. Culture of the citrus in California. California. Pomology; Citrus. 256 STATE BOARD OF HORTICULTURE. The following species of this genus infest citrus trees in California: (1) Red scale—Aspidiotus aurantii, Maskell. (2) Yellow scale—Aspidiotus citrinus, Coquillett. (3) Oleander scale—Aspidiotus nerii, Comstock. (1) Red Scale. A circular, flat scale, known by the popular name of " red scale," from the color of its shell. Scale of female is light gray, quite translucent. Female light yellow in adolescent stages; as it reaches maturity becomes brownish. Veatral view of ius
. Culture of the citrus in California. California. Pomology; Citrus. 256 STATE BOARD OF HORTICULTURE. The following species of this genus infest citrus trees in California: (1) Red scale—Aspidiotus aurantii, Maskell. (2) Yellow scale—Aspidiotus citrinus, Coquillett. (3) Oleander scale—Aspidiotus nerii, Comstock. (1) Red Scale. A circular, flat scale, known by the popular name of " red scale," from the color of its shell. Scale of female is light gray, quite translucent. Female light yellow in adolescent stages; as it reaches maturity becomes brownish. Veatral view of iusect. Red scale on leaf. Scale of male resembles female, except that it is only one fourth as large. Male light yellow, thoracic band brown; eyes purplish black. This insect is the worst enemy to citrus culture in California. It attacks the trunk, branches, leaves, and fruit. So far no effective parasites are known to attack it, excepting predaceous insects, which do not increase rapidly enough to check its progress. Treatment.—Rosin solution (formula No. 1), and gas treat- ment (formula No. 4). (2) Yellow Scale. A small yellow scale, infesting citrus trees in the San Gabriel Valley, Los Angeles, Sacramento, Oroville, and 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 original Lelong, Byron Martin, 1856-1901. Sacramento, A. J. Johnston, superintendent state printing
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