Utilizing existing natural enemies to enhance the control of Emex australis in south-west Australia

Paul B. Yeoh and John K. Scott, CSIRO Division of Entomology, CRC for Weed Management Systems, Private Bag PO, Wembley, Western Australia 6014, Australia.


The natural enemy complex on Emex australis in Australia includes the stem blight fungus, Phomopsis emicis, the dock sawfly, Lophyrotoma analis and the dock aphid, Brachycaudus rumexicolens. The latter species is suitable for incorporation into a weed management system that includes strategies to augment or conserve the natural enemies on the weed. A system of providing alternative hosts for the aphid so as to increase its impact on the weed is proposed.


Plant Protection Quarterly (1996) 11 (4) 162-164.