. 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.—Tree
. 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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