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Phoma exigua Desm. 1849
Details
Phoma exigua Desm., Ann. Sci. Nat., Bot., 3e Sér. 11 282 (1849)
Nomenclature
Desm.
Desm.
1849
282
ICN
Phoma exigua Desm. 1849
species
Phoma exigua
Classification
Subordinates
Associations
has host
has host
Descriptions
Phoma exigua Desm. 1849
In winter glasshouse crops of tomatoes in the Auckland area it can be of importance. It occurs as a wound pathogen on stem injuries due to "lateraling". It may also cause a fruit rot of outdoor grown tomatoes. It occurs on tubers and haulms of potatoes but is only of minor importance.
Phoma exigua Desm. 1849
Type: Foliicolous Fungi; Description: Conidiomata pycnidial, solitary or in scattered groups, subepidermal becoming erumpent, globose, brown, 0.2–0.3 mm in diameter, ostiolate; on leaf spots and on necrotic tissue of other plant parts. Conidia ellipsoid to cylindrical, straight or slightly curved, 0-septate, becoming 1-septate, 5–10 × 2–4 μm, smooth, often bi-guttulate, hyaline.
Distribution: Northland, Auckland, Bay of Plenty, Wanganui, Wellington, Gisborne, Hawkes Bay, Nelson, Buller, Kaikoura, Mid Canterbury.; 1st Record: Hamilton (1947: as Ascochyta sp.).
Significance: The cause of a leaf spot of minor importance in poplar (Spiers 1976). It is of some significance as a wound pathogen and as a storage rot organism in horticultural crops (Dingley 1969).; Host(s): Actinidia chinensis, A. deliciosa, Casimiroa edulis, Cyphomandra betacea, Eucalyptus erythrocorys, Garrya elliptica, Hedera helix, Hibiscus rosa-sinensis, Humulus lupulus, Meryta sinclairii, Nephrolepis cordifolia, Nerium oleander, Populus alba, P. ×canadensis, P. deltoides, P. maximowiczii, P. nigra, Rosmarinus officinalis.
Phoma exigua Desm. 1849
REPRESENTATIVE CULTURES: PDDCC 6611, 6621.
COLONY MORPHOLOGY OA: Colonies 30-90 mm diam. after 7 days. Mycelium; cottony, dense, unevenly tufted, ragged, pale to dark grey or olivaceous. Large clumps of dark pycnidia may be scattered over the colony surface. Reverse; grey. ME: Colonies 30-90 mm. Mycelium; sparse, dark grey or olivaceous, with dark purple-black agar surface visible. Edge of colony deeply scalloped. Reverse; black with a narrow clear margin. Addition of a drop of 1N NaOH to the agar at the edge of the colony produces a green pigment which turns red after a few minutes: CHLAMYDOSPORES: None. CONIDIA: Variable in shape, oblong to elliptic or often irregular, in some isolates may often be 1-septate. (4.5-)6-8(-10) x 2-3 µm. PYCNIDIA: Solitary or in scattered large groups with adjacent pycnidia having confluent walls; dark walled.
OCCURRENCE: Common, plurivorous saprophyte or weak wound pathogen.
NOTE: The growth rate varies greatly between isolates, as does the intensity of the NaOH colour reaction.
Taxonomic concepts
Phoma exigua Desm. 1849
Phoma exigua Desm. (1849)
Phoma exigua Desm. 1849
Phoma exigua Desm. (1849)
Phoma exigua Desm. 1849
Phoma exigua Desm. (1849)
Global name resources
Collections
Metadata
1cb19975-36b9-11d5-9548-00d0592d548c
scientific name
Names_Fungi
2 September 2010