Environmental Entomology (1985) 14, 396-400

Stephen P. Cook and Fred P. Hain (1985)
Qualitative examination of the hypersensitive response of loblolly pine, Pinus taeda L., inoculated with two fungal associates of the southern pine beetle, Dendroctonus frontalis Zimmermann (Coleoptera: Scolytidae)
Environmental Entomology 14 (4), 396-400
Abstract: Loblolly pine, Pinus taeda L., responded to wounding and wounding plus inoculation with two fungal associates of the southern pine beetle (SPB), Dendroctonus frontalis Zimmermann by forming a hypersensitive reaction zone around the wound sites. There was a significant difference in the length of the reaction produced depending upon treatments. A simple mechanical wound produced a shorter lesion than a wound accompanied by inoculation with Ceratocystis minor (Hedgecock) Hunt var. barrassi Taylor which produced a shorter lesion than a wound accompanied by a C. minor inoculation. There was a significant change in monoterpene composition and a significant decrease in soluble sugars present in the hypersensitive reaction zones compared with unwounded phloem, but there were no differences in these parameters between the reaction zones resulting from the two fungal inocula. The overall response of the trees to invasion by SPB fungal associates was a compositional change in potential toxins (monoterpenes) accompanied by a decrease in potential nutrients (soluble sugars) in the area directly surrounding the wound site. Also, the more virulent invader appeared to evoke a stronger response (lesion length) by the trees.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Stephen Cook

Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host

---

Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Dendroctonus frontalis	Pine (Pinus)	U.S.A. (SE)
	Ophiostoma minus	Pine (Pinus)	U.S.A. (SE)