Diseases of fruits and nuts Diseases of fruits and nuts diseasesoffruits120smit Year: 1941 Diseases of Fruits and Nuts 115 sunken, dark-colored spot on the side in summer. The tissue beneath is dead and dry and sticks to the pit. This trouble is apparently caused by high temperature and seems similar to shrivels, or drought spot (p. 117), which occurs also on other fruits. Fig. -Gumming on shoots of French prune produced by shot-hole borer. Little-Leaf.—On affected trees, the leaves are pale and narrow and the growth weak. The symptoms are more fully described on page 141. True littl
Diseases of fruits and nuts Diseases of fruits and nuts diseasesoffruits120smit Year: 1941 Diseases of Fruits and Nuts 115 sunken, dark-colored spot on the side in summer. The tissue beneath is dead and dry and sticks to the pit. This trouble is apparently caused by high temperature and seems similar to shrivels, or drought spot (p. 117), which occurs also on other fruits. Fig. -Gumming on shoots of French prune produced by shot-hole borer. Little-Leaf.—On affected trees, the leaves are pale and narrow and the growth weak. The symptoms are more fully described on page 141. True little-leaf, which affects many kinds of trees, is nonparasitic and may be cured by the application of zinc. The method of spraying with zinc sulfate in the dormant seasons, as recommended for apples (p. 21), gives satisfactory control. Good results have also been obtained by driv- ing small pieces of galvanized iron into the bark. Oak-Root-Fungus Disease, Armillaria Root Rot.—Trees infected with oak root fungus, Armillaria niellea, become weak and sickly and
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