1342 Tur Veceraste Inpustry 1n New York Srate 
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 
a 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 
Fic, 396.—(A) TarrED PAPER CARD Prop- a l Fl ‘ 
ERLY Pur ON; (B) A Carp Caretessty HeXagona tarred paper 
APPLIED THAT WILL Nor PREVENT ecards about the stems close 
to the soil. These cards can be purchased ready cut from Joseph 
Harris Co., Coldwater, N. Y., at $1.50 per thousand. They can 
be quickly and economically applied in the field (Fig. 396). 
IMPORTED CABBAGE WORM 
The imported cabbage worm (Pontia rapa) 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 
