. Class book of economic entomology [microform] : with special reference to the economic insects of the northern United States and Canada. Insect pests; Entomologie; Entomology; Insectes nuisibles, Lutte contre les; Insect pests; Insectes nuisibles. 128 ECONOMIC ENTOMOLOGY I- i hatching in June-July, the Forbes Scale (.1. forbesi John.), and the Curtis Scale (.A. oslreajormis Curtis) (Fig. 79), are difficult to dis tinguish from the San Jose Scale, and are also found in orchards A comparison of the pygidium, or the fused posterior abdominal seg- ments, under the microrcope enables one to ident
. Class book of economic entomology [microform] : with special reference to the economic insects of the northern United States and Canada. Insect pests; Entomologie; Entomology; Insectes nuisibles, Lutte contre les; Insect pests; Insectes nuisibles. 128 ECONOMIC ENTOMOLOGY I- i hatching in June-July, the Forbes Scale (.1. forbesi John.), and the Curtis Scale (.A. oslreajormis Curtis) (Fig. 79), are difficult to dis tinguish from the San Jose Scale, and are also found in orchards A comparison of the pygidium, or the fused posterior abdominal seg- ments, under the microrcope enables one to identify the adults of the-c species. On the dorsal surface of the pygidium are the anal openin^' and the glands that secrete the wax of the scale. On the ventral sui face are the vaginal opening and 4 or 5 groups of spinnerets (wantini; in the San Jose Scale). The margin of the pygidium is modified ini". A B c Fio. 80.—Three common orchard scales. A, San Jos^ scale; B, oyster-shell si ale C, scurfy scale. lobes with thickenings, dorsal and ventral spines, and plates character- istic of each species (Fig. 79). Euonymus Scale {Chionaspis-euonymi Comst.) is a common pesi hi Euonymus in the Eastern United States. Two broods a season. Female scale elongate-oval, brown, with yellow exuvia, convex; male scale white, parallel-sided, 3-ridged, with yellow exuvia, much smuller than female scale. Rose Scale {Aulacaspis rosee Bouche).—.\ttacks rost', raspberry, blackberry, etc. Female scale snow-white, nearly circular, thin and flat, K2 i''^*' in diameter; with two Ught yellow exuviae at margin; oviparous. Male scale shorter, narrower, 3-ridged. Hibernates in all stages, hince all stages may be found on one infested plant. Two or three brou l^a. 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, 186
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectentomology, bookyear1
