104 
succeeded in raising three broods in one season in confinement, un- 
der what were probably optimum conditions, in the latitude of 
Chicago. 
Methods of Control. — Volunteer asparagus plants should be 
kept down in early spring, as they afford a good breeding place for 
the larvae. Since the shoots are cut for the market every day or 
two, the eggs which may be deposited on them do not have time 
to hatch ; and if the volunteer growth is kept down there will be 
little chance of any eggs hatching in the field. 
Fresh air-slaked lime, dusted on the plants early in the morning, 
while the dew is on, has been reported by Dr. F. H. Chittenden as 
destructive to all grubs with which it comes in contact. 
Arsenical poisons are of value upon plants that are not being cut 
for food, and possess the advantage of destroying beetles, as well 
as grubs. The application should be made at frequent intervals, or 
as often as the larvae reappear. Arsenate of lead or Paris green in 
water are excellent sprays for this purpose. Dry arsenicals are also 
effective — as Paris green mixed with lime, with lime and flour, or 
with land-plaster. 
CABBAGE AND CAULIFLOWER 
In Cook county gardens, cabbage and cauliflower rank in im- 
portance with such garden products as onions, cucumbers, and pota- 
toes. Not only are they among the most generally grown vegeta- 
bles, but they are peculiarly susceptible to insect attack. In Illinois 
I have found the following insects doing noticeable damage to these 
crops : the imported or green cabbage-worm, cutworms, the root- 
maggot, plant-lice, and flea-beetles. 
The Imported Cabbage-worm 
Poiifia vapcc Linn. 
(Picris rapcv) 
There is not a gardener who is unfamiliar with this common and 
destructive caterpillar. There are several "cabbage-worms," but the 
commonest is the larva of the ^vhite butterfly {Pontia rapcc) al- 
ways to be found flying around cabbages in the summer. It emerges 
early in spring, having passed the winter in the chrysalis or pupa 
stage. The greenish eggs, small, slender, and ribbed, are soon de- 
posited, usually singly, on the leaves of early cabbages or other 
cruciferous plants. The velvety green larva (Fig. 3, a) begins to 
feed ra\'enously on the leaves immediately upon hatching. It gets 
its growth in ten to fourteen days and becomes a chrysalis (Fig. 3, 
b), changing to a white butterfly (Fig. 4 and 5) some eight to twelve 
