Susceptibility of Eucalyptus globulus ssp. globulus to sawfly (Perga affinis ssp. insularis) attack and its potential impact on plantation productivity
Jordan, GJ and Potts, BM and Clarke, AR (2002) Susceptibility of Eucalyptus globulus ssp. globulus to sawfly (Perga affinis ssp. insularis) attack and its potential impact on plantation productivity. Forest Ecology and Management, 160 (1-3). pp. 189-199.
Official URL: http://dx.doi.org/10.1016/S0378-1127(01)00445-5
Sawflies (Perga species) are leaf-damaging pests of the major plantation tree species Eucalyptus globulus ssp. globulus. This work describes the patterns of quantitative genetic variation in susceptibility to attack by Perga affinis ssp. insularis, based on data from a large open-pollinated trial containing genetic material from throughout the geographic range of E. globulus ssp. globulus. Forty three percent of the trees in the trial exhibited damage from sawflies in either their sixth or seventh growth seasons. The incidence of damage was genetically based, with significant variation between geographic races of E. globulus ssp. globulus and highly heritable (h2 = 0.43 +/- 0.05) variation in damage incidence within races was observed. Susceptibility to sawfly damage significantly affects plant fitness with both genetic and environmental correlations demonstrating that that sawfly damage causes slow growth and increased mortality of trees. Mild and severe sawfly damage resulted in 16 % and 31 % reduction in the basal area of surviving trees, and the effect was consistent across races and families. Based on this data, we propose a model predicting relative plantation productivity of races of different susceptibility under different infestation regimes.
|Additional Information:||BM Potts. The definitive version is available online at http://www.sciencedirect.com/|
|Keywords:||insect damage, pulpwood, quantitative genetics, heritability, genetic correlation, fitness|
|Deposited By:||Dr Gregory J Jordan|
|Deposited On:||03 Sep 2007|
|Last Modified:||11 Sep 2008 13:24|
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