THE CABBAGE MAGGOT. 



9 



a dozen or more that had originally been laid there." This 

 is most significant. This little agent calls for our respect in 

 this particular. Through its agency evidently the cabbage 

 maggot's numbers are materially reduced. Unfortunately we 

 have not this season found it abundant in all localities where 

 cabbages and cauliflower are found. 



A little rove beetle, Aleochara nitida, LeConte, is known 

 to devour large numbers of the maggot in various states and 

 in Canada, as well as occurring in Europe, but while it may 

 be present in Minnesota, we have not observed it. Another 

 Staphylinid larva, Mascochara valida is possibly predaceous 

 upon the cabbage maggot. It is probable that in our contest 

 against the cabbage maggot we are aided by many predaceous 

 and parasitic forms not yet known to us. 



FIELD EXPERIMENTS, I906. 



Fig. 6. — At work in a badly infested held. 



A large amount of work was accomplished in the field 

 during the spring and summer. It is evident, however, that 

 all experimental work on the part of the Entomologist, and 



