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Boeremia exigua (Desm.) Aveskamp, Gruyter & Verkley 2010

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Boeremia exigua (Desm.) Aveskamp, Gruyter & Verkley 2010
Boeremia exigua (Desm.) Aveskamp, Gruyter & Verkley 2010

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Exotic
Present
New Zealand
Political Region

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Aveskamp, Gruyter & Verkley
Desm.
(Desm.) Aveskamp, Gruyter & Verkley
2010
37
ICNP
species
Boeremia exigua

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exigua

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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.
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.
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.

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Boeremia exigua (Desm.) Aveskamp, Gruyter & Verkley 2010
[Not available]

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7ae45cb1-3da2-4652-b557-1362fbbeb1a8
scientific name
Names_Fungi
2 September 2010
9 September 2010
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