Erysiphales: Genera Causing Powdery Mildews

 

Phylum: Ascomycota

Class: Ascomycetes

Order: Erysiphales

Family: Erysiphaceae

Genus: Erysiphe

 

Characteristics

  • Mostly obligate parasite grow in host plants.
  • Two types of haustoria present that is knob like and digitately branched.
  • Both homothallic and heterothallic.
  • Asexual reproduction by conidiophore.
  • Sexual reproduction is followed by gametangial contact.
  • Ascocarp is cleistothecium.
  • Ascocarp contains various types of appendages.
  • Mycelia conspicuous, growing mostly on plant surfaces.
  • They are called powdery mildew fungi.

 

Occurrence and importance

The members of the family Eryspipahceae cause a group of plant diseases commonly known as powdery mildews.

Ornamental plants: Erysiphe poligoni.

 

Somatic structure

Hyphae: Pale brown or hyaline, Mycelia septate wall. Branched, colony white powdery.

 

Haustoria

 

Asexual reproduction

Mycelia fragments, oidiospore

 

 

Sexual reproduction

Cleistothecium with appendages.

 

Classification on the basis of cleistothecial appendages:

There are four kinds of appendages present in a cleistothecium.

  • Appendages flaccid, mycoloid type.
  • Appendages rigid, dichotomously branched at the tip of the apex.
  • Appendages rigid, tip circinately coiled and hook like appendages present at the tip of the apex.
  • Appendages rigid, spear like, arising from a bulbous base and tip pointed.

 

Life cycle of Shaerotheca.

About Abulais Shomrat

Abulais Shomrat
Currently in 4th year (Hons) in Department of Botany, University of Dhaka. Planning to have multiple careers one by one but promised to be with 'Plantlet' as long as it's primary stage remains unfinished.

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