File:Contributions from the Botanical Laboratory, vol. 11 (1934) (20065919864).jpg

Title: Contributions from the Botanical Laboratory, vol. 11
Identifier: contributionsfro11univ (find matches)
Year: 1934 (1930s)
Authors: University of Pennsylvania. Botanical Laboratory; University of Pennsylvania. Morris Arboretum
Subjects: Botany; Botany
Publisher: Philadelphia : (s. n. )
Contributing Library: Penn State University
Digitizing Sponsor: Lyrasis Members and Sloan Foundation

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220 JOURNAL OF ECONOMIC ENTOMOLOGY (Vol. 26 U Ph o o PL, (N
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i vil, thus indicating the presence of the insects before the trees had died. Possibly the weevils may have hastened somewhat the death of the trees. Two white pine trees, between six and seven feet in height and which were completely girdled with stem cankers of blister rust within one foot of the ground, were within six to twelve feet of the stumps of the Pitch pine saplings which were cut early in the summer of 1931 and which were mentioned above. The root crown of one of these white pine trees on which the needles were quite yellow, had a considerable amount of dried resin and resin-in-filtered soil and had been quite heavily infested with weevils. The needles on the other tree were only slightly off color. This tree had apparently made an average height growth in the season of 1931. An adult female Pales weevil was punctur- ing the bark of the root between two and three inches below the surface of the ground. Ten healthy white pine trees in this same general vicinity were carefully examined. The soil was removed so as to see beneath the root crown. No weevils or traces of the same were found. The association of the weevils was not surprising, since the writer had found in the latter part of June 1931, adults, larvae and pupae associ- ated with the root crowns of trees of Pinus resinosa Ait which were quite heavily infected with Armillaria mellea near Peru, Clinton County, New York. He had also observed occasionally near Norwich and near Springwater, N. Y., in the latter part of July and the early part of August, larvae and adult weevils which were apparently Hylobius pales and which were associated with the resinous crowns of white pine trees which were about twenty years old and in forest tree plantations. Mention should be made of the fact that the land at the time of the establishment of the Warren County forest tree plantation consisted of old abandoned fields and had no tree growth of any sort, with the possible exception of a few sapling pitch pine. The soil is a very light sandy loam. In June of 1927 the writer called the attention of Dr. E. P. Felt, then State Entomologist for the State of New York, to a very severe weevil infestation in the crowns and roots of Scotch pine trees (Pinus sihestris) in a forest tree planting of this species near Ballston Spa., New York. Later in Bulletin 274 of the New York State Museum, 1928, in dis- cussing this infestation. Dr. Felt states that "if' (Pales weevil) "ap- peared in a new role in a recent planting of Scotch pine some 15 years old at Ballston Spa." He seemed to be of the opinion that the behavior of Pales weevil in this plantation had been acquired in the presence of an exotic species. At this time the writer had not observed this insect attacking trees of the pitch pine which occur to the North and East

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