1342 The Vegetable Industry in New York State 



the plant, eating out small channels along the underground part 

 of the stem and the roots. If the maggots are present in any 

 numbers the plant will begin to wilt in a few days and eventually 

 will die. In three or four weeks the maggots become full-grown 

 and change to brown oval objects termed puparia, which are 

 usually an inch or so below the surface of the soil. In about two 

 weeks an adult fly emerges from each of the puparia and is soon 

 ready to deposit eggs for a second brood. The insect passes the 

 winter as a puparium in the soil. This insect is a serious pest 

 of cabbage plants in the seed-bed as well as of plants after they 

 are set in the field. 



Control. Plants in the seed-bed may be protected by setting 

 up boards on edge about the bed and then nailing muslin across 



the top. The dirt should 

 be heaped up around the 

 lower edges of the boards 

 in order to prevent the flies 

 from crawling under and 

 gaining access to the 

 plants. The muslin should 

 be removed about ten days 

 before transplanting time 

 so as to harden the plants 

 and prepare them for set- 

 ting in the field. 



Plants in the field are 

 best protected by placing 

 hexagonal tarred paper 

 cards about the stems closo 



Fig. 396. — >(a) Tat; red Paper Card Prop- 

 erly Put Ox; (b) A Card Carelessly 

 Applied That Will Not Prevent 



to the soil. These cards can be purchased ready cut from Joseph 

 Harris Co., Coldwater, X. Y., at $1.50 per thousand. They can 

 be quickly and economically applied in the field (Fig. 396). 



IMPORTED CABBAOE WORM 



The imported cabbage worm (Pontia rapw) is known as the 

 white cabbage butterfly and although it is common now wherever 

 cabbages are grown in the United States, it is a European insect 



