8 CIRCULAR 523, U. S. DEPT. OF AGRICULTURE 
TABLE 3.—Results of laboratory tests of various organic compounds used as insecticides 
against codling moth larvae—Continued 
NITRO AND NITROSO COMPOUNDS 
c Apple plugs Stand- 
: Gare | SPEsY i) Source, = See aed 
Compounds rior apph : of error of 
cations | larvae r ¢ | percent 
Total |Wormy| Stung wormy 
5 ‘ Number Number| Percent| Percent 
2, 2’-Dinitrobiphenyl, C12HsNa0O4.__-_--__-_-- 8 2 A 49 82 0 15.8 
Dinitronapthalene, Oe OI BIINILOV LS se Sd 3 1 L 35 V7 3] +10.4 
p-Nitrobiphenyl, Cy2HaNO3___._____-_____ 3 1 L 106 87 5 +4.1 
1-Nitroso-2-naphthol, CioH7NO3___________-_- 1 1 L 90 42 3 | acs ew 
p-Nitrophenylacetonitrile, CsHgN203__-__-___ 12 2 A 52 81 0 +5.8 
PHENOLS AND PHENOL DERIVATIVES 
N-Acetyl-p-phenetidine, CioHigN O3__-_----__- 3 1 L 79 84 0 +4.9 
p-Aminophenol, CsH7NO____._-....-.__----- 2 1 A 91 57 (ig 2eeee 
1,1’-Bi-2-naphthol, C2sH1403____-_--_--.--_-- 3 1 L 90 87 0 +4.1 
p-bromphenol Ces BrOk sae ee =< 8 2 A 50 84 0 +5.8 
y-Bromopropylpheny] ether, CpH1BrO____.- 15 2 A 40 90 0 +5.8 
o-Cyclohexyl] phenol, Ci2:H1sO___._----_--- 2 12 2 WwW 48 G6 0 +43. 5 
Diamylhydroquinone, C3¢6H2509______-___.._- i 2 WwW 52 69 4 +7.3 
4,6-Dinitro-o-cresol,? C7 HgN2O3__._____________ 4 1 WwW 94 0 03 |S eee: 
4,6-Dinitroso-resorcinol, CeH«N204__.___-._--_ 1 1 WwW 89 75 1 +5. 7 
p-Hydroxybenzophenone, Ci3Hi902____-_____ 3 1 L 107 93 2 +2.5 
2’-Hydroxy-2,4-dinitrodiphenylamine - 6- car- 
boxylicacidc© rikeNsO7= ee 3 1 L 08 86 1 +4.1 
2-Methyl-4,6-dinitroanisole, CsHsN2053_______ 10 1 L 97 25, 2 +4.8 
Methyl-l-naphthy] ether, Ci:;HipO___..-___ 12 F} EN IS 43 $5 2, +3.9 
Pentachlorophenol, CsHOCIs____-_-___.-_____- 3 Tee 1G; 51 2 a 4 +5. 4 
Salol CibytO7- 2a ee ee ee 1 2 A 41 98 0 +3.5 
2,4,6-Tri-iodophenol, CeHsIzO_____________-_-_ 12 2 WwW 45 96 4 +3. 5 
2'6=X<vlonol,. © see Oe ae en ee eee 12 2 A 41 90 0 +6.5 
THIOCYANO COMPOUNDS 
p-Dimethylaminopheny] ester of thiocyanic 
ACTF ALO ELTON gS ee a ee ee ee 4 1 Ww 87 58 j fi] PRE eee 
p - Phenyl - a@ - thiocyanoacetophenone, 
OipAiniNOS Sei Ses se ee eae ee 3 ft L 91 84 1 +4.1 
Tetrahydrolinalyl ester of thiocyanic acid, E 
COTS SNES Re og Cel a meres Aer Se 15 2 A 39 95 3 +3.9 
THIOCYANnOgena (GINS) sie e eeee ae eee 1 1 L 38 90 9 6. 5 
a-p-tolyl-ethyl ester of thiocyanic acid, 
Gc EEGINIS ts eee hee i ae Se eee, 12 2 W 48 71 19 +8. 1 
1 Dilution 5 pounds to 100 gallons. 
DISCUSSION 
From an examination of the data presented in table 3 it is evident 
that most of the compounds tested were ineffective. In some instances, 
however, this may have been due to the fact that the physical manner 
or condition in which they were used was not the best possible. 
Only 17 compounds gave 50 percent or less of wormy apple plugs. 
These are as follows: Thiocarbanilide, 47 percent; acetone semicarba- 
zone, 46 percent; p-nitroso-dimethylaniline, 40 percent; dibenzothio- 
phene, 26 percent; thioxanthydrol, 34 percent; thioxanthone, 41 per- 
cent; phenothioxin, in four tests, in which different kinds or quanti- 
ties of the same carrier were used, gave 43, 9, 6, and 5 percent; 2-thio- 
coumarin, in three tests, in each of which a different carrier was used, 
the percentage wormy was 0, 24, and 6; diphenyl! disulphide, 40 per- 
cent; 4,6 dinitro-o-cresol acetate, 10 percent; p-bromobiphenyl, 27 
percent; 2-phenyl-benzoxazole, 8 percent; 1-nitroso-2-naphthol, 42 
percent; 3,5-dinitro-o-cresol, 0 percent; 2-methyl-4-6-dinitroanisole, 25 
percent; pentachlorophenol, 32 percent; and 3,4-benzocinnoline, 8 
percent, : | 
