. Bulletin - New York State Museum. Science. 732 NEW YORK STATE MUSEUM observed in the vicinity of the trees, and it was probably this species which preyed on the bark beetles. This is a striking- illustration of the value of woodpeck- 0tf^f4-:-<-Mjf^^^^ ers and their perseverance in Jigging \)Jvi//f$$wtl$KUSK out such small insects. These pupae were undoubtedly the progeny of the fall brood of beetles, which were ob- served Sep. 7, 1900, entering trees in large numbers. Aug. 1,1901, adults of Scolytus in some numbers were entering the bark of a young dying appletree, a victim of Saperda Ca
. Bulletin - New York State Museum. Science. 732 NEW YORK STATE MUSEUM observed in the vicinity of the trees, and it was probably this species which preyed on the bark beetles. This is a striking- illustration of the value of woodpeck- 0tf^f4-:-<-Mjf^^^^ ers and their perseverance in Jigging \)Jvi//f$$wtl$KUSK out such small insects. These pupae were undoubtedly the progeny of the fall brood of beetles, which were ob- served Sep. 7, 1900, entering trees in large numbers. Aug. 1,1901, adults of Scolytus in some numbers were entering the bark of a young dying appletree, a victim of Saperda Candida, at Pittstown N. Y. The bark beetles gnawed many minute holes about y^- of an inch deep and of the same diameter. Some of these holes were deserted, and in other places the beetles were at work mat Fig. 7 Work of fruit tree bark , , , . ' . beetle in pium (original) mg the primary entrance or beginning a gallery. This observation in connection with the preced- ing ones shows very clearly that the fall brood of beetles, if there be a distinct one, as is very probable, extends in the eastern part of New York state from Aug. 1 till Sep. 7 or later. This is still further confirmed by our finding at Ripley N. Y. Sep. 5, 1901, beetles entering plumtrees in large numbers. The presence of pupae and recently transformed beetles in the plumtrees examined May 22 would indicate that the adults would probably have emerged within a short time. There are therefore at least two generations annually in New York state, and the short period necessary for the completion of the life cycle permits more. It may be that more do occur, but there does not appear to be any good evidence to that effect, at pres- ent. Another cheering feature in the last mentioned attack was the breeding of numbers of the beneficial parasite known as Chiropachys colon Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appe
Size: 1123px × 2224px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectscience, bookyear1887
