Polymyxa graminis

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Polymyxa graminis spores in the epidermis of a wheat root (click on image to enlarge it)
Author(s): H.J. Larsen
Source: IPM Images
Polymyxa graminis resting spores (click on image to enlarge it)
Author(s): Arne Schwelm et al.
Source: Molecular Plant Pathology (2018) 19, p. 1033

Polymyxa graminis Ledingham

This species of slime molds is an obligate parasite of the roots of cereals and grasses. Infections are asymptomatic, but it is an important vector of various virus diseases of cereals, like Barley yellow mosaic virus or Peanut clump virus.