. -J)ieback of Frcncli piuno trees, associated with overbearing and deficiency of potassium in soil. Applications of copper, either to the soil, through holes in the trunk, or by spraying with 5-5-50 bordeaux mixture as recommended for pears (p. 101) are effective in curing this disease in prune trees. Gum Drops, Shot-Hole Borer.—Small globules of clear, white gum break out from the twigs and branches all over the tree (fig. 62). These glisten in the sun like raindrops. The cause of this is a small beetle, the shot-hole borer, Scolytus riigidosus, which breeds in the bark. Sickly

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