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JOURNAL OF ECONOMIC ENTOMOLOGY 
[Vol. 16 
landing fields are not always accessible and that they are less likely to be 
accessible in the very areas where airplane spraying would be most 
practicable. With the development of aeronautics, however, not only 
will progress be made in the perfection of landing apparatus and methods 
but additional fields will be constructed for the accommodation of the 
public. 
The final defect to which I wish to refer pertains to the type of plane 
and hopper used. It is the general opinion of those experienced in 
aviation matters who were connected with this test that the Curtiss 
JN-6 is not a suitable plane for this work. The writer will not attempt 
a detailed discussion of this matter but will state that the general 
opinion seems to prevail that a plane with larger carrying capacity and 
perhaps of an entirely different type of construction should be em¬ 
ployed. It would seem that if a moderately *slow plane capable of 
carrying two passengers and a minimum load of 500 pounds of powder 
could be had for the work it would much more nearly fill the require¬ 
ments. This amount of poison should be sufficient for 30 to 50 acres of 
woodland, and thus it would be entirely practical to use a landing field 
even as far as 25 miles away if with each flight such an immense territory 
could be covered. 
In addition to the substitution of a mechanically driven release in¬ 
stead of the hand apparatus as previously discussed, the hopper should 
be equipped for more rapid distribution—I should judge at least five 
times that of our present machine. 
Conclusion 
Each season we see some of the more notorious shade and forest 
insects steadily extending the area of infestation in the United States 
and at the present time a most serious situation exists in the apparently 
imminent invasion of some of the great wooded playgrounds of the 
land. Dusting by airplane at least offers a possible means of check and 
when one considers the degree of success which has attended the Ohio 
work it seems highly worth while that this method be given a thorough 
painstaking trial. 
The writer will admit that at first thought the plan seems highly 
impracticable, but since the work of 1921 and during that of the present 
season many fellow workers have expressed the belief in no uncertain 
terms that the method seemed most thoroughly practicable and would 
stand the test of time. Almost all of the observers who have witnessed 
the Ohio trials have been highly skeptical before the work was done, 
