. Cooperative economic insect report. Beneficial insects; Insect pests. - 610 Life History, Habits and Descriptioa: An eyeless animal with a complex metamor- phosis, the garden symphylan may live for several years and may have in excess of 50 molts. It inhabits only moist places and is almost entirely subterranean throughout its life. It is unable to force its way through the soil because of its delicate structure and must confine its movements through natural cracks and crevices. EGG - About mm. in diameter, pearly white and covered with a net- work of tiny ridges. Eggs are laid in runway
. Cooperative economic insect report. Beneficial insects; Insect pests. - 610 Life History, Habits and Descriptioa: An eyeless animal with a complex metamor- phosis, the garden symphylan may live for several years and may have in excess of 50 molts. It inhabits only moist places and is almost entirely subterranean throughout its life. It is unable to force its way through the soil because of its delicate structure and must confine its movements through natural cracks and crevices. EGG - About mm. in diameter, pearly white and covered with a net- work of tiny ridges. Eggs are laid in runways in soil in clusters of 5 to 15 or more. Various investigators state the incubation period to be 7 to 21 days, IMMATURE - Newly hatched instars have 6 pairs of legs and 6 obvious antennal segments. They acquire one additional pair of legs for each of the next 6 molts, or until the seventh instar, when the full complement of 12 pairs are developed. During this period, 18 to 21 additional antennal segments are formed, making a total of 24 to 27 on the seventh instar. ADULT - Very delicate, light cream color and so transparent that food in the alimentary tract shows through. The adult continues to molt and add additional antennal segments which may be regen- erated if broken off. Adults range in length, according to various investigators, from 2 to mm., with 5-8 mm. a more common measurement. Sexual maturity occurs some time after the seventh molt. (Prepared in Survey and Detection Operations in cooperation with other ARS agencies). CEIR 12(23):6-l-62. 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 United States. Animal and Plant Health Service. Plant Protection and Quarantine Programs; United States. Bureau of Entomology and Plant Quarantine; United States. Plant Pest Control Division. Hyattsville, MD. [
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