Uromyces pencanus
| Uromyces pencanus | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Uromyces pencanus | ||||||||||||
| ( Dietel & Neger ) Arthur & Holway |
Uromyces pencanus is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of sweet grasses of the genus Stipa and the species Nassella chilensis . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common in southern South America .
features
Macroscopic features
Uromyces pencanus can only be recognized with the naked eye by means of the spore beds protruding on the surface of the host. They grow in nests that appear as yellowish to brown spots and pustules on the leaf surfaces.
Microscopic features
The mycelium of Uromyces pencanus grows as with all Uromyces TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. The cylindrical aecia of the species growing on the top of the leaves have hyaline or pale yellow aeciospores with a warty surface , 24–28 × 22–26 µm in size . The cinnamon-brown uredia of the fungus grow on the top of the host leaves. Their light cinnamon-brown uredospores are 26–30 × 23–27 µm in size, mostly broad ellipsoidal and spiky. The parts of the species growing on the top of the leaves are black-brown, powdery and uncovered early. The chestnut-brown teliospores are unicellular, usually ovoid to oval and 27–34 × 21–25 µm in size. Their stem is colorless to brownish and up to 70 µm long.
distribution
The known distribution area of Uromyces pencanus includes Chile and Argentina .
ecology
The host plants of Uromyces pencanus are for haplonts as for the dikaryotic Nassella chilensis and various feather grass ( Stipa spp.). The fungus feeds on the nutrients present in the storage tissue of the plants, its spore beds later break through the leaf surface and release spores. The species has a development cycle with spermogonia, Aecien, Telien and Uredien and completes a host change .
meaning
In New Zealand, Uromyces pencanus is being used on a trial basis for biological pest control against Nassella neesiana .
literature
- George Baker Cummins: The Rust Fungi of Cereals, Grasses and Bamboos . Springer, Berlin et al. 1971, ISBN 3-540-05336-0 .
Individual evidence
- ^ Richard Hill, Release of the rust fungus Uromyces pencanus As a biological control agent for the weed Chilean needlegrass. Environmental Risk Management Authority (ERMA) New Zealand. Online ( Memento of the original from December 26, 2015 in the Internet Archive ) Info: The archive link was automatically inserted and not yet checked. Please check the original and archive link according to the instructions and then remove this notice. (PDF; 71 kB)
- ↑ Freda E. Anderson, Jane Barton, David McLaren, 2010. Studies to assess the suitability of Uromyces pencanus as a biological control agent for Nassella neesiana (Poaceae) in Australia and New Zealand. Australasian Plant Pathology 39: 69-78. On-line
