. Class book of economic entomology, with special reference to the economic insects of the northern United States and Canada. Beneficial insects; Insect pests; Insects; Insects. CLASSIFICATION AND DESCRIPTION OF COMMON INSECTS 363 States, is closely associated with the corn-root louse or aphid (Aphis maidiradicis Forbes). Forbes has shown very interestingly how the ants carry the eggs of this aphis into the underground galleries of their nests on the approach of winter, tend them carefully, and in the spring carry the young aphids to suitable weeds, transferring them later to the corn plants.
. Class book of economic entomology, with special reference to the economic insects of the northern United States and Canada. Beneficial insects; Insect pests; Insects; Insects. CLASSIFICATION AND DESCRIPTION OF COMMON INSECTS 363 States, is closely associated with the corn-root louse or aphid (Aphis maidiradicis Forbes). Forbes has shown very interestingly how the ants carry the eggs of this aphis into the underground galleries of their nests on the approach of winter, tend them carefully, and in the spring carry the young aphids to suitable weeds, transferring them later to the corn plants. In the control of this aphid, therefore, the best method is to plow and harrow in the autumn infested fields so as to break up the ants' nests, to destroy the weeds that may serve as temporary food-plants, and to practise crop rotation. NEAR RELATIVES OF INSECTS INJURIOUS TO PLANTS AND ANIMALS Crustaceans, Arachnidans and Myriapods belong also to the great Branch of Animals called the Arthropoda, hence are here termed "near relatives" of insects. Class Crustacea Sow Bugs, Pill Bugs or Wood Lice.—Sow bugs cause considerable injury both indoors and outdoors to young growing flower and vege- table crops. They occur in dark moist conditions, near dwellings such as cellars, outhouses; about walls, cisterns, water barrels; under boards, stones and rubbish; in green- houses and rockeries. They usually feed at night. They are sometimes injurious in mushroom beds and to the roots of strawberries. The eggs are laid in early summer. The in- cubation period varies with the different species— in Armadillium vulgare Latr. about 70 days. The young are carried in a pouch formed of modified plates on the abdomen of the female. Other species are Porcellio Icevis Latr., A. quadrifrons, and Oniscus asellus Linn. They have seven pairs of legs, and antennse which are 7-jointed (Fig. 240). Control.—Cleanliness about outhouses, potting houses, etc.; the use of baits of sliced potatoes
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectinsects, bookyear1919
