February, ’23] 
BRITTAIN: CABBAGE MAGGOT CONTROL 
63 
there was less actual loss as a result of the insect’s work than would have 
otherwise been the case. 
In comparing these results one with the other and with the check 
plot, it will be seen that we have here four treatments that give results 
that can be considered as good commercial control. The difference 
between them is not so great that it cannot be explained on the basis 
of experimental error. It is the opinion of the writer, however, that over 
a longer period of years the different treatments will stand in order 
of effectiveness about the same as in the table. 
Cabbage Maggot Continuation Plots 
Average of 3 yr’s. Results 
2250 plants per treatment; 14520 plants per acre 
Material Strength Per cent Weight Price Net Profit 
Destroyed Harvested Received per Acre 
(lbs.) 
Corrosive 
Sublimate.1—1000 .35 6800 $244.41 $1186.38 
Creosote 
Dust.1% .4 6478 225.49 1030.40 
Oil Dust 1% .13 6378 218.86 933.83 
Tobacco 
Dust.99% .44 6645 243.34 1163.33 
Corrosive 
Sublimate.1 % 
Check. 35 2148 78.10 356.12 
Cost of raising 14520 cabbages and preparing for market $391.80. 
Trials of New Materials 
Each year we endeavor to test a certain number of new materials 
and owing to the excellent results obtained from creosote oil used as a 
dust as a control for cabbage maggot, it was decided to endeavor to test 
the different main types of products that enter into the composition of 
this material, since, to secure the different ingredients as pure chemicals 
was not possible. The creosote oil used in these experiments is said 
to consist of the following:— 
1. Liquid neutral hydrocarbon oils. 
2. Pitch and high boiling hydrocarbons, such as phenanthrene. 
3. Naphthalene. 
4. Tar acids or cresylic acid. 
5. Pyridine bases. 
The Barrett Company furnished us with samples of these ingredients 
and some others. In addition we obtained a liquid which, for conven¬ 
ience, we have called “gas tar,” which is a waste product from the gas 
works at Halifax. This material is ordinarily designated “ammonia 
