. 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. 140 ECONOMIC ENTOHOLOOY wingless form, and =P~ the viviparous agamic winged form, an! c? and 9 the sexual forms (Kig. 95). In general, plant-lice arc sofl-lxuliiMl and green, sometimes brow or black. The winged forms have four delicate wings with a few simpli veins—the front [air much larger than the hind pair. The sucking beak is .vj"inled; t
. 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. 140 ECONOMIC ENTOHOLOOY wingless form, and =P~ the viviparous agamic winged form, an! c? and 9 the sexual forms (Kig. 95). In general, plant-lice arc sofl-lxuliiMl and green, sometimes brow or black. The winged forms have four delicate wings with a few simpli veins—the front [air much larger than the hind pair. The sucking beak is .vj"inled; the legs and antenna' are long and the eyes [)rom; nent. In autumn the sexual females deposit eggs that ha",!, 'n lib spring into females which are often termed "; I hi^ produce living; females which in turn produce living females, and s for several generations. .\s each female produces several young, ;iii I these mature in a short time, reproducliim - very rapid. When autumn approaches an! food supply becomes scarce a brood of win;;i I males aid wingless females is produtc I The females produce the winter eggs. Sonn limes agamic females hibernate. There are many species of plant-llic. some feeding on one variety of plant, ' 11 many are capable of feeding on two or min varieties. Some feed for a time on one hn-i plant, then migrate to another for the sum mer, finally returning to the first one in autumn. Some produce abnormal growth' called galls, such as the grape phylloxt ra gall, the cockscomb gall <m the elm, in Cottonwood gall, the poplar gall, etc. Most plant-lice excrete a sweet liquid called "honey-dew," whnh is attractive to ants, bees, wasps and other insects. On account ni this honey-dew aphids are often attended by ants who guard th< 111. Forbes has shown that the little brown ant (Lasius niger) has domi-:!- cated the Corn Root Aphis, which is cared for xnA controlled in ill stages of its development. (Consult Bull, no, 1
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectentomology, bookyear1
