Sheldon, J. L., Torreya, S, 141, June, Fig. 33.—.\pple leaf spot in late stage of development, showing concentric rings. 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
