177 
on those growing under good light conditions. The shaded 
limbs on unpruned and neglected apple trees are more likely to 
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their foliage in the summer, such as siasauane results from the 
ravages of the gypsy moth. In suchi unripened 
wood sun-scalds badly. 
“Sun-Scorcu”’ 
‘Sun-scorch,’’ a term given to designate the burning of 
foliage, generally occurs in summer during periods when the 
soil is dry, and also is common to evergreens during warm windy 
defects in the root system which prevent root absorption i 
likely to give rise to sun-scorch. In tl f evergreens 
sun-scorch is not infrequently ascribed to winter injury and in 
Sun-scorch is common to 
maple, and is characterized oe a burning of the ae which 
a : : : 
ften become: er when stron: n ail. Since 
scorch occurs on the side of the tree coinci ith the 
direction revailing winds, the particular combinations 
of meteorological conditions which se this readily be 
det ne i nce w. tl s blowing at 
the rate of seventy-tw an hour from the northwest during 
May time when the soil was relatively dry and the leaves 
ae ee aig all of the eee of the rock- 
maples over a larg tion sun-s ed on the 
ra lar; were scorch: northwest 
side of the tree. ie another severe dry din summer 
when the wind was blowing at eighty miles an hour, the whit 
pines in southern New England which were suffering from a 
defective root-system were sun-scorched 
