. Economic entomology for the farmer and fruit-grower . '-gall maker.—a, gall just beginning to form over recent borings ; b, section through an old stem to show the character of the gall. shoots causes the death of the young larvae, which are unable to subsist on dead wood, and being footless are unable to migrate to new stalks. Another species of Agrilus seriously injurious in parts of the Eastern United States is the "sinuate pear-borer," A. sinuatus, imported from Europe within recent years. This feeds between bark and wood in pear-trees, making immensely long zig-zag galleries,
. Economic entomology for the farmer and fruit-grower . '-gall maker.—a, gall just beginning to form over recent borings ; b, section through an old stem to show the character of the gall. shoots causes the death of the young larvae, which are unable to subsist on dead wood, and being footless are unable to migrate to new stalks. Another species of Agrilus seriously injurious in parts of the Eastern United States is the "sinuate pear-borer," A. sinuatus, imported from Europe within recent years. This feeds between bark and wood in pear-trees, making immensely long zig-zag galleries, finally girdling the tree and killing it. It lives two years in the larval stage. In general we are very helpless against boring larvae once they get into the trunk of a tree. Cutting out is a tedious process, even if the location of the larva is easily discoverable, which it often is not. We must, therefore, try to prevent their entrance,
Size: 2317px × 2157px
Photo credit: © The Bookworm Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectbenefic, bookyear1906
