Distribution and host range of the recently introduced willow sawfly, Nematus ollgospilus Forster, on willows (Salve spp.) in south-east Australia

摘要

A survey of pathogens and invertebrate fauna of willows (Salix L. spp., Salicaceae) was undertaken in south-east Australia. Rapid sampling techniques were employed to gather presence /absence data on the organisms inhabiting willows. The willow sawfly, Nematus oligospilus Forster, is far more widespread than was previously thought and new occurrences were recorded for the Australian Capital Territory, New South Wales, Victoria and South Australia, as well as being detected in Tasmania for the first time. Willow species predominantly affected by sawfly included S.fragilis L. (crack willow), S. babylonica L., S. x sepucralis Simonk. var. sepucralis Simonk. and S. x sepucralis Simonk, (Dode) Meikle var. chrysocoma (Dode) Meikle (weeping willows) andS. alba L. var. vitellina (L.) Stokes (golden willow). It was also been found on S. matsudana Koidz. 'Tortuosa' (tortured willow), S. humboldtiana Willd. 'Pyramidalis' (pencil willow) and S. cinerea L. (pussy willow). Occurrences on the S. cinerea are the first records of sawfly on these species in the Southern Hemisphere.