CHEJIOTEOPIC TESTS WITH THE SCBEW-WOBJI FLY 
27 
PINE PRODUCTS 
Nearly all of the pine products are very good in repelling screw- 
worm flies. Although most of the meat treated with pine products 
showed infestation, this was by species other than Cochliomyia. 
FURFURAL MIXTURES 
All of the furfural mixtures are excellent repellents and are also 
effective in preventing infestation by Cochliomyia (but not by other 
species). 
COAL-TAR CREOSOTES 
The coal-tar creosotes are very effective in repelling screw-worm 
flies and also in preventing infestation by this species. 
BONE MEAL 
Bone meal repels five-sixths of the screw-worm flies normally 
visiting meat during the first day of exposure. 
BEST REPELLENTS 
The most effective repellents against the screw-worm fly are listed 
in Table 2 in the order of decreasing effectiveness. Only those 
materials whose coefficient of attractiveness is 10 or less, and in the 
tests of which not less than 100 flies visited the check jars, are con- 
sidered. The infestation at end of fifth day and emergence data are 
-also shown for each material in the table. It should be distinctly 
understood that these statements are not generalizations, but apply 
only to the tests herein described, and that under other conditions, 
especially when the substances are used on wounds, very different 
valuations might be obtained. 
Table 2. — Best repellents against Cochliomy 
ia macellaria 
Material 
Coeffi- 
cient ' 
Num- 
ber of 
treated 
jars 
1 Infesta- 
.treated ££ d 
Rebeck'/ - treated 
cnecKS jars oyer 
checks 
Emer- 
gence, 
treated 
over 
check 
jars 
Salicylic aldehyde (1) plus petrolatum (5) 





n 














2 | 0:113 0:2 
3 j 0:770 2:3 
1 0:455 1:1 
1 ! 0:455 0:1 
20:- 
Chloroacetophenone _. „ 
Chloroacetophenone (1) plus petrolatum (2) 
0:3 
0:1 
Camphor oil bv-product (1) plus bone meal (3) 
0:1 
Clove-bud oil (3) plus petrolatum (1) . 
1 
2 
4 
4 
4 
4 
2 
1 
10 
2 
2 
2 
2 
2 
2 
2 
0:455 1:1 
0:456 2:2 
0:160 4:4 
0:160 4:4 
0:160 4:4 
0:160 4:4 
0:456 0:2 
0:455 0:1 
0:491 8:10 
0:302 0:2 
0:302 0:2 
0:302 1:2 
0:238 2:2 
0:302 1:2 
0:302 0:2 
0:302 • 0:2 
0:1 
Clove powder (1) plus petrolatum (2)... 
Wood naptha ... 
0:1 
0:2 
Pine tar, heavy 
Pine tar, medium. 
Pine tar, thin ' ... .- . 
0:2 
1:2 
0:2 
Tine-tar oil, refined (1) plus petrolnmm (5).-. 
Pine-tar oil, refined (1) plus kaolin (3) 
0:1 
0:1 
Pine-tar oil, commercial 
Pine-tar oil, commercial (3) plus furfural (1) plus star 
anise oil (1) 
Pine-tar oil, commercial (3) plus furfural (1) plus 
camphor -sassy oil (1) 
1:6 
0:2 
0:2 
Pine-tar oil, commercial (3) plus furfural (1) plus a 
creosote dip (1) . . 
0:2 
Pine-tar oil, commercial (1) plus furfural (1) 
0:0 
Pine-tar oil, commercial (10) plus furfural (1) 
0:2 
Pine-tar oil, commercial (20) plus furfural (1) 
0:2 
Pine-tar oil, commercial (3) plus furfural (1) plus fennel 
oil (1) 
0:2 
i The figures in this column correspond to those in column 6 of Table 1, i. 
entire period. 
1 The sign (-) means no record. 
percentage ratio for the 
