The Boll-Weevil Problem. . 29 
EFFECT OF METHODS OF CONTROL OF THE BOLL 
WEEVIL ON THE CONTROL OF OTHER INSECTS. 
THE COTTON BOLLWORM. 
The most important enemy of cotton in the United States, aside 
from the recently introduced pink bollworm* and the boll weevil. 
is the bollworm,? which has existed in this country for many 
years and frequently reduces the crop very considerably. Its 
annual damage to cotton in the United States has been conserva- 
tively estimated at more than $8,000,000. ‘This insect is also a very 
important enemy of corn, tomato, okra, cowpeas, and some other 
crops. Careful studies of the bollworm were conducted by Dr. A. L. 
Quaintance, of the Bureau of Entomology, in connection with large- 
scale field experiments in many localities. The conclusions drawn 
from this practical work were that the essential steps to be taken 
in the control of the boll weevil are exactly the ones that should be 
followed in the warfare against the bollworm. The following is 
the statement by Dr. Quaintance on this subject: 
The steps in the production of early cotton include the principal recommenda- 
tions for the growing of cotton in the presence of boll weevils. It is therefore 
seen that injury from the cotton bollworm and the cotton boll weevil may be 
best avoided by the adoption of one and the same course of improved farm 
practice. The spread of the latter species will render imperative the adoption 
of these methods in profitable cotton culture, and along with this change the 
ravages of the bollworm during normal seasons should become less and less. 
The development of weevil poisoning adds another interesting 
phase to the question of control of the cotton bollworm. Years ago 
experiments were conducted which showed that a certain poisoning 
procedure would control the bollworm, but it was found that the boll- 
worm damage was not sufficiently heavy to justify the expenditure 
necessary for this poisoning. Since the development of weevil poison- 
ing, however, it is interesting to note that the procedure recommended 
for the two insects is practically identical; thus satisfactory boll- 
worm controj should be secured as a supplementary benefit to be 
derived from weevil poisoning. 
THE COTTON LEAFWORM. 
The relation between the cotton leafworm ® or the so-called “army 
worm ” and the control of the cotton boll weevil deserves special 
attention. 
Years ago the efforts of entomologists and planters were directed 
toward some means of destroying the leafworm. The use of Paris 
4 Pectinophora gossypiella Saund. 
5 Heliothis obsoleta Fab. 
6 Alabama argillacea Hiibner. 
