Puccinia helianthi

Sunflower rust (Puccinia helianthi ) on the underside of leaves of a sunflower

The sunflower rust (Puccinia helianthi ) is a Ständerpilzart from the order of rust fungi ( Pucciniales ). The fungus is an endoparasite of Korbblütlergattungen Helianthus, Iva and Heliopsis. Symptoms of infestation by the way are rust spots and pustules on the leaf surfaces of host plants. It is distributed worldwide.

Features

Macroscopic characteristics

Puccinia helianthi is with the naked eye can be seen only on the basis of the projected on the surface of the host spore deposits. They grow in clusters that appear as yellowish to brown spots and pustules on the leaf surfaces.

Microscopic characteristics

The mycelium of Puccinia helianthi growing intercellular like all Puccinia species and forms Saugfäden which grow in the tissue of the host memory. Your spermogonia grow predominantly on the upper side on the host leaves. The leaf underside growing Aecien the type kurzzylindrisch and stand in groups. 20-25 × 16-21 microns They have large, spherical to ellipsoidal, colorless Aeciosporen with warty surface. Most leaf underside of the mushroom growing uredia are cinnamon brown. Your also zimtbraunen uredospores are 26-33 × 18-22 microns in size, ovate to langellipsoid and stachelwarzig. The on both or predominantly leaf underside growing Telien the type are black brown, compact and early uncovered. The golden to light chestnut brown teliospores are two-celled, usually long ovate to langellipsoid and 38-60 × 21-30 microns in size. Your handle is colorless and up to 170 microns long.

Dissemination

The known distribution area of Puccinia helianthi covers the entire world.

Ecology

The host plants of Puccinia helianthi are different Helianthus, Iva and Heliopsis species. The fungus feeds on the present in storage tissues of the plant nutrients, its spores bearing later break through the leaf surface and set free spores. The way passes through a macrocyclic development cycle with spermogonia, Aecien, Telien and uredia, but takes no host change ( autoecious ).