. Citrus fruits; an account of the citrus fruit industry, with special reference to California requirements and practices and similar conditions . below. The two types of wood above discussed are not alwaysclearly differentiated, and intermediate forms are oftenmet with. Such forms are often puzzling to the amateurpruner, whose best policy is to allow them to remain tem-porarily and watch future tendencies. In every casewhere the growth is clearly a sucker, and experiencedpruners find little difficulty in distinguishing them, theyshould be vigorously suppressed. It is very important to keep a
. Citrus fruits; an account of the citrus fruit industry, with special reference to California requirements and practices and similar conditions . below. The two types of wood above discussed are not alwaysclearly differentiated, and intermediate forms are oftenmet with. Such forms are often puzzling to the amateurpruner, whose best policy is to allow them to remain tem-porarily and watch future tendencies. In every casewhere the growth is clearly a sucker, and experiencedpruners find little difficulty in distinguishing them, theyshould be vigorously suppressed. It is very important to keep a careful watch for bud- Pruning and Top-Working 211 sports, especially in old Navel trees wliich have beenpropagated from carelessly selected buds. The same sportwill sometimes appear many times on different trees in thesame orchard, as explained in Chapter VII. Some growersconfuse sporting branches with the dimorphic branchesdiscussed above, while in reality the phenomena are quitedistinct. Sporting involves a change in the germ-plasmof the cells, while the dimorphic differences mentioneddo not. Sports may be removed while the branches are. Fig. 65. — One of the best types of pruning shears. still small and the orchard thus kept true to type by prun-ing. Occasionally a tree may be encountered which ap-parently has ever-sporting tendencies. This is due tothe fact that the mutation occurred in the trunk early inthe history of the tree, or even on the tree from whichthe original bud was taken, and the mutative cells havemultiplied and become distributed through various partsof the tree. It requires very drastic pruning to cure sucha tree of its bad habits, and it is often advisable to pull itout and plant a new tree in its place. It is well for the pruner to bear in mind, however, that Citrus Fruiti wliilr the great majority of sports are objectionable, someof our improved varieties have originated as sports, and itis therefore wise to critically examine the fruit of everysport
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