248 
JOURNAL OF ECONOMIC ENTOMOLOGY 
[Vol. 17 
Table II. Effect of Rains 
Date of 
Application 
Place 
Rain¬ 
fall 
In. 
Period of Rainfall 
% 
Kill 
May 
15, 
1920 
Carbondale 3.97 
May 16-21, six consecutive days of 
rain 
77%* 
Sept. 
1, 
1920 
< t 
1.23 
Aug. 26-31, 4 days rain out of 6 
100% 
Sept. 
10, 
1920 
Farina 
3.52 
Sept. 8-15, 8 day period, with 7 
days of rain 
100% 
May 
2, 
1921 
Anna 
2.71 
Apr. 26-May 2, 7 day period, with 
5 days of rain 
100% 
Sept. 
28, 
1921 
Ozark 
3.82 
Sept. 24-27, 4 consecutive days 
rain 
100% 
Lot 1 
100% 
“ 2 
Sept. 
12 , 
1921 
Anna 
2.09 
Sept. 1-11, 11 day period, 9 days 
of rain 
100% 
Oct. 
12, 
1922 
Carbondale 2.92 
Oct. 6-11, 6 consecutive days of 
100% 
Lot 1 
rain 
100% 
“ 2 
M ay 
23, 
1923 
Ozark 
4.27 
May 12-19, 8 day period, with 7 
days rain, then 3 days inter- 
80% 
Lot 1 
mission, then 
85% 
“ 2 
1.05 
May 23-31, 8 consecutive days 
Sept. 
1 , 
1923 
Carbondale 
3.01 
Sept. 1-7, 7 day period, 6 days of 
rain 
100% 
Oct. 
13, 
1923 
< i 
5.57 
Oct. 16-19, 4 consecutive days, 
80% 
Lot 1 
following 2 dry days 
£2% 
“ 2 
Compared with 78% in dry period two weeks before. 
Realizing that if this new material was to be of much value to the 
growers, it must be used on trees younger than 6 years old, we begun in 
the spring of 1920, with much trepedation, to treat 5 year trees. At 
first it was thought that some little injury resulted, as small, some¬ 
what circular brown areas were found where the chemical might have 
affected the bark, but these areas were also found on untreated trees, 
both at that time, and every year since. Finding no apparent injury to 
5 year trees, we moved our experiments in the fall of 1920 to 2, 3, and 4 
year orchards, with equally good results. For the next two years, both 
fall and spring we treated 1 year trees, in no case causing injury. We 
usually used oz., per tree, but in two different orchards applied doses of 
\J /2 oz., to blocks of 10, 1 year trees, with no ill effects. 
Beside this experimental evidence, we have many acres of one year 
peach trees in Illinois which have been treated by the orchardists with 
no reports of injury. 
The fact that young trees have not been injured in Illinois may be due 
