. California plant diseases. Plant diseases. Bulletin 218] CALIFORNIA PLANT DISEASES. 1145 seems to disappear or be removed in some manner, leaving the rind in a normal condition. When decolorized and treated with iodine, the rind of oranges freshly picked in a brown spot season and locality shows the presence of an accumulation of starch in areas here and there, corre- sponding to about the size and distribution of the brown spots which would have developed on the same oranges if they had been kept for a week or two. If tested in the same way after the spots have developed, an accumulation of
. California plant diseases. Plant diseases. Bulletin 218] CALIFORNIA PLANT DISEASES. 1145 seems to disappear or be removed in some manner, leaving the rind in a normal condition. When decolorized and treated with iodine, the rind of oranges freshly picked in a brown spot season and locality shows the presence of an accumulation of starch in areas here and there, corre- sponding to about the size and distribution of the brown spots which would have developed on the same oranges if they had been kept for a week or two. If tested in the same way after the spots have developed, an accumulation of starch is similarly found in the areas forming the spots. It therefore appears that diastatic action in these areas is in- hibited in some way. Investigation has thus far failed to demonstrate the nature of the. Fig. 70.—Puffing of orange fruit. initial injury, whether due to some climatic condition, lack of moisture, or possibly an insect puncture. It is certainly not due to frost or cold weather. The fruit from certain groves seems to show the trouble more than that from others, and it is possible that the same is true of individ- ual trees, but this has not yet been determined. See Bulletin 203, page 47, California Experiment Station. Splitting. The fruit cracks and splits on the tree before maturity. Varies from year to year in abundance. Apparently caused by climatic or seasonal conditions causing irregularity in the growth of the 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 Smith, Ralph E. (Ralph Eliot), 1874-1953; Smith, Elizabeth H. (Elizabeth Hight), 1877-1933. Berkeley, Cal. : Agricultural Experiment Station
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