_ 52 - 
InsGct and Stage 
Diptcra (conto) 
iuithonyiidao 
Hylemya ant i qua Moig. 
(onion maggot), young 
larva G 
Ditto (full-gro"wn 
larvae) 
Ditto (young larvao) 
Preparation Eff octivonoss 
Ro for once 
Pov;der in water 100^0 kill 
(1:335) 
Powdor in water I'o kill 
Ditto 
Effective 
Brittain (11) 
in 1921 
Ditto 
Brittain (13) 
in 1924 
Ditto (mature larvao) 
Ditto (larvae) 
Ditto 
Ditto 
Pov/der + sect 
(1+2.) as a dust 
Pcwdor + soot 
(1+2) as a dust 
Ineffective 
Inoff cctivc 
60>'j clean 
onions 
Ditto 
K.M.Smith (85) 
in 1925 
Smith and 
Wadswcrth (86) 
in 1921 
Hylemya brassicae 
Eoucho (cabbage 
maggot) 
Ditto 
Ditto 
Ditto (larvae) 
Ditto 
Powdor + clay Effectiv' 
(1+1) as a dust 
Pov\rdGr in water 
(1:333) 
Pov/der in water 
(1:333) 
Powdor in water 
(1:333) 
Pov;dcr + soot 
(1+2) us a dust 
Effective 
Ineffective 
Ineffective 
Ineffective 
Brittain (11) 
in 1921 
Ditto 
Brittain (12) 
in 1922 
Brittain (13) 
in 1924 
K.n. Smith (85) 
in 1925 
Culicidae 
Aedes vexans Meig., 
larvae 
Ditto (larvao) 
Powdor Justed Effective 
on water (2 to 3 
lbs. per acre) 
Powdor dusted Effective in 
on v;ater (3 lbs. 7 hrs. 
per acre) 
Gibson (41) 
in 1927 
Twinn (96) 
in 1927 
