. Citrus fruit culture. Fruit-culture; Citrus fruits. — 39 NOTES ON DISEASES OF THE ORANGE. Three diseases of the orange tree are widely known in California. First in importance come two kinds of " gummosis," or "gum disease," that which attacks roots and trunks just above the surface of the ground, and, second, that which is called " scaly bark" gum disease. The former has existed in Southern California since 1875. It makes its appearance where the ground has been allowed to remain wet close to the trees for long periods. E. W. Holmes, of Riverside, says that he
. Citrus fruit culture. Fruit-culture; Citrus fruits. — 39 NOTES ON DISEASES OF THE ORANGE. Three diseases of the orange tree are widely known in California. First in importance come two kinds of " gummosis," or "gum disease," that which attacks roots and trunks just above the surface of the ground, and, second, that which is called " scaly bark" gum disease. The former has existed in Southern California since 1875. It makes its appearance where the ground has been allowed to remain wet close to the trees for long periods. E. W. Holmes, of Riverside, says that he has seen fifteen per cent of a seedling orange orchard become affected after heavy appli- cations of nitrogenous manures followed by irrigation close to the trees during hot weather. All the affected parts should be cut out so as to remove every trace of diseased tissue. In some cases this requires repeated cuttings and the use of an antiseptic wash. The " scaly bark" gum disease is the most prevalent form in South- ern California. It attacks the trunk of the tree, and also some 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 Mills, J. W. (James William), 1867-. Berkeley, Cal. : Agricultural Experiment Station
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