150 THE SPRING GRAIN-APHIS OE 
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 caespitosum, 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 
pusillum, food plant of spring grain-aphis in America 41, 42, 43 
vulgar e. (See Barley.) 
Hosackia 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 
