18 
BULLETIN 1439, U. S. DEPARTMENT OF AGRICULTURE 
On June 26, two days later, in the plot sprayed with the stronger 
mixture, young, tender growth on red oak was found to be badly 
burned, and wild cherry foliage somewhat less so. On June 28 these 
injuries were more severe, especially in the case of the wild cherry, 
a number of leaves having suffered so badly that they had fallen off', 
and the fruit which had been touched by the spray had become dis- 
colored and injured. On July 2 many wild cherry leaves had fallen 
off and some of them had turned entirely black. Slightly more 
burning was noted from time to time for the rest of the season 
(fig. 14). 
The foliage sprayed with the weaker mixture suffered less injury. 
On June 26 and 28 the wild cherry leaves were slightly burned, and 
much more severely 
on July 2. As in the 
case of the other plot, 
the injury progressed 
slightly during the 
season. 
CORN OIL 
In the Watchung 
Ridge area at Somer- 
ville, N. J., slighi 
burning was observec 
on dogwood foliage 
sprayed with the mix- 
ture containing corn 
oil, but no injury was 
noted on any of the 
other trees. Slighi 
burning was noted on 
some of the foliage in 
the plot in the sauu 
area sprayed with th( 
mixture containing no 
adhesive, so that the 
injury here may not 
have been due to the 
corn oil. No othei 
injury was found in any of the other plots, either at Somerville oi 
Saugus. 
TESTS WITH RAW OILS 
Fig. 14.— Foliage burned by proprietary miscible oil, diluted 
On August 7, 1924, to determine the effect of the direct application 
of raw oils to foliage, linseed oil, fish oil, and corn oil were sprayed 
separately in a raw state upon cherry, oak, and gray birch foliage on 
selected trees at Melrose Highlands. The trees were located at the 
edge of a woodland and in the direct sunlight. The spraying was 
done between 2.30 and 3 p. m., the temperature in the shade being 
96° F. All of the oils spread over the entire surface of the foliage to 
which they were applied. The foliage was examined August 9 at 
10 a. m., all being found in good condition. It appeared waxy, and 
