. Cypress bark scale. Cypress; Scale insects. 14 BULLETIN" 838, U. S. DEPARTMENT OF AGRICULTURE. Larvae isolated in rials, immediately after hatching, lived for two and three days. Living for this length of time and traveling at the* above rate of speed during only the warmer parts of the day, larvae could go considerable distances in search of proper food. In this way larva? are able to migrate from one tree to another in closely planted hedges or windbreaks. During this migratory period, larvae are also likely to be transported short distances by dropping from high. Fig. 2.—Tracings of
. Cypress bark scale. Cypress; Scale insects. 14 BULLETIN" 838, U. S. DEPARTMENT OF AGRICULTURE. Larvae isolated in rials, immediately after hatching, lived for two and three days. Living for this length of time and traveling at the* above rate of speed during only the warmer parts of the day, larvae could go considerable distances in search of proper food. In this way larva? are able to migrate from one tree to another in closely planted hedges or windbreaks. During this migratory period, larvae are also likely to be transported short distances by dropping from high. Fig. 2.—Tracings of five first-instar larvae of the cypress bark scale during migration. Reduced 5i times. All were started from the same center. branches and being carried by the wind, and for longer distances by animate agencies, such as insects, birds, and animals. ATTACHMENT. As soon as a larva finds a suitable crevice or a protected area in the bark, it thrusts its proboscis into the bark tissues, where it remains permanently. Larvae have not been known to remove themselves from this first location to another after once becoming attached. Larvae which have become detached somewhat later in life are able to crawl about feebly, but finally die without being able to attach. 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 Herbert, F. B. (Frank Barnes), 1890-. Washington, D. C. : U. S. Dept. of Agriculture
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectcypress, bookyear1920
