Ill 



oppositus, Leptoglossus, xxiii, 197, 198. 

 Orache infested by Aphis atriplicis, xxi, 



82. 

 Orange as food plant of Grass-worm, 

 xxiii, 82. 

 of Zebra-caterpillar, xxi, 153. 

 infested by Melon Aphis, xxi, 81. 

 by Sulphur Leaf-roller, xiv, 20; 

 xxiii, 174. 

 Osage. See Osage Orange. 

 Oranges injured by Leptoglossus phyl- 



lopus, xxiii, 197. 

 Orchard fumigation at Richview, 111., 

 xxii, 38-43. 

 details of same, and results of, 

 xxii, 39-42. 

 at Sparta, 111., xxii, 34-38. 



details of same, and results of, 

 xxii, 35-38. 

 cost of, xxii, 43^44. 

 description of equipment for, xxii, 

 31-32. 

 of operation of, xxii, 32-33, and 

 cuts illustrating, xxii, 58-66. 

 experience with, xxii, 31-43. 

 preliminary operation in, xxii, 33- 



34. 

 test of method of, xxii, 30. 

 -grass, xvii, 62. 



as food plant of Garden We!b- 

 worm, xxiii, 90. 

 trees, destruction of infested, xxi, 17, 

 18. 19, 20, 21, 22, 23, 24; xxii, 38. 

 39, 48. See also under Apple, Peach, 

 Plum, etc. 

 Orchards injured by Canker-worm, xxii, 

 144. 

 Strioed Cricket abundant in, xxiii, 



215. 

 tree-crickets in. xxiii, 217. 

 Orchelimum. xxiii, 215, 216. 

 agile, xxiii. 144. 



general description of, x-:i, 131. 

 glaberrimum, xxiii, 144, 146. 

 oblono-ifolia, food of, xxiii, 144-145. 

 silvaticum, xxiii, 144, 146. 

 vulgare. Misc. Ess.. 118; xxi, 135; 

 ^xx-'ii, 13. 144. 146. 

 injury to C^rn by, xiv. 23. 

 Oregon and California washes, use of, 

 in Illinois, xxii, 68-90. 

 wash for San Jose Scale, xxii, 67, 

 82-87. 

 details of experiments with, 



xxii, 82-87. 

 tables showing effect of, 

 xxii, 83, 84. 

 preparation of. xxii, 72. 

 used on Apple and on Peach, xxii, 

 82-87. 



Orgyia leucostigma infesting Willow, 



xiv, 117. 

 Ormenis pruinosa, xxiii, 203. 



general description, oviposition, food 

 plants, and life history of, xxi, 83, 

 84, 85. 

 Ormerod, E. A., xiii, 16. 

 ornata, Liburnia, xxi, 65, 67. 

 ornigis, Apanteles, xv, 57. 

 ornithogalli eudiopta, Prodenia, xxiii. 

 80. 

 Prodenia, xxiii* 79. 

 Ornix, Apple, xv, 51-57. 



geminatella, xv, 51-57. See Apple 



Ornix. 

 prunivorella, xv, 52, 53, 55. 

 Ortalidse, xxiv, 162. 

 Orthoperus scutellaris found on Corn 



and on apple-trees, xxiii, 180. 

 Orthoptera as strawberry insects, xiii, 

 60, 61, 62. 

 destructive to Corn, xxiii, 13. 

 of the corn field, leaf-eating, xxiii, 

 226, 229. 

 oryzae, Calandra, Misc. Ess., 111. 

 Osage Orange as food plant of the 

 Green and Mealv Flatas, 

 xxi, 84. 

 of May-beetles, xxiv, 143. 

 of Red-banded Leaf-roller, 

 xxiii, 175. 

 flamed with gasoline blast-lamp, 



xxiv, 52. 

 hedge infested by San Jose Scale, 

 destruction of, xxi, 

 17. 23, 24; xxii, 39, 

 40. 

 treatment of, with kero- 

 sene emulsion, xxii, 

 40. 

 infested by San Tose Scale, xx, 1. 

 9, 11; xxi, 4. 13, 17, 23, 24; 

 xxii, 35, 38. 39, 40. 41, 42. 

 by Soft Maple Bark-louse, xiv, 

 104. 

 Osborn, Herbert: xiii. 12. 72, 76, 116; 

 xv, 72: xvi. 33, 37, 38; xvii. 4, 65; 

 xviii, 86. 135; xxi. 68. 69, 70. 71, 

 72. 74. 75, 76. 85, 86, 96, 132, 138; 

 xxiii, 100, 118. 

 and Gossard, H. A., xxiv, 6. 

 Oscinidse, xxiii, 164. 



European wheat, parasite of, xiii, 24. 

 rotation of crops for, xiii, 27, 29. 

 Osmia canadensis, xiii, 61. 

 Otiorhynchidse as strawberry insects, 



xiii. 60. 

 Otiorhynchus ovatus, xxiii, 192-193, 228. 

 picipes, xxi, 144. 

 singularis, xxi, 143, 144. 

 sulcatns. xiii, 62, 177; xxi. 143, 144. 



