Answer :
The reason for the eating of the leaves of the trees is the gypsy moths.
What are leaves?
The leaves are the photosynthetic parts of the plant. The leaves are exposed to the sun and are able to produce the food that is required by the plant. Thus, the food of the plant could only be produced at the leaves and a damage to the structure of the leave by pests would certainly have an effect on the whole plant.
The gypsy moths are known to eat the leaves of trees. We can see here that in many places, the leaves of trees could be eaten by the gypsy moths.
As such, the reason for the eating of the leaves of the trees is the gypsy moths.
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