37 - 
Insect- and Stage 
Homoptera (cont.) 
Aphiidao (cont.) 
Aphis helianthi Monoll 
Preparation 
Effect ivonoss 
Extract in water Effective 
Reference 
Mclndoo, Sioverr 
and Abbott (66) 
in 1919 
Ditto 
Ditto 
Aphis modicaginis Koch 
(cowpea aphid) 
Aphis norii Fonsc. 
Pov.'dor in water Effective 
Powder as a dust Effecti^'C 
Powder in v;ater Effective 
(1:250) 
Com'l extract 13^^ control 
(1:500) 
Ditto 
Ditto 
Castillo (18) 
in 1926 
Do Oiig and 
Vrnite (26) 
in 1924 
Aphis pomi Dogoer 
(apple aphid) 
Ditto 
PoYfdcr in v/ater Effect ivo 
(1:400) 
Pov;dor + hydrated Ineffective 
lime (1+4) as a 
dust 
Kclsall ot al. 
(54) in 1926 
Ditto 
Ditto 
Powder as a 
dust 
Effective 
Mclndoo, S levers 
and Abbott (66) 
in 1919 
Ditto 
Aphis rumicis L. 
(bean aphid) 
Ditto 
Ditto 
Powder in water Effect iv© 
(1:1660) 
Powder in water Inoff active 
Extract in v;ater Slow and uncertain 
(equiv. to 0»5 
to 4^ root) 
Fresh root 
Ineffective 
Ditto 
Durham (27) 
in 1926 
Fryer ct al. 
(33) in 1923 
Gimlotto (45) 
in 1923 
Ditto 
Ditto 
Pov/der in water 100^ kill, 
(1:200) but slow 
Powder as a dust Effective 
Kelsall et al . 
(54) in 1926 
Mclndoo, Si overs 
and Abbott (66) 
in 1919 
