. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. 10 FUMIGATION INVESTIGATIONS IN CALIFOENIA. EXTENT OF CITRUS ; The production of citrus fiiiits in southern CaHfornia is confined to the narrow stretch of land south and west of the Sierra Madre Range, extending from Santa Barbara on the nortli to the Mexican border. Altliough citrus plantings are located here and there through- out this territory, in reality only a small proportion of the land capable of cultivation is devoted to this industiy. The most promi- nent centers of production (see fig.
. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. 10 FUMIGATION INVESTIGATIONS IN CALIFOENIA. EXTENT OF CITRUS ; The production of citrus fiiiits in southern CaHfornia is confined to the narrow stretch of land south and west of the Sierra Madre Range, extending from Santa Barbara on the nortli to the Mexican border. Altliough citrus plantings are located here and there through- out this territory, in reality only a small proportion of the land capable of cultivation is devoted to this industiy. The most promi- nent centers of production (see fig. 1) are in the foothills region and lower land of the San Gabriel Valley; the corresponding regions of the San Bernardino Valley, including the Redlands-Highland, the Riverside, and the Corona districts; and the coast region of Orange ANGELES. SAN BERNARDINO ORIVtHSIDE °/)f>LINGTOH RIVERSIDE o£sco/i/e/oc SAN OIEGO 0l/lfC£S/0£ MN D/E60 OCHULA VISTA Fig. 1.—Map showing principal localities in southern California where citras fruits are produced. (Original.) and Los Angeles counties. Regions of smaller production are found in southern Santa Barbara and Ventura counties, in the San Fer- nando Valley, and in western San Diego County. CITRUS PESTS. INSECT ENEMIES OF CITRUS FRUITS, AND THEIR DISTRIBUTION. The larger number of the pests most injurious to citrus fruits in southern California belong to the Coccidse, a group of insects popu- larly known as scale-insects. Among the scale-insects which are a For a general description of the California citrus-fruit industry, see Bulletin 123, Bureau of Plant Industry, United States Department of Agriculture, which may be obtained for 20 cents from the Superintendent of Documents, Government Printing Office, Washington, D. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the origin
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