. Fig. 47.—Blast of pear on blossoms. Trees already on this root which are persistently bad with black end may be cured by inarching with French pear (Pyrus communis) seedlings and cutting off the connection with the original Japanese root after the inarches are well established. This is not very practical, however, on orchard trees. It is probably better to replace such trees with new ones on P. communis stocks. Those having resistance to fire blight (p. 105) are most desirable. Blast.—This bacterial disease may kill the dormant buds and occa-

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