Anatomical Response and Recovery of Twigs of Juglans Nigra Following Oviposition Injury Inflicted by The Two-Spotted Treehopper, Enchenopa Biontata

Authors

  • J. E. Armstrong
  • W. H. Kearby
  • E. A. McGinnes, Jr

Keywords:

Juglans nigra, wound repair, compartmentalization, periderm formation, anatomy

Abstract

Ovipositor wounds on one-, two-, and three-year-old twigs of black walnut were examined. The ireehopper's ovipositor makes a longitudinal wound, which curves tangenlially through the bark splitting the tissues along the cambial zone of first year twigs. Following oviposition in August to early October, there is some proliferation of wound periderm and callus tissue surrounding the wound. Following nymph emergence in May. extensive callus formation and cambial activity closes the wound and reestablishes the continuity of the vascular cambium. Third-year growth produces normal secondary xylem: externally a corky scar remains.

References

Gray, P., and F. M. Pickle. 1956. Iron-mordanted safranin and celestine blue for staining skeletalelements in plant sections. Phytomorphology 6:196-198.nMcginnes, Jr., E. A., J. E. Phelps, P. S. Szopa, and A. L. Shigo. 1977. Wood anatomy aftertree injury—a pictorial study. Res. Bull. 1025. Univ. of Missouri College of Agriculture. 35 pp.nMullick, B. 1977. The nonspecific nature of defense in bark and wood during wounding, insect and pathogen attack. Pages 395-441 in: F. A. Loewus and V. C. Runeckles, eds. Recent advances in phytochemistry. vol. II. Plenum Publishing Corp., New York.nSchmid, R. 1976. The elusive cambium-another terminological contribution. IAWA Bulletin. 1976(4):51 59.nShigo, A. L. 1969. The death and decay of trees. Natural History 78(3):43-47.nWood, T. K., and R. L. Patton. 1971. Egg froth distribution and deposition by Enchenopa binotata (Homoptera: Membradidae). Ann. Ent. Soc. Amer. 64(5):1190-1191.n

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Published

2007-06-28

Issue

Number 1 / Spring 1979

Section

Research Contributions

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