Weeds of National Significance WILLOW SAWFLY Supported by the State Government of Victoria.

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Presentation transcript:

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?

Willow Sawfly - What Is It? Egg  Larva  Pupa  Adult    

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

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? 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? Several generations per season Several defoliation events per season Trees die! > 4 defoliations per season over two seasons defoliations per season may kill some trees Implications for willow and riparian management

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 Do? Assessment sheets Report sightings and information Collate and analyse

Willow Sawfly - The Long Term... May seriously affect willow management OR May have only minor impact

Further information & questions Willow Sawfly in Victoria Report, July