Insect pests of farm, garden and orchard . on the plant-lousepunctures. The wingless form of this aphisis about 2 mm. (one-twelfth inch)long and half as wide at the widestpart, the body being somewhat ovatein outline. The general color is palegreen, with the cauda, cornicles andthe greater part of the rostrum,antennae and legs black. The headis marked wuth two longitudinal dark bands, and the abdomen with a row of black spotson each side and a black patch about the base of the latter are swollen in the middle, making the outlines . The winged form is somewhat different i
Insect pests of farm, garden and orchard . on the plant-lousepunctures. The wingless form of this aphisis about 2 mm. (one-twelfth inch)long and half as wide at the widestpart, the body being somewhat ovatein outline. The general color is palegreen, with the cauda, cornicles andthe greater part of the rostrum,antennae and legs black. The headis marked wuth two longitudinal dark bands, and the abdomen with a row of black spotson each side and a black patch about the base of the latter are swollen in the middle, making the outlines . The winged form is somewhat different in color, the headbeing black and the thorax chiefly black above. The abdomenis pale green, bluish at the sides, with two transverse black bandspreceding the cauda, and the segments behind it edged with differences between this and the root aphis are shown inthe accompanying figures. Aphis maidis has been reportedat various times as a corn insect from New York to Texas,Minnesota and California. The species makes its appearance. Fig. 125.—The winglessfemale of the corn leaf-aphis — much enlarged.(After Webster, ) 172 INSECT PESTS OF FARM, GARDEN AND ORCHARD in midsumjiier, our earliest date (Illinois) being July 9, whenspecimens were found on young leaves of corn. We have norecord whatever to show whence it comes or where it lives pre-ceding this time. Having once commenced to breed on the foodplants mentioned, it continues there until freezing weather over-takes it, when, with the death of its food plants, it graduallydisappears, leaving neither eggs nor hibernating adults on orabout these plants, and passing the winter we do not know howor where. Its occurrence on barley in Texas in January maythrow some light upon its wintering habits in the South. Thelatest to develop in the field largely acquire wings, and as the sapsupply in the plant diminishes they fly away. Wingless females,on the other hand, perish on the spot. Indications are thusvery stron
Size: 1537px × 1626px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpublisheretcet, bookyear1912
