Puccinia evadens
| Puccinia evadens | ||||||||||||
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Puccinia evadens on Baccharis pilularis |
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| Scientific name | ||||||||||||
| Puccinia evadens | ||||||||||||
| Harkness |
Puccinia evadens is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the daisy family Baccharis . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common in much of America.
features
Macroscopic features
Puccinia evadens can only be recognized with the naked eye by means of the spore beds emerging 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 Puccinia evadens grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Their spermogonia grow on stems. The aecia growing on stems of the species are pustular, stalky, light yellow and erupting. They have 36–55 × 23–25 µm in size, spindle-shaped, ellipsoidal to ellipsoidal, hyaline to light yellowish aeciospores with a warty surface. The uredia of the mushroom growing on both sides are light yellow to cinnamon brown. Their colorless to pale yellow uredospores are 30–38 × 22–27 µm in size, ovate to ellipsoidal and spiky. The leaves of the species growing on the underside of the leaves and on stems and twigs are dark cinnamon brown, powdery and uncovered. The golden-brown teliospores are two-celled, usually long ellipsoid and 54–74 × 26–30 µm in size. Their stem is colorless and up to 160 µm long.
distribution
The known distribution area of Puccinia evadens extends from South America to the southwest USA .
ecology
The host plants of Puccinia evadens are various Baccharis species. 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 goes through a development cycle with Spermogonia, Aecien, Telien and Uredien.
meaning
Puccinia evadens is also used for biological pest control against Baccharis halimifolia in Australia.
Systematics
Puccinia evadens was first described by Harkness in 1884. It is partly considered to be conspecific with Puccinia baccharidis .
literature
- George Baker Cummins : The Rust Fungi of Cereals, Grasses and Bamboos . Springer, Berlin 1971, ISBN 3-540-05336-0 .
Individual evidence
- ↑ Jim Cullen, Mic Julien, Rachel McFadyen: Biological Control of Weeds in Australia. Csiro Publishing, 2012, pp. 91f.
- ↑ R. Charudattan, U. Verma, JT Devalerio, AJ Tomley: pathogen attacking groundsel bush, "Baccharis halimifolia" in Florida. In: Biological control of weeds. 1996, pp. 437-444. ( online ; PDF; 1.0 MB)
