TOXICITY OF ORGANIC JNSECTICIDES TO CODLING MOTH 3 
Carriers for the insecticide materials 
1= Water. 
2= Water-+ bentonite, 2 pounds to 100 gallons. 
3= Water-+ bentonite, 4 pounds to 100 gallons. 
4—= Water-+ bentonite, 5 pounds to 100 gallons. 
5= Water-+ glycerin, 4 pounds to 100 gallons. 
6= Water-+ casein ammonia (1-percent solution), 2 pounds to 100 gallons. 
7= Water, 80 percent, + acetone, 20 percent. 
8= Water, 90 percent, + ethyl alcohol,’ 10 percent. 
9= Water, 90 percent, + acetone, 10 percent+ tannic acid, 8 pounds to 100 gallons. 
10= Water, 80 percent, +-acetone, 20 percent + bentonite, 4 pounds to 100 gallons. 
11= Water, 80 percent,+ ethyl alcohol,? 20 percent+casein ammonia (1-percent 
solution), 2 pounds to 100 gallons. 
12= Water, 80 percent, + ethyl] alcohol,? 20 percent. 
13= Water, 50 percent, + ethyl alcohol,? 50 percent. 
14=KEthyl alcohol,? 90 percent,+carbon tetrachloride, 10 percent. 
15= Ethy] alcohol.’ 
Sources of larvae 
L=Loceal, i. e., from Virginia or West Virginia. 
A= Arkansas. 
W= Washington. 
TaBLE 1.—FPercentage of infestation of unsprayed apple plugs by codling moth 
larvae in laboratory tests 
Apple plugs Standard 
Source of larvae es? ade 
Total Wormy Stung wormy 
Number Percent Percent 
Des Ae 2 2 RE eagerness eR ee Ree era eS aS NS Bi te ee DONC LO ir RS 7S Bs 03 (Cd (eps Pee a oe 
LN appa SEE ES 2 SER ane Bh NE een ear? Gm Se Senne ae 405 84 Ou Seamer eee 
VV fake ee trpecins i soe eter le eee ARS En 795 94 1 +0.8 
TABLE 2.—Results of laboratory tests of lead arsenate against codling moth larvae 
Apple plugs Standard 
: Spray | Source error of 
Carrier applica- | of percent 
tions | larvae | motal | Wormy Stung | wormy 
Number Number | Percent | Percent 
eee oe ee eS ee vy kes B 985 25 fai ae A 
71 = ey Be Pe SN ee A a eres 105 18 ahi aoarntss 
Fen eee Ss get Pee ae ee tl 109 43 8 SP4is 
Fae Ses a ge pa a ruled 205 44 pt ay earen a 
Faris bh Sse ie eee a 1 A 99 53 rie pee eal 
Geeta haere NE |) AW 190 37 Rol Sree: 
fiend ie ae eete eF Tl ds 2 iD 47 11 4 +4.5 
ee Sah he Sd ee PE eee a Dil 2 om 38 26 16 +6.8 
7 ran Soe © ra Oe 5i|) mee 39 46 5 +7. 1 
Tie eu a a = oe ee Pal 31 48 13 6. 4 
Ty aa aati o> ee i ee 2 A 78 65 5 +5. 8 
TG eR AE Nee we 291 W 485 46 10 24.7 
ii sone eee vies fey Seen Ga iaemet ae 2| W 91 45 7 +45 
pst. ra a a ; 2| W 109 63 3 +4.5 
eee ree oe a | We er ae i a, 
3 The ethyl alcohol was 95-percent strength. 
