Reports to the Board of Agriculture. 35 
The only other plan found to be successful is the use of bisul- 
phide of carbon or carbolic acid, the former injected into the ground. 
This treatment on a large scale would be costly in Great Britain 
and need not be referred to here. 
Gas-lime has been found of benefit, but to be so it has to be put 
on strong and may damage the next year’s crop to some extent ; at 
other times it is a complete failure. Gas-lime to be of use must be 
put on so strong that the land often requires a year’s rest. 
All cabbage stumps and other roots after an attack should be 
burnt. 
A dressing of superphosphate of lime has been found beneficial 
on the Continent. 
Broad-casting soot and lime around the plants soon after planting 
Fig. 
Stem of plant passing through card disc 
lying close on the ground. 
A, Star-shaped slit so as to allow stem 
to pass through card ; B, Slit to push 
stem up to A. 
out has also met with success in preventing the fly from laying eggs, 
but is by no means certain in action. 
By far the best plan is to give up growing cabbage for two years 
on the land and plough deeply, or if hand cultivation dig two spits 
deep. 
If it is necessary to continue to grow cabbage again and again on 
land, attention should be paid to the method of discing the plants 
when being set. A small amount of soot and lime may also be put 
in at dibbling time with the young plants. 
Carbolic acid in soft soap and water as follows was found the 
next best remedy and preventative after the tarred discs in a large 
series of experiments in America. 
D 2 
