. Diseases of economic plants. Plant diseases. TROPICAL FRUITS 193 upon the trunk of the tree, are the first signs of attack. Upon the leaves, the knots are always small, particularly if they are numerous. Upon the small twigs the knots attain the size of a garden pea, while upon the trunk they become 2-3 cm. or more in diam- eter and finally destroy the tree. The disease was noticed in Cali- fornia in 1893 and appears to be confined to a very small range. Peacock leaf spot (Cycloconium oleaginum Cast). — According to Bioletti this disease is very prev- alent in certain regions of Cali- fornia
. Diseases of economic plants. Plant diseases. TROPICAL FRUITS 193 upon the trunk of the tree, are the first signs of attack. Upon the leaves, the knots are always small, particularly if they are numerous. Upon the small twigs the knots attain the size of a garden pea, while upon the trunk they become 2-3 cm. or more in diam- eter and finally destroy the tree. The disease was noticed in Cali- fornia in 1893 and appears to be confined to a very small range. Peacock leaf spot (Cycloconium oleaginum Cast). — According to Bioletti this disease is very prev- alent in certain regions of Cali- fornia, occasionally causing the leaves to turn yellow and injur- ing the appearance of the fruit. Usually it does but little harm. Spots 2-4 mm. in diameter occur upon the leaves. They are com- posed of concentric rings of differ- ent colors, giving them somewhat the appearance of the spots on a peacock's tail feathers. The spots on the fruit are smaller and more decidedly brown in color. The use of Bordeaux mixture checks the trouble. Sooty mold. See citrus Fig. 85. 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- joint author. New York, The Macmillan Company
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Keywords: ., bookauthorstevensf, bookcentury1900, bookdecade1910, bookyear1910
