THE CABBAGE MAGGOT 



15 



Table 9. 



Effectiveness of Dust Applications for Control of Cabbage 

 Maggot. Waltham, Massachusetts. 



Material, 

 Percent of Toxic 

 Agent, and 

 Carrier 



Applications 



Year 



Number Method 



Percent of Percent of 

 Crop Plants Com- Large and 

 mercially Medium 

 Uninjured Heads 



Naphthalene Flakes^ f 1931 



Naphthalene 100% -j 

 No carrier [ 



Cube Dust^ 



Rotenone .5% 

 Clay 



Derris Dust* 



Rotenone .55% 

 Clay 



Calomel Dust^ 



Calomel 2% 

 Colloidal Clay 



Calomel Dust^ 



Calomel 4% 

 Lime 



Calomel Dust 

 (home mixed) 



Calomel 2% 

 Talc 



Calomel 4% 

 Lime 



Calomel 4% 

 Talc 



'Naphthalene is composed of coarse flaky crystals and is not actually a dust. 



■Supplied by Ansbacher Siegel Corp. 



'Supplied by Bowker Chemical Co. 



'Supplied by Apothecaries Hall Co. 



*Poor heading of cauliflower due to factors other than maggot injury. 



Rotenone 



Rotenone-bearing dusts are not considered to be satisfactory for controlling 

 the cabbage maggot. Rotenone kills the adults and newly hatched maggots but 

 it loses its effectiveness in three or four days after application. In these experi- 

 ments a cube dust containing 0.5 percent rotenone was used in 1932 and 1933, 

 and a derris dust containing .55 percent rotenone was used in 1933. The cube 



