In 1911 there was a brood of seventeen-year cicadas in several counties
in the eastern part of Pennsylvania. The relations that these stings
bore to blight infection have been studied near Lehighton. Many counts
were made on trees and sprouts. While only 4.3 per cent. to 10.4 per
cent. of all stings were found to be infected with chestnut blight,
from 86 per cent. to 93.8 per cent. of all infections were in stings.
This cicada injury was studied where the blight seemed most abundant.
In the same tract where blight was less prevalent, other counts were
made with less striking results. These observations would seem to show
that blight infection is influenced considerably by the number of
wounds made, but that infection many times does not take place through
a wound although seemingly appropriate openings for catching blight may
be present.