122 Beetles [CH. x 
is sufficient and in a large barn this covering is often 
necessary. 
It must be remembered that carbon disulphide is 
heavier than air and readily descends. 
Treatment should begin at the bottom of a building 
if several floors are being treated. After fumigation the 
bin or granary should be opened for two or three hours 
before entering the building as the fumes are poisonous. 
No naked light should be taken into the treated building 
as the fumes are highly inflammable. When empty the 
walls of the granary should be whitewashed, a little 
carbolic acid being added to the wash. All crevices in 
the walls should be stopped up to prevent the beetles 
from hibernating there. 
Gall Weevil or Club (Ceutorrhyncus sulcicollis). 
This pest may become very troublesome when it 
has established itself in market gardens where cabbages 
are grown annually. It attacks other members of the 
same order such as turnips and swedes, and in these 
cases indirect damage may be done, from the entrance 
of organisms which cause the roots to rot. When 
cabbages are attacked their growth is stunted, the 
leaves become yellowish, and in many cases the plants 
are killed. The presence of this pest may be recognized 
by the swellings on the underground portion of the 
stem in cabbages, and on the underground succulent 
part of turnips (see Fig. 35). These swellings give the 
name of “club” to the disease and sometimes lead to 
its confusion with finger and toe, which is caused by 
a fungus (see p. 35), or root knot, which is caused by 
an eelworm (see p. 170). Itis readily distinguished from 
these by examining the swellings of a diseased plant, 
