. Agricultural entomology for students, farmers, fruit-growers and gardeners. Insects; Insects, Injurious and beneficial. 132 ORDER HEMIPTERA An interesting subdivision of the group includes the Orthcziince which secrete a white calcareous secretion which appears in plates or filaments extending from the body, often as long parallel bars extending back some distance from the body. A rather common species in the Northern States is solidaginis, occurring on goldenrod. There also is included in this group the very destructive cottony cushion scale, Icerya purchasi, which for a time threatened the
. Agricultural entomology for students, farmers, fruit-growers and gardeners. Insects; Insects, Injurious and beneficial. 132 ORDER HEMIPTERA An interesting subdivision of the group includes the Orthcziince which secrete a white calcareous secretion which appears in plates or filaments extending from the body, often as long parallel bars extending back some distance from the body. A rather common species in the Northern States is solidaginis, occurring on goldenrod. There also is included in this group the very destructive cottony cushion scale, Icerya purchasi, which for a time threatened the fruit. Fig. 87.—Pulvinaria innumerabilis: adult females in position on twigs with egg sacs—natural size. (Howard, Div. Ent., U. S. Dept. Ag.) industry of California but which was brought under control by the importation of the Australian lady bird (Vedalia cardmalis). The subfamily Coccincp includes what are termed the soft scales. The bodies of these are covered more or less com- pletely with a waxy secretion which adheres firmly to the body wall and furnishes a thick^ more or less rigid protec- tion to the body. Most of them adhere fixedly to the bark or leaves but in some cases a migration at the time of moult-. 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 Osborn, Herbert, 1856-1954. Philadelphia, New York, Lea & Febiger
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectinsects, bookyear1916
