. Cirtus fruits under irragation. Citrus fruits; Fruit-culture. 46 § 22 CITRUS FRUITS UNDER IRRIGATION 47 CO 50. Fumigating Trees.—A detail of management that is not generally employed in fruit growing, except for citrus fruits in the West, is the fumigation of the trees with hydrocyanic gas for controlling scale insects. Where these pests are trouble- some in California and Arizona, the trees should be fumigated at least every other year, and occasionally oftener. The details of fumigation are described in a subsequent Section. 51. Combating Rodents.—In the citrus regions of the West squirrel
. Cirtus fruits under irragation. Citrus fruits; Fruit-culture. 46 § 22 CITRUS FRUITS UNDER IRRIGATION 47 CO 50. Fumigating Trees.—A detail of management that is not generally employed in fruit growing, except for citrus fruits in the West, is the fumigation of the trees with hydrocyanic gas for controlling scale insects. Where these pests are trouble- some in California and Arizona, the trees should be fumigated at least every other year, and occasionally oftener. The details of fumigation are described in a subsequent Section. 51. Combating Rodents.—In the citrus regions of the West squirrels and gophers are sometimes pests that must be combated. Especially are they troublesome in newly planted regions. The details of combating rodents is also given in a subsequent Section. BUDDING OVER TREES 52. Mature citrus trees can be budded over from one citrus variety to any other citrus variety. For example, a certain variety of orange can be budded over to another variety of orange, or the orange can be budded to the lemon; the lemon to the grapefruit; the orange to the lime, citron, etc. In Fig. 35 is shown 40-year-old seedling orange trees budded over to Valencias, and in Fig. 36 is shown a mature Valencia tree budded over to lemons. A grower near San Dimis, California, has budded a tree to twenty-two varieties of citrus fruits, including different varieties of oranges, lemons, pomelos, limes,' citrons, etc. Such a tree, although it has little commercial value, shows how any citrus variety can be budded on any citrus stock. The fact that citrus trees can be so readily budded over is often of much commercial advantage to a grower. For example, if he has a number of old seedling trees he can bud them over to Bahias, Valencias, or lemons, which are more profitable to grow. The buds can be inserted into the bark of old branches or into the bark of twigs. The former method is most commonly practiced, as it is the quicker way to secure a new tree. When working on old woo
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