Reports to the Board of A griailtttre . 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. 4. 



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 



