THE IMPORTED CABBAGE WEBWOBM. 43 
Another method was tested by Mr. Simons. He captured many 
of the moths with the aid of a barrel having all but four of the 
staves sawed out, leaving 4 inches from the bottom to form a 
tub in which to hold water. From the top of this a light was sus- 
pended which attracted the moths. In this way he caught a great 
many insects in two seasons. The light barrels, as he terms them, 
were jilaced on seed beds of cabbage. 
A thin scum of kerosene was used in this experiment, but it is sug- 
gested that this be eliminated in order not to destroy the predaceous 
insects, such as ground beetles and parasites, which are practically 
certain to be attracted. This suggestion is made in view of the 
fact that the destruction of one beneficial ground beetle or parasite 
is equivalent to the destruction of, perhaps, from 20 to 100 injurious 
insects. The predaceous and larger parasitic insects can be easily 
picked from the water, and though they may be apparently dead, it 
will soon be seen that they recover and crawl away. The moths are 
not apt to recover. 
There can be little doubt that Bordeaux mixture sprayed on the 
plants when they are first set out, or when they first appear above 
ground, and continued at intervals of a week or two, should act as a 
deterrent of attack. It is advisable, therefore, in using an arsenical, 
to employ Bordeaux mixture as a deterrent. "Where cabbage and 
similar plants, liable to infestation by this insect, are set out from 
sash or cold frames, dipping the plants in a solution of arsenate of 
lead, prepared at the rate of about 4 pounds of the arsenical to 50 
gallons of water, should be useful. 
Among other remedies which may be suggested for employment, at 
least on a small scale, are the following: 
Planting an excess of seed with the aim of afterwards destroying 
the plants which are injured by the webworm beyond redemption. 
Fall plowing, a standard remedy for many insects. 
Clean culture, or the maintenance of the cabbage or other fields 
throughout the season free from weeds, especially cruciferous weeds. 
and prompt destruction of dead or dying plants during the season 
and the removal of all cabbage heads, stalks, and other refuse. All 
cruciferous crops should be treated in a similar manner. 
The refuse material, including hopelessly injured cabbage heads 
and other crucifers, should be gathered in piles and promptly burned. 
The addition of straw or similar dry material will aid in ignition. 
