148 THE SPEING GRAIN-APHIS OE " GBEEN BUG.'' 



Page. 



Chxtochloa italica, food plant of spring grain-aphis in America 42, 43 



viridis, food plant of spring grain-aphis in America 42, 43 



Chaitophorus sp., host of Aphidius testaceipes 116 



Megorismus sp. a secondary parasite 126 



Pachyneuron sp. a secondary parasite 128 



viminalis, host of Aphelinus semiflavus 123, 125 



Cheat. (See Bromus secalinus.) 



Chenopodium album, food plant of aphidid 116 



Chess, soft. (See Bromus hordeaceus.) 



Chrysopa plorabunda, enemy of spring grain-aphis 132-133 



Coccinella abdominalis, enemy of spring grain-aphis 129 



9-notata, enemy of spring grain-aphis 129 



Colopha eragrostidis, host of Aphelinus mali 123, 125 



Corn, food plant of spring grain-aphis in America 41, 43 



Europe 41, 43 



Couch grass. (See Agropyron repens.) 

 Cricket, snowy tree. (See (Ecanthus niveus.) 



Crop rotation against spring grain-aphis 141 



Cultural methods against spring grain-aphis 139-142 



Currant, food plant of Myzus ribis 125 



Cynodon dactylon. (See Capriola dactylon.) 



Dactylis glomerata, food plant of spring grain-aphis in America 41, 42, 43 



Europe 41, 43 



Distichlls spicata, food plant of spring grain-aphis in America 42, 43 



Drag. (See Brush drag.) 



Echinochloa crus-galli, food plant of spring grain-aphis in America 42, 43 



Eleusine indica, food plant of spring grain-aphis in America 42, 43 



Elymus canadensis, food plant of spring grain-aphis in America 41, 42, 43 



striatus, food plant of spring grain-aphis in America 42, 43 



virginicus, food plant of spring grain-aphis in America 42, 43 



Erayrostis mcgastachya, food plant of spring grain-aphis in America 42, 43 



pilosa, food plant of spring grain-aphis in America 42, 43 



sp., Aphidius tcstaceijies swept therefrom 117 



food plant of aphidid 117, 125 



Enpeodes volucris, enemy of Aphis avcnse 130 



spring grain-aphis 130 



Fagopyrum esculenlum, food plant of spring grain-aphis in Europe 41, 43 



Fescue, hard. (See Fesluca duriuscula.) 

 meadow. (See Festuca elatior.) 

 sheep's. (See Festuca ovina.) 

 vario us-leaved. (See Festuca heterophylla.) 



Festuca duriuscula, food plant of spring grain-aphis 42, 43 



elatior, food plant of spring grain-aphis in America 42, 43 



heterophylla, food plant of spring grain-aphis in America ' 43 



ovina, food plant of spring grain-aphis in America 42, 43 



rubra, food plant of spring grain-aphis in America 43 



Fungous disease of spring grain-aphis 136 



Grass, Bermuda. (See Capriola dactylon.) 

 blue. (See Poa pratcmis.) 

 couch. (See Agrojnjron repens.) 

 Italian rye. (See Lolium mullijlorum.) 

 Johnson. (See Sorghum halepense.) 

 rye. (See Elymus canadensis.) 



