. Insect pests of farm, garden and orchard . rn and sorghum are the only othercultivated crops which have been injured, but the list of foodplants includes smartweed, purslane, ragweed, foxtail, and crab- * Aphis maidi-radicis Forbes. Family Aphididce. t S. A. Forbes, 17th, 18th, and 25th Reports of the State Entomologistof Illinois; Bulletin 60, Bureau of Entomology, U. S. Dept. Agr., p. 29;Bulletins 104 and 130, Illinois Agr. Exp. Sta. See also J. J. Davis, Bulletin12, Part VIII, Technical Series, Bureau of Entomology, U. S. Dept. Agr.,and y M. Webster, Circular 86, Bureau of Entomology, U.
. Insect pests of farm, garden and orchard . rn and sorghum are the only othercultivated crops which have been injured, but the list of foodplants includes smartweed, purslane, ragweed, foxtail, and crab- * Aphis maidi-radicis Forbes. Family Aphididce. t S. A. Forbes, 17th, 18th, and 25th Reports of the State Entomologistof Illinois; Bulletin 60, Bureau of Entomology, U. S. Dept. Agr., p. 29;Bulletins 104 and 130, Illinois Agr. Exp. Sta. See also J. J. Davis, Bulletin12, Part VIII, Technical Series, Bureau of Entomology, U. S. Dept. Agr.,and y M. Webster, Circular 86, Bureau of Entomology, U. S. Dept. Agr. INSECTS INJURIOUS TO CORN 165 grasses, and many other weeds and grasses which spring up inthe corn-field. In South Carolina Professor A. F. Conradi hasfound it injuring cotton. If the nests of the small brown ant * so common in corn-fieldsinfested with the root-aphis, l^e broken open during the winter,many of the little black aphis eggs, which have been carefullystored by the ants, will be found. They are a glossy black color,. Fig. 120.—The com root-aphis (Aphis maidi-radicis Forbes): at left, ovip-arous female; a, hind tibia, showing sensoria; at right, male; a, antenna—much enlarged. (After Forbes.) oval in shape, and will sometimes be found in small piles in the chambers of the ants nests. On warm days the ants bring them up to the warmer surface soil and in cold weather carry them far down into the unfrozen earth. With the appearance of young smartweed and foxtail-grass in April and May the eggs commence to hatch. The ants at once lay bare the roots of these plants and carry their young wards to them, where large colonies soon Ijecomc established. If the field is not planted in * Lasiiis niger Linn. var. americanus Emery. See Forbes, Bulletin 131,Illinois Agr. Exp. Sta. 166 INSECT PESTS OF FARM, GARDEN AND ORCHARD corn, the lice will feed later upon the roots of pigeon-grass orpurslane. In early May the second generation of lice commence
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