Phytophthora asparagi

Name and publication

Phytophthora asparagi Saude & Hausbeck (2012)

Granke LL, Saude C, Windstam ST, Webster BJ, and Hausbeck MK. 2012. Phytophthora asparagi Saude & Hausbeck, sp. nov. Persoonia 28: 146–147. In Crous et al. Fungal Planet description sheets: 107–127. Persoonia 28: 138–182

Nomenclature

Mycobank

MB569000

Etymology

named after the host from which it was isolated, Asparagus

Typification

Type: USA, Southwest Michigan, Asparagus officinalis, Spring 2006, C. Saude & M.K. Hausbeck, holotype CUP SP326 (Cornell herbarium)

Ex-type: SP326 = CBS 132095

Sequences for ex-type in original manuscript:  ITS EF185089, LSU JX064983

Ex-type in other collections

ATCC MYA-4826

Molecular identification

Sequences for ex-type in other sources

NCBI: Phytophthora asparagi CBS 132095

Position in ITS phylogenetic tree

Clade 6d

Morphological identification

Colonies and cardinal temperatures

Colony morphology appressed with stellate to rosaceous pattern on V8A. Minimum growth temperature 5°C, optimum 25°C, and maximum 30°C.

Conditions for growth and sporulation

Sporangia produced on dilute V8 agar. Oogonia are formed readily on V8A.

Asexual phase

Sporangia non-papillate, non-caducous, and predominantly ovoid to obpryiform in shape. Sporangia ranged 20–60 x 10–35 µm;. Sporangiophores simple or loose sympodia. Hyphal swellings present. Chlamydospores absent.

Sexual phase

Homothallic. Oogonia smooth-walled. Oospores plerotic, thick-walled, size ranged 25 – 45 µm. Antheridia amphigynous.

Most typical characters

Morphologically similar to other species in Clade 6.

Additional specimen(s) evaluated

USA, Southwest Michigan, Asparagus officinalis, 2004-2005, C. Saude & M.K. Hausbeck, 48 isolates (Saude et al. 2008)

Hosts and distribution

Distribution: USA, japan, China, Europe, Australia, New Zealand, South Africa
Substrate: crown, roots, and spear (Asparagus)
Disease note: water-soaked lesions on shoots slightly above or below the soil line (Asparagus)

Host: Asparagus (Asparagaceae), Pistacia lentiscus (Anacardiaceae), Juniperus phoenicea (Cupressaceae)

Additional references and links

none available

Fact sheet author

Treena Burgess, Ph.D., Phytophthora Science and Management, Harry Butler Institute, Murdoch University