Concord, Mass.
1910.
July 17
[July 17, 1910]

Gypsy Moth conditions

  I went over our entire place to-day, studying Gypsy
moth conditions. Some of the larvae are still feeding and
many are yet in the pupa cases but the majority have
hatched and mated and the females are laying or have just
laid, their eggs. The males were to be seen everywhere but
not numerously except where there were females. When the 
latter were abundant the males were in thousands, literally
filling the air and tiring one's eyes and senses by their ceaseless 
flickering flight. They seemed to generally outnumber the females.
The general results of my observations may be summarized as follows: -
Ball's Hill. - Multitudes of "wilted" caterpillars but not many
healthy ones and comparatively few moths of either sex. I
doubt if the trees will be stripped again next year even if
nothing be done to protect them. The oaks have suffered badly 
and the pines considerably, this season, especially along the
crest of the ridge and on its northern slope.