. Class book of economic entomology. Insects, Injurious and beneficial. [from old catalog]; Insects; Insects. CLASSIFICATION AND DESCRIPTION OF COMMON INSECTS 127 The chief Chalcid parasites are FrospaUella perniciosa Tower, Aphelinus fuscipennis How., and A. diaspidis Kow., but the percentage of parasitism is too low for effective Fig. 79.—Pygidia of Aspidiotus. Showing the characteristic differences in five common species. Greatly enlarged. D, dorsal surface; V, ventral surface. (After Sanders.) Control.—Plant fumigated nursery stock; spray with lime-sulphur wash (sp. gr. ) bef
. Class book of economic entomology. Insects, Injurious and beneficial. [from old catalog]; Insects; Insects. CLASSIFICATION AND DESCRIPTION OF COMMON INSECTS 127 The chief Chalcid parasites are FrospaUella perniciosa Tower, Aphelinus fuscipennis How., and A. diaspidis Kow., but the percentage of parasitism is too low for effective Fig. 79.—Pygidia of Aspidiotus. Showing the characteristic differences in five common species. Greatly enlarged. D, dorsal surface; V, ventral surface. (After Sanders.) Control.—Plant fumigated nursery stock; spray with lime-sulphur wash (sp. gr. ) before the buds burst; spray with certain miscible oils (see Part IV). The three closely related species, Putnam Scale {A. ancylus Putn.) wintering in nearly full-grown condition and oviparous, the eggs. 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 Lochhead, William, 1864- [from old catalog]. Philadelphia, P. Blakiston's son & co
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectinsects, bookyear1919
