. Bulletin. Forests and forestry. 82 College of Forestry The great majority of the larvae are practically full grown (Fig. 37) and have taken up their winter quarters in the inner part of the outer bark by the advent of cold weather. Here they pass the winter well protected from both cold and excessive moisture. They transform to pupae in the outer bark during May and June of the following year. Fig. 40. Various phases of the work of the brood of the hickory bark beetle, a. Appearance of the engraving made on the sapwood and in the bark (6) by the young larvae, c and d. The engraving on surfac
. Bulletin. Forests and forestry. 82 College of Forestry The great majority of the larvae are practically full grown (Fig. 37) and have taken up their winter quarters in the inner part of the outer bark by the advent of cold weather. Here they pass the winter well protected from both cold and excessive moisture. They transform to pupae in the outer bark during May and June of the following year. Fig. 40. Various phases of the work of the brood of the hickory bark beetle, a. Appearance of the engraving made on the sapwood and in the bark (6) by the young larvae, c and d. The engraving on surface of sapwood and in the bark, when the larvae have reached full growth and have entered the outer bark for hibernation, e. Engraving on sapwood of a thinner barked limb. In such cases the sapwood is deeply grooved while in the thick barked trunk it is barely etched. /. ''Shot holes " in the bark made by the young adults in emerging. SUghtly less than one-third natural size. (Original) and emerge to start a new generation in June and July. The various dates mentioned here hold good only for Syra- cuse and vicinity — farther south the different stages would appear Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original State University College of Forestry at Syracuse University. Syracuse, N. Y.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectforestsandforestry
