. Insect pests of farm, garden and orchard . ort ofU. S. Commissioner of Agriculture, 18S4, p. 317. C. M. Weed, InsectLife, Vol. Ill, p. 289. G. W. Herrick, Journal of Economic Ent., Vol. 219? F. H. Chittenden and C. H. Popenoe, Bulletin 2, Va. Truck , p. 22. 372 IN8ECT PESTS OF FARM, GARDEN AND ORCHARD unci turnips urc injured worst, sciious (huna often being done toturnips in the South. The wingless viviparous female has a rather long oval body,covered with a whitish mealy coat. When this coat has ])eeni-emoved . . the body is seen to be a grayish-green color, witheight l)lack
. Insect pests of farm, garden and orchard . ort ofU. S. Commissioner of Agriculture, 18S4, p. 317. C. M. Weed, InsectLife, Vol. Ill, p. 289. G. W. Herrick, Journal of Economic Ent., Vol. 219? F. H. Chittenden and C. H. Popenoe, Bulletin 2, Va. Truck , p. 22. 372 IN8ECT PESTS OF FARM, GARDEN AND ORCHARD unci turnips urc injured worst, sciious (huna often being done toturnips in the South. The wingless viviparous female has a rather long oval body,covered with a whitish mealy coat. When this coat has ])eeni-emoved . . the body is seen to be a grayish-green color, witheight l)lack spots dow^n either side of the back, increasing in sizetoward the posterior end. The antenme are green with black tipsand are shorter than the body, and the eyes, legs and tail areblack. The young when first hatched are oval, shining, brightyellow in color, and lack the mealy coat. The winged viviparousfemale is yellowish-green, with the eyes, neck and thoracic lobesblack, and the antenna? and nectaries dark V)iown. The legs are. Fig. 269.—The cabbage-aphis {{phis brassier Linn.): a, winged form; 6wingless viviparous female—Greatly enlarged. (After Curtis.) dusky brovv-n and hairy; the tail is dark green or l)rown and alsohairy; the wings are Iather short, with stout coarse A-eins and daikstigma. (Riley). Life History.—Though the cal)l)age-aphis is an oUl ]*]uiopeanspecies and was observed in this country as early as the latter partof the eighteenth century, its life history has only recently Ijcencarefully worked out by Professor G. W. Herrick and Mr. Hun-gate of Cornell University (), from whose account the followingis taken: The oviparous females appear in the fall and are fertilized bythe males, and deposit their eggs in large numbers on the leavesof the cabbage, during Octoljcr and the first days of November,in central New York. The eggs are laid on rape, turnip, brussels INJURIOITS TO CABBAGE AND CRUCIFEROUS CROPS 373 sprouts and kolil-rubi, l)ut are most a
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