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Weeds of National Significance. WILLOW SAWFLY. Supported by the State Government of Victoria . Willow Sawfly - What Is It?. Nematus oligospilus Insect, native to Northern Hemisphere Arrived here from NZ probably First reported in 2004, in Canberra. Willow Sawfly - Where Is It?.

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Weeds of National Significance

WILLOW SAWFLY

Supported by the State Government of Victoria.

willow sawfly what is it
Willow Sawfly - What Is It?
  • Nematus oligospilus
  • Insect, native to Northern Hemisphere
  • Arrived here from NZ probably
  • First reported in 2004, in Canberra
willow sawfly what is it4
Willow Sawfly - What Is It?
  • Egg  Larva  Pupa  Adult

willow sawfly what does it do
Willow Sawfly - What Does It Do?
  • Larvae eat willow leaves
  • Only willows, not native species
  • Can eat 2 leaves in a life cycle
  • Only mid-rib remains
  • Large populations can defoliate entire trees
willow sawfly what does it do6
Willow Sawfly - What Does It Do?

Before (Nov 05) and after (Mar 06): S. matsudana, near Canberra

willow sawfly what does it do7
Willow Sawfly - What Does It Do?
  • Life cycle in 4 weeks in good conditions
  • Seems to like warm, dry spring
  • Not sure about hot summers?
which willows
Which willows?
  • Tree willows more susceptible than shrub willows:
  • Crack
  • Black
  • Peking (S. matsudana)
  • Golden
  • Weeping (2nd preference)
  • Purple osier
  • Not grey sallow (S. cinerea)
willow sawfly why does it matter
Willow Sawfly - Why Does It Matter?
  • Several generations per season
  • Several defoliation events per season
  • Trees die!
  • > 4 defoliations per season over two seasons
  • 2 - 4 defoliations per season may kill some trees
  • Implications for willow and riparian management
willow sawfly what can we do
Willow Sawfly - What Can We Do?
  • Not possible to eradicate willow sawfly
  • May be able to protect individual trees, but insecticide use in riparian areas a problem
  • Project in Victoria with Melbourne Water, DSE, CMAs and PV
  • Monitoring willow sawfly and willows
  • Understanding impacts on willows
  • And on riparian vegetation
  • Data collection
willow sawfly what can we do11
Willow Sawfly - What Can We Do?
  • Assessment sheets
  • Report sightings and information
  • Collate and analyse
willow sawfly the long term
Willow Sawfly - The Long Term...
  • May seriously affect willow management

OR

  • May have only minor impact
further information questions
Further information & questions
  • Willow Sawfly in Victoria Report, July 2006
  • www.weeds.org.au/wons/willows