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- W2149271803 abstract "Abstract Physiological studies of Pinus radiata damaged artificially and of others attacked by Sirex noctilio F. indicated that temporary disturbances of the normal physiology of the host trees produce potential breeding sites for the woodwasp. Different physiological processes within trees were monitored after treatment and attack; these included changes in trans-location, transpiration, phloem respiration and osmotic and moisture content. The response of the S. noctilio to trees baited with phloem extracts or monoterpene solutions was investigated. The results of these studies, together with the published findings of other workers on the effects of insect secretions on trees and the resistance phenomenon, were interpreted into a general hypothesis of the interaction of the insect with the host tree. It was found that damage impaired translocation and enhanced transpiration and phloem respiration. These changes resulted in changes in tissue permeability and increased the rates of monoterpene and water vapour loss through the bark. The attraction of S. noctilio to trees was related to these changes, and the lowered osmotic status of the phloem favoured egg deposition. Drilling also was accompanied by the secretion of arthrospores of the symbiotic fungus Amylostereum areolatum and mucus, which inhibited translocation. High water tensions in stressed trees favoured fungus invasion, and low turgor resulting from the permeability changes minimised resinosis at oviposition sites. Successful establishment of the fungus, together with the effects of the mucus, resulted in tree death and the creation of a suitable milieu for Sirex development. The hypothesis proposes that the outcome of any attack is related to the duration and effects of the initial stressor on the tree and the tree's ability to moderate these effects. The response in the physiology of individual trees to stress affects the probability of attack while the resultant interaction between insect and tree determines the intensity of drilling, arthrospore and mucus load, and tree susceptibility or resistance to that attack." @default.
- W2149271803 created "2016-06-24" @default.
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- W2149271803 date "1977-09-01" @default.
- W2149271803 modified "2023-10-10" @default.
- W2149271803 title "Physiological reactions of<i>Pinus radiata</i>to attack by woodwasp,<i>Sirex noctilio</i>F. (Hymenoptera: Siricidae)" @default.
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- W2149271803 doi "https://doi.org/10.1017/s0007485300011214" @default.
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