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222 REPORT OF THE BOTANICAL DEPARTMENT OF THE 
The trees marked for particular observation were in the center 
ef an orchard of about 200 trees and the above descriptions were 
typical. However, it must be understood that this orchard was 
given good care and cultivation during the growing season. 
In most of the trees there were many small twigs that had 
been killed, and an occasional tree on which the foliage was not 
of a good color. But it certainly would have been unwise to 
remove all of the trees in this orchard upon the supposition that 
they were dead because of the discoloration of the bark and 
wood of the trunk and limbs. This orchard and the marked 
trees were examined again in the early part of June, 1905. 
Practically every tree was in good condition, had a good crop of 
large and well colored foliage and a large amount of fruit. 
The discoloration is, of course, a symptom of injury, and the 
stronger the discoloration the more severe the injury. But with 
peach and young pear trees the discoloration, even though very 
pronounced, is not a certain indication of death. 
No reliable symptom of fatal injury from frost was found that 
was applicable at the end of the winter. 
AGE OF TREES AND SUSCEPTIBILITY TO INJURY. 
With peach and pear trees there was a well marked difference 
in the degree of injury depending upon the age of the tree. 
Observations upon this point were made at many places, but 
most carefully upon a fruit farm of about 5,000 peach and an 
equal number of pear trees, at’ Milton, on the Hudson river, - 
where the injury was most severe. The elevation of this farm 
was very uneven, varying from 200 to 500 feet above sea level, 
and containing many “pockets” or “hollows.” The peach trees 
were from one to fifteen years old and the pear trees from three 
to twent'y-five years old. . 
Peach trees one year set were examined in March and showed 
only slight discoloration of the bark and wood. Late in Septem- 
ber, when last examined, all of these young trees were found to 
have made a splendid growth during the season, and a few that 
were cut! off below the snow line to have made a vigorous growth 
from the stump. 
Peach trees under. five and six years did not show severe cases 
of discoloration, though it was more marked on trees in low 
