ON THE CAUSE AND PREVENTION OF THE INJURY 
TO FOLIAGE EY ARSENITES TOGETHER WITH A 
NEW AND CHEAP ARSENITE, AND EXPERT 
MENTS ON COMBINING ARSENITES WITH 
SOME FUNGICIDES. * 
By. B. W. KILGORE, 1 st Assistant Chemist. 
Early in July, 1890, investigations were commenced with a view 
of obtaining information as to what insecticides and fungicides may 
be mixed without impairing the usefulness of either, or endangering 
the foliage to which they are applied. 
It is not the purpose of this article to explain how to apply insec¬ 
ticides and fungicides, nor to tell which particular one should be 
used to destroy any particular insect or fungus. This is the work of 
the botanist and entomologist. These investigations were intended to 
give him material to aid him in his work. 
Results, a great many of which ' are similar to those presented, 
though not obtained altogether in the same way, were recently pub¬ 
lished in Bulletin 10, of the Iowa Station. I have no desire what¬ 
ever to question Mr. Gillette’s priority in arriving at and announce 
ing his conclusions, but it is a matter of justice to state that all the 
conclusions and nearly all the data here submitted were independently- 
obtained b}^ me before any notice of Mr. Gillette’s work reached me.. 
The three main questions which confronted us in the work were: 
1. What is the cause of injury to foliage from arsenites? 
2. What will prevent this injury? 
3. Will the combination of arsenites with fungicides injure the 
insecticidal or fungicidal properties of either? 
The subject as here treated has to do almost entirely with the first 
two questions, and work has been devoted to establishing them well. 
The investigations were first conducted on a qualitive basis, as 
that was quicker, and the botanist of the Station desired the results 
for use in his work. The facts elicited by this preliminary work 
proved of such interest that a report, in brief the same as here given, 
was made for present use, and further experiments on a quantitative 
basis were begun that figures might be presented to bring out more 
clearly the former results. 
* It is due Mr. Kilgore to say that the experimental work involved in this bul¬ 
letin was completed in July, 1890, and that the manuscript was prepared exactly 
in its present shape in September, 1890. For various reasons, it could not be sent 
to the printer before the present time. In view of similar work being commenced 
elsewhere at a date later than the above, it is just that Mr. Kilgore should have 
the credit of the priority for such work as may be considered new .—The Director. 
