1919 



ENTOMOLOGICAL SOCIETY. 



67 



THE CABBAGE EOOT MAGGOT {CHORTOPHILA BRASSWAE). 



H. C. HuCKETT, O.A.C., GUELPH. 



A study of the life-history and control of the Cabbage Maggot (Chortophila 

 brassicae) was undertaken this year under Prof. Caesar's guidance. The study 

 is still far from completion but some interesting results from different control 

 methods have been obtained. The most important of these is, that on the whole 

 corrosive sublimate has given better results than discs even where discs have been 

 cleaned after each cultivation. Similar good results have been obtained with 

 corrosive sublimate by the representatives of the Vegetable Branch, Department 

 of Agriculture, Toronto ; in fact they made the suggestion that led to our testing it. 



Another interesting feature was that round discs, with a round hole in the 

 centre and a slit leading to it, proved equally as effective as the hexagonal discs 

 with the star-shaped centres and slit leading to this. Consequently in the tables 

 both discs have been classed together. 



Tests were also made with tobacco dust and lime and also with tobacco dust 

 and sulphur. The results were promising, but much further work will be required 

 to determine accurately their value and best method of using. 



Table Showing Results of Experiments in Control of Cabbage Maggot 



AT Burlington 



Method of 

 Treatment. 



4) OJD 



Corrosive sublimate. 



Check 



Discs, both round and 6- 

 sided. Earth remov- 

 ed after cultivation. . . 



Discs, both round and 

 6-sided. Earth not re- 

 moved after cultiva- 

 tion 



Check 



2 



47.9 



6.1 



34.0 

 38.9 



