Uromyces viciae-fabae var. viciae-fabae

Uromyces viciae - fabae

Uromyces viciae - fabae is a Ständerpilzart from the order of rust fungi ( Pucciniales ). The fungus is an endoparasite of Hülsenfrüchtlergattungen Vicia, Lathyrus and Pisum. Symptoms of infestation by the way are rust spots and pustules on the leaf surfaces of host plants. It is distributed worldwide. Significantly, the attack on faba bean.

Features

Macroscopic characteristics

Uromyces viciae - fabae 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 Uromyces fabae viciae - growing intercellular like all Uromyces species and forms Saugfäden growing in the storage tissue of the host. Your spermogonia usually grow under other in small groups on the host leaves. The also growing mostly leaf underside and petioles Aecien the type are whitish and cup-shaped. Your Aeciosporen are 18-26 × 15-21 microns in size, breitellipsoid and warty. The expanding mutual uredia of the fungus are yellowish brown. The bright golden uredospores are 24-29 × 19-22 microns in size, and breitellipsoid stachelwarzig. The growing on both sides and on stems Telien the type are black brown, compact and uncovered. The Maroon teliospores are single-celled, usually ovate to oval, smooth and mostly 27-35 × 19-23 microns in size. Your handle is colorless and up to 60 microns long.

Dissemination

The known distribution area of Uromyces viciae - fabae covers the whole world.

Ecology

The host plants of Uromyces viciae - fabae are different Vicia, Pisum and Lathyrus species. The fungus feeds on the present in storage tissues of the plant nutrients, its spores bearing later break through the leaf surface, and put spores free. The way passes through a macrocyclic development cycle with spermogonia, Aecien, Telien and uredia. As autoöker parasite makes them by any change of host.

Importance

Uromyces viciae - fabae is a serious pest of faba bean. A tillage reduced the infestation, since the fungus hibernates in infested plant parts. Approved is a chemical control with Folicur and pyrethroid insecticides.