Sclerophthora macrospora (Saccardo) Thirumalachar, Shaw & Narasimhan, 1953

on grasses

Sclerophthora macrospora on Zea mays

Zea mays, USA © Paul Bachi, University of Kentucky Research and Education Center, Bugwood.org

gall

Affected plants remain small, the leaves are often somehwat fleshy, often they also are strongly contorted en yellowing. Especially the inflorescence is strongly malformed. In the dying tissue many, relatively large, pale yellow oospores are formed: resting spores with a thick, smooth wall. They can survive in the soil for several years. Under wet circumstances they germinate, each spore releasing a number of motile zoospores, that infect new plants.

hostplants

Poaceae, broadly oligophagous

Agrostis stolonifera; Alopecurus myosuroides, pratensis; Arrhenatherum elatius; Avena fatua, sativa; Bromopsis inermis; Bromus commutatus; Cynodon dactylon; Dactylis glomerata; ? Elymus caninus; Elytrigia repens; Eragrostis cilianensis; Festuca ovina; Glyceria; Holcus lanatus, mollis; Hordeum vulgare; Lolium perenne, temulentum; Phalaris canariensis; Phalaroides arundinacea; Phleum pratense; Phragmites australis; Poa pratensis; Puccinellia capillaris, maritima; Secale cereale; Triticum; Zea.

notes

In subtropical regions “Crazy Top”, or “Yellow Tuft” is an important pest. It is prevalent in places where seedling haven been growing, on waterlogged soil.

references

Brandenburger (1985a), Buhr (1965a), Jage, Klenke, Kruse ao (2016a), Jage, Kruse, Kummer ao (2013a), Jage, Klenke, Kruse ao (2017a), Klenke & Scholler (2015a), Müller & Kokeš (2008a).

mod 3.ix.2018