246 Report OF THE HORTICULTURAL DEPARTMENT OF THE 
’ 4 
me to believe that much damage is done in this way. Under 
some conditions lens action might aggravate bordeaux injury, 
and under some, possibly, it might do damage worthy of note, 
but the latter I regard as doubtful. 
INJURY FROM LIME. 
Many apple growers who have used an excess of lime attribute 
the russeting of the fruit, and some say the spotting and dropping 
of leaves, to the lime. I cannot find anything to substantiate 
this belief in the work of this season, where many trees sprayed 
with bordeaux mixture containing an excess of lime came under 
my observation, the excess ranging from the same amounts of 
copper sulphate and lime to four times as much lime. A Rhode 
Island Greening tree sprayed twice with sixteen pounds of lime to 
forty gallons of water, with an interval of ten days between the 
applications, showed no injury. Neither can I find any record of 
injury to the apple through the use of slaked lime. 
I have seen injury on the young leaves and shoots of a pear 
tree dusted with unslaked lime for the pear slug, but it had no 
resemblance to the spotting and yellowing of leaves through bor- 
deaux injury. In this case the unslaked lime caused the leaves 
and shoots to wither and dry up, and the leaves which were 
badly burned by the lime dropped almost immediately. It is 
barely possible that lime improperly slaked, or of poor quality, 
may injure the tender tissues of small apples or of young leaves, 
but it is doubtful if such injury is ever sufficient for consideration. 
IMMUNITY OF VARIETIES. 
Some varieties of apples are injured much less than others by 
bordeaux mixture and there is a wide range in this variation in 
immunity. Such variations are inherent in the variety and do 
not depend on season or other conditions.of environment. Fruit 
and foliage do not always show the same degree of immunity; 
that is a variety may be susceptible to the injury on the fruit 
and comparatively immune in the foliage, or the reverse. In 
1894 Beach* published from this Station a classified list of 
apples of which the fruit is injured by spraying. In the twelve 
years that have followed, it has been possible to revise and add 
to this list, especially favorable opportunities occurring in 1905 
and 1906; the following is the revised list: 

weDECACTIY LO. p.dt 12 
