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Grassy weeds in pastoral systems - CONTEXT, NEEDS AND DIRECTIONS

Grassy weeds in pastoral systems - CONTEXT, NEEDS AND DIRECTIONS. weeds are everywhere. pastoral systems are often weedy. perception is important. Weeds of pastoral systems. Weeds of significance to the grazing industries of Australia MLA and Weeds CRC 2002 .

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Grassy weeds in pastoral systems - CONTEXT, NEEDS AND DIRECTIONS

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  1. Grassy weeds in pastoral systems - CONTEXT, NEEDS AND DIRECTIONS • weeds are everywhere • pastoral systems are often weedy • perception is important

  2. Weeds of pastoral systems • Weeds of significance to the grazing industries of Australia • MLA and Weeds CRC 2002 • 119 weed species referenced • 48 species or groups of species of greatest significance • 9 grasses or groups of grasses: • African lovegrass • browntop bent grass • Chilean needle grass • Coolatai grass • grader grass • annual grasses – e.g. barley grass • perennial mission grass • rat’s tail grasses • serrated tussock

  3. Grassy weeds – where have they come from? INTRODUCED GRASSES DELIBERATE ACCIDENTAL AGRICULTURE ORNAMENTAL

  4. Grassy weeds – where have they come from? CSIRO Plant Introduction Service 1924-2000 crops 197 species other C3 grasses 1067 other C4 grasses 992 TOTAL 2250 No. of grass accessions introduced from Sub-Saharan Africa 3490 Asia 2052 N&E Europe 3786 Mediterranean 2934 North America 4559 Central America 298 South America 2000 Other/unknown 660 TOTAL 19779

  5. Some deliberately introduced weedy grasses Pennisetum – 5 species including P. polystachion (mission grass) Nassella – 9 species, including N. trichotoma and N. neesiana Andropogon virginicus Bromus spp. Eragrostis curvula (African lovegrass) Hyparrhenia hirta (Coolatai grass) Sporobolus indicus (rat’s tail grass) Themeda quadrivalvis (grader grass) Vulpia bromoides

  6. Weedy grasses and the Weeds CRC • Weeds CRC in its second round since 2001 • 3 research programs • Management of new incursions • Cropping systems • Landscape management • Landscape Management Program • Task 1: Habitat approach • Task 2: Functional group approach • Task 3: The science of biological control • Task 3 deals with four functional groups • (i) invasive rangeland shrubs • (ii) bird-dispersed weeds • (iii) aquatic weeds • (iv) unpalatable grasses

  7. Unpalatable grass weeds in context • Prominence • Impact • Threat • Intractability • Conflict

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