Association of Sphaeropsis sapinea with insect infestation following hail damage of Pinus radiata

Following a hail storm in the southern Cape province of South Africa, about 2000 ha of Pinus radiata plantations suffered die-back associated with Sphaeropsis sapinea. A series of sample plots in these plantations yielded information on the association of trees infected by S. sapinea with colonisati...

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Bibliographic Details
Published in:Forest ecology and management 1995-04, Vol.72 (2), p.293-298
Main Authors: Zwolinski, J.B., Swart, W.J., Wingfield, M.J.
Format: Article
Language:English
Subjects:
Biological and medical sciences
Coleoptera
DAMAGE
DANOS
DEGAT
Fundamental and applied biological sciences. Psychology
Generalities. Disease free stocks
GRANIZO
GRELE
HAIL
Hail damage
Insect infestation
Phytopathology. Animal pests. Plant and forest protection
PINUS RADIATA
PISSODES
SCOLYTIDAE
SPHAEROPSIS
Sphaeropsis sapinea
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Summary:Following a hail storm in the southern Cape province of South Africa, about 2000 ha of Pinus radiata plantations suffered die-back associated with Sphaeropsis sapinea. A series of sample plots in these plantations yielded information on the association of trees infected by S. sapinea with colonisation of tissue by two species of cambiophagous insect pests. The infestation of diseased trees, first by Pissodes nemorensis and then by Orthotomicus erosus, mostly coincided with the zone of tissue discolouration associated with S. sapinea. Pissodes nemorensis proved to be more common than O. erosus and demonstrated the ability to infest healthy tissue adjacent to discoloured areas colonised by S. sapinea. It therefore displayed the potential to facilitate the further colonisation of healthy cambial tissue by S. sapinea and thus exacerbate die-back of trees.
ISSN:0378-1127
1872-7042
DOI:10.1016/0378-1127(94)03459-A