awe Lis 
cides and the sprays as both larvicides and ovicides, All of the ap- 
lications were directed against the ‘second generation of D. grandio- 
sella, as this stage causes the most severe damage. The following 
tables show the results obtained with the various materials over the 
period 1929 to 1933, inclusive. These results were based on the per-— 
centages of stalks tunneled, and not on the esi hain of borers 
killed. 
SPRAYS 
:Larvae in in-: 
Kind. :fested Mites 
: : of ease in plots 
Material _; : SE spree Treateds Check: Control 
ie ae oo 
Misciblo oil Se gk pak ath cant ey oem foto: 17. ev 45 pai 
; me, Cie : : 
MOP ONL .... shee wee See “1.0 ® do +: , UO. «cy fee 
cE Os oa : do +: 455- : 45 ¢ nome 
Meee eri tsion..:......2...-..2L.0 fitor ss H6e- 29th ee 
NN eo. ie eh wee daa ines eb deg 0 f do .: “55 sell) Gee 
Mee Ol, ........ Sas sade ie eee Ps 26.0 ‘ , doo: 34. ¥ Uh) See 
Memeeerrrow O1l....:...0..0...00e? 21 oz.to 5 “do. : 49°" Hh “Siiiomte 
Meeeiplc o11 (1 appl.) ...+....3 '1.0 percent swdor: 37° 14a ae 
Semeeapie o11 (2 appls..) ....... =i. % do: a ef Bs ly cee 
Miscible oil (3 eppls. Pulao are) do ls forge +; SRP eee 
Ee eee rl. Lbs. to 0 100" sLarvie::° 36°: : 45>: 20 
i : : cide E : 
Lead arsenate < 1 : - “te : 
Mean fish-oil ‘soap...... Pcie teulbey bo 100" do. 2-431 9S UG 
Mm Oryolite and cnt Sas : : ce 
Mumeeer-o1l soap...'.......%.. be Outhay BostOO - $i dow Cee sl! aoe 
Barium fluosilicate , 13 : “ : 
Meme reciHO1), SOD... cece seca: Oet wes tO 100.15. do tes at 54 pues 
sodium fiuosilicate : 1: : 7 jpumice 
Memaepish-oil soap........-: Merosibsesto 200 as do <0" 2th ee 

ae 
Gallons of water 

