150 THE SPRING GRAIN-APHIS OR U GREEN BUG. ' ' 



Page. 



Grain-aphis, spring, outbreak of 1903 24-26 



1907 27-38 



parasites, primary or true 104-125 



secondary 125-128 



predaceous enemies 128-136 



preventive and remedial measures 136-143 



pupae, measurements of antennal joints 61 



rearing methods 51-57 



remedial and preventive measures 136-143 



remedies, artificial introduction of parasites .*. . 142-143 



cultural methods 139-142 



field experiments 136-139 



treatment of affected spots 140, 141 



reproduction, age when begun by females 70-71 



reproductive period 71-72 



sexual forms 76-78 



descriptions 77-78 



situation in 1911 40 



stem mothers 58 



summer forms, first instar, description 59 



fourth instar, description 59 



second instar, description 59 



third instar, description 59 



viviparous development 44-78 



in the North 49-50 



South 44-49 



female, fecundity 73-75 



winged male, description 78 



viviparous female, measurements of antennal 



joints 61 



wingless female, description 60, 61 



versus winged females, fecundity 75-76 



young produced daily, average number 76 



Grazing, close, against spring grain-aphis 142 



"Green bug. " (See Grain-aphis, spring.) 

 Gum, black. (See Nyssa sylvatica.) 



Harrowing infested spots against spring grain-aphis 137 



Hippodamia convergens, enemy of spring grain-aphis 129 



Holcus halpensis, food plant of spring grain-aphis in America 43 



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



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



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



Europe 41.43 



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



pus-ilium, food plant of spring grain-aphis in America 41, 42, 43 



vulgar e. (See Barley.) 



Hosaekia glabra, food plant of Myzus sp 117, 125 



Hyalopterus dactylidis, Allotria sp. a secondary parasite 128 



Megorismus sp. a secondary parasite 126 



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



Kerosene emulsion against spring grain-aphis 138 



Kochia scoparia, food plant of aphidid 116 



sp., food plant of aphidid 125 



