Puccinia malvacearum

Malvenrost (Puccinia malvacearum )

The Malvenrost (Puccinia malvacearum ) is a Ständerpilzart from the order of rust fungi ( Pucciniales ). The fungus is an endoparasite of Malvengewächses the tribe Malvae. 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

Malvenrost 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 Malvenrosts grows intercellular as with all Puccinia species and forms Saugfäden that grow in the storage tissues of the host. His Telien grow leaf upper side and are wide in about 200 microns. Spermogonia, Aecien and uredia not formed from the fungus. Most underside growing on the host leaves and sepals and young fruits Telien the type are brown, uncovered and cushion shaped. The bright yellow teliospores are one to dreizellig, short fusiform to short clavate and usually 35-63 × 17-24 microns in size. Your handle is colorless and up to 150 microns long.

Dissemination

The known distribution area of ​​Malvenrostes covers the whole world. It was originally limited to Chile, the species was later deported to other parts of the world.

Ecology

The host plants of Malvenrostes are different mallow, marshmallow and Malvastrum 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 type has a micro cyclical development cycle ( it forms only Telien off) and does not host change by.