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time (Fig. 3d). By contrast, insect herbivores causing moderate or low damage generally increased in species richness to a constant level over time (Figs. 3a–d). The total number of insect herbivore taxa recorded on E. globulus/nitens trees in Tasmania increased steadily from 1970 to 1992, with a trough until the next higher peak in 2005 (Fig. 3e). This includes all insect herbivores, not just those causing damage, and includes new records of many that are colonising E. nitens from their natural host, E. globulus (Lynne Forster pers. comm.). (a) Green Triangle Number of insect herbivore taxa 60 50 40 30 20 10 low moderate locally severe severe total severe 0 2001 2002 2003 2004 2005 2006 2007 2008 2009 (b) South-west WA Number of insect herbivore taxa 90 80 70 60 50 40 30 20 10 low moderate locally severe severe total severe 0 1992 1994 1996 1998 2000 2002 2004 2006 2008 2010 CRC for Forestry Technical Report 216: November 2011 Are insect herbivores in eucalypt plantations a worsening problem? 8
(c) Esperance, WA Number of insect herbivore taxa 27 24 21 18 15 12 9 6 3 0 2003 2005 2007 2009 (d) Tasmania Number of insect herbivore taxa 9 8 7 6 5 4 3 2 1 0 low moderate locally severe severe total severe low moderate locally severe severe total severe 1991 1993 1995 1997 1999 2001 2003 2005 2007 2009 CRC for Forestry Technical Report 216: November 2011 Are insect herbivores in eucalypt plantations a worsening problem? 9
Page 1 and 2: CRC for Forestry Researching sustai
Page 3 and 4: Acknowledgements We thank David de
Page 5 and 6: Contents Acknowledgements .........
Page 7 and 8: Executive summary The total area of
Page 9 and 10: Introduction Over the last few deca
Page 11 and 12: Databases Methods The annual Pest,
Page 13 and 14: a set of tables roughly correspondi
Page 15: Table 2. Correlation coefficients f
Page 19 and 20: (a) Green Triangle Severity index (
Page 21 and 22: For WA, Abbott (1993a) and Strauss
Page 23 and 24: 3 Have new insect herbivore species
Page 25 and 26: Discussion In general, there was su
Page 27 and 28: insect herbivores have been acciden
Page 29 and 30: Findings from this report are consi
Page 31 and 32: Future trends So what trends might
Page 33 and 34: Conclusions In this historical anal
Page 35 and 36: References Abbott, I. (1993a) Insec
Page 37 and 38: Jones, R.E. (2001) Mechanisms for l
Page 39 and 40: Paine, T.D., Steinbauer, M.J. & Law
Page 41 and 42: Appendices Changes in damage caused
Page 43 and 44: 2010 Wattle Range Dorodong Poolaije
Page 45 and 46: 2009-10 Wattle Range Dorodong Poola
Page 47 and 48: d) Autumn gum moth (Mnesampela priv
Page 49 and 50: e) Spitfire sawfly (Perga affinis)
Page 51 and 52: 2. South-west WA a) Yellow-belly ch
Page 53 and 54: ) Eucalyptus weevil (Gonipterus pla
Page 55 and 56: 2000 Boddinton Harvey Collie Bussel
Page 59 and 60: 1997 1998 Harvey Collie Busselton D
Page 63 and 64: d) Autumn gum moth (Mnesampela priv
Page 67 and 68:
2007 Boddinton Harvey Collie Bussel
Page 69 and 70:
1994 1995 1996 1997 Collie Busselto
Page 71 and 72:
Page 73 and 74:
Page 75 and 76:
) Eucalyptus weevil (Gonipterus sp.
Page 77:
d) Autumn gum moth (Mnesampela priv
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