65 



Corn — Continued. 



Plant-louse, xiii, 9, 11; Misc. Ess., 



117; xvii, XV. 

 ants attending, xiii, 45, 48. See also 



under ants, 

 bred on Panicum glabrum, xiii, 49. 

 calendar of, xiii, 48. 

 Common Ladybug as check on 



multiplication of, xiv, 22. 

 description of, xiii, 46, 53 ; xiv, 25 ; 



Misc. Ess., 47. 

 fertilizers and insecticides as sup- 

 port under attack by, xviii, 76. 

 infesting or injuring Broom-corn 



and Sorghum, xiii, 40, 41, 42, 44; 



xiv, 24, 27. 

 life historv of the, contribution to, 



xiv, 23-33; Misc. Ess., 46-48; xv, 



6; xvii, 67. 

 natural enemies of, xiii, 49; xiv, 



24, 30-33. 

 nomenclature of, xiii, 46; xiv, 25. 

 relation of root and aerial forms 



of, xiv, 24, 29. 

 rotation of crops for, xiii, 50; xiv, 



33; xv, 6; xviii, 75. 

 pollen and sap of, as food of larva 



of corn-feeding Syrphus-fly, xxiii, 



162, 163. 

 eaten by capsid, xxiii, 202. 



by (Ebalus pugnax, xxiii, 194. 



by Phalacrus politus, xxiii, 180. 

 principal insects injurious to, xviii, 



3-4. 

 Root-aphis, xviii, 3, 4, 52, 53, 58-85; 



xxii, 146; xxiii, 2, 4, 5, 6, 12. 

 and Grass Root-louse contrasted, 



xviii, 59-60, 85. 

 breeding - cage experiments with, 



and with eggs of, xxiv, 26. 

 comparative exhibit of results of 



treatment of ground for, xxiv, 29. 

 description of various forms of, 



xviii, 80-82. 

 descriptions of, cited, xvii, 64. 

 discussion of, cited, xxiii, 69, 206. 

 distinguished from Aphis maidis, 



xviii, 82. 

 disease of, xviii, 74. 

 distribution of, xviii, 58. 

 effect of drouth on attack of, xxiv, 

 19. 



on, of change of crop from Corn 

 to Oats, xxiv, 20-24, 28. 



on, of once and twice disking 

 ground for, xxiv, 27, 28, 29. 

 field experiments on the, xxiv, 8-29. 

 Finnegan cultivation experiment for, 



xxiv, 19-20. 

 Galesburg cultivation experiment for, 



xxiv, 9-11. 



Corn Root-aphis — Continued. 



general discussion of results of cul- 

 tivation experiments for, xxiv, 26- 

 29. 



Harvel experiment for, xxiv, 11-13. 



hibernation of, xviii, 62. 



Hinman experiment for, xxiv, 15-19. 



injury by, xvi, XII : xviii, 59-62. 



life history of, xvii, XV, 65-67; 

 xviii, 62-66; xxiv, 8. 

 general statement concerning, 

 xviii, 62. 



methods of investigation concern- 

 ing the, xvii, 64, 65. 



migration of, to uninfested fields, 

 xviii, 65. 



miscellaneous observations in fields 

 infested by, xxiv, 24-26. 



natural enemies of, xviii, 74. 



on Sorghum roots, xviii, 72-73. 



periods and succession of genera- 

 tions of, xviii, 63-65 ; xxiv, 26. 



plowing and harrowing stubble to 

 break up nests of ants attendant 

 on, xviii, 78. 



rank as a corn pest, xviii, 58. 



ratio of winged to wingless speci- 

 mens of, xxiv, 19, 22, 23, 24. 



relation of, to Corn Leaf-aphis, 

 xvii, 64, 67-69; xviii, 57, 69-74. 



relations of, to ants, xvii, 64, 65 ; 

 xviii, 10, 57, 62, 66-68, 82-85. 



scattering eggs and young of, xxiv, 

 8. 



starvation experiments with, xviii, 

 79. 



suggestions for control of, xvii, 69; 

 xviii, 75-80; xxiv, 28. 



summary history of, xvii, 64-70. 



transfer of, to leaf of Corn, xviii, 

 70. 

 to leaf of Sorghum, xviii, 72. 



various generations of, form and 

 food of, xvii, 66, 67. 68. 

 operations in cultivation experi- 

 ments for, xxiv, 9. 



winged form of, xviii, 57, 65, 66, 

 68, 70. 

 root blight, xviii, 52, 59. 

 root-lice, xxiii, 227. 



table for identification of, xviii, 57. 

 Root-worm, xiii, 9, 55 ; xiv, 5 ; Misc. 

 Ess., 19-21, 103; xv, 4; xxiii, 2, 

 5, 12, 16. 



damage by, xiv, 6; xvii, XL 



discussion of, cited, xiii, 55. 



distribution of, Misc. Ess., 20-21. 



infesting Sorghum, xiii, 55 ; Misc. 

 Ess., 19, 21. 



Larger, a bacterial disease of the, 

 xvii, 71-73. 



