Download Copy a link to this page Cite this record

Click to collapse Details Info

Rhizoctonia solani J.G. Kühn 1858
Rhizoctonia solani J.G. Kühn 1858

Click to collapse Biostatus Info

Uncertain
Present
New Zealand
Political Region
Rhizoctonia solani is present in NZ, but has many anastomosis groups (AG) which are genetically distinct and likely represent different species [BSW, 30 Sep 2022]

Click to collapse Nomenclature Info

J.G. Kühn
J.G. Kühn
1858
224
ICN
Rhizoctonia solani J.G. Kühn 1858
species
Rhizoctonia solani

Click to collapse Classification Info

Click to collapse Associations Info

Click to collapse Descriptions Info

PAPILIONACEAE. Vinca major: Wellington, Upper Hutt, 20 m. SOLANACEAE. Solanum tuberosum: Auckland, Mt. Albert, 100 m.
Hymenophore annual, effused, readily lifting, spreading over stems of living plants, arachnoid-mucedinioid, forming irregular linear areas to 15 cm long, 2-10 mm wide; hymenial surface white, drying cream or greyish, irregularly slightly tufted; margin thinning out, concolorous, arachnoid. Context white, of a few repent hyphae 8-10 µm diameter, commonly 7-8 µm, walls 0.5 µm thick, without clamp connections; fertile hyphae erect, cymose, ends of branchlets bearing clusters of basidia and paraphyses. Basidia subclavate, some cylindrical, 12-18 x 8-10 µm, bearing 3-4 spores on sterigmata which may attain a length of 15 µm. Paraphyses subclavate, 6-10 x 6-8 µm. Spores elliptical or oblong, some obovate, apiculate, 7-11 x 5-6.5 µm, walls smooth, hyaline, 0.5 µm thick.
DISTRIBUTION: Probably cosmopolitan.
HABITAT: Effused on stems and leaves of living plants.
Recognised by the elliptical spores borne on sterigmata which, at first stout and short, elongate shortly before spores are formed to reach a length of 15 µm. Not infrequently one sterigma is suppressed, basidia then bearing three spores. Although the Pellicularia stage is comparatively rare, the hyphal stage of the species is a well known parasite of many plants. On potato tubers the fungus forms black sclerotia, this stage being long known under the name of Rhizoctonia solani. In a previous paper (Cunningham 1953, c, p. 328) Corticium praticola was listed as a synonym. Flentje has shown that this species, to which he gave the name Pellicularia praticola (Kotila) Flentje (1956, p. 353) may be separated by cultural characters and several minor morphological features.
TYPE LOCALITY: Ecuador, South America.

Rhizoctonia solani J.G. Kühn 1858

Sequence analysis of the rDNA-ITS regions from these isolates identified three Anastomosis Groups (AGs), AG-3PT, AG-2-1 and AG-5. Isolates classified as AG-3PT were widely distributed, whereas AG-2-1 and AG-5 were confined to distinct locations. Sequence heterogeneity was identified in the ITS regions of 100 AG-3PT and AG-2-1 isolates. Variation in the sequence and length of the rDNA-IGS1 region was also observed for selected isolates of AG-3PT and AG-2-1 isolates. Phylogenetic studies found all AG-2-1 isolates belong to AG-2Nt, a subset of AG-2-1 previously associated with solanaceous crops in other countries. AG-2-1 isolates were consistently more aggressive than those of AG-3PT. Delayed emergence, severe infection on stolons, formation of aerial tubers and considerable yield losses were associated with AG-2-1, but they caused negligible black scurf. In contrast, AG-3PT caused black scurf on progeny tubers but variable effects on stem emergence and stolons. Furthermore, AG-2-1 isolates caused severe tuber malformation, but isolates of other AGs did not
Pellicularia filamentosa is an important fungus in potato crops. Chamberlain (1931) suggested for its control treatment of seed with acidified mercuric chloride dip some months before planting. In recent years Booth (1965) recommended a dip in mercury-based compounds as a pre-planting treatment for seed potatoes; he emphasised that dipping should be done before the tubers have sprouted. It is associated with brown patch on lawns and greens (Brier, 1935; and Arnold and Brier 1961). In pastures in wet humid weather it may rot areas of grass. Ward (1926) noted that Rhizoctonia could be a problem in Lucerne pastures on areas with high rainfall. Wratt (1956) and Blair and Morrison (1949) showed its importance as a pre-emergence rot in seedlings of cereals. It is also important in nursery beds of seedlings of forestry trees such as Pinus radiata, P. nigra, and Pseudotsuga menziesii (Thulin, Will, and Bassett 1958). It is common in warm dry weather in seed beds of crops such as lettuce, tomatoes, and cabbage. It was also noted in nursery beds of citrus and peach seedlings and can be of considerable economic importance in nursery seed beds, especially in humid periods in summer months. Except for Agathis australis and Hydrocotyle sp., all hosts are introduced.

Rhizoctonia solani J.G. Kühn 1858

Type: Radicicolous Fungi; Description: Colonies on agar at first colourless, rapidly becoming brown, aerial mycelium sparse. Hyphae subhyaline to pale brown, often constricted near the septa, clamp connections none. Sclerotia irregular in shape, brown, solitary, about 1 mm in diameter, sometimes confluent and forming conspicuous crusts. Basidiomata rarely seen in nature, sometimes induced in culture by transfer from a rich to a poor nutrient medium when they are resupinate, effuse, creamy, loosely attached to the substratum. Basidiospores oblong to broadly ellipsoid, 6–14 × 4–8 μm, apiculate at the base, smooth, hyaline, non-amyloid.
Distribution: Northland, Auckland, Waikato, Bay of Plenty, Taranaki, Rangitikei, Wellington, Nelson, Mid Canterbury, South Canterbury, Dunedin, Southland.; 1st Record: Kirk (1908: as Rhizoctonia).
Significance: Found by Thulin et al. (1958) to be the main pathogen causing damping off in Larix decidua, Picea sitchensis, Pinus nigra subsp. laricio, P. radiata, and Pseudotsuga menziesii in a forest nursery. Bassett (1961) noted its association with damping off of young coniferous seedlings from three nurseries.; Host(s): Agathis australis, Citrus sinensis, Larix decidua, Picea sitchensis, Pinus nigra subsp. laricio, P. radiata, P. taeda, Prunus persica, Pseudotsuga menziesii.

Click to collapse Taxonomic concepts Info

Corticium vagum var. solani Burt (1903)
Rhizoctonia solani J.G. Kühn 1858
Rhizoctonia solani J.G. Kühn (1858)
Rhizoctonia solani J.G. Kühn 1858
Rhizoctonia solani J.G. Kühn (1858)
Rhizoctonia solani J.G. Kühn 1858
Rhizoctonia solani J.G. Kühn 1858
Rhizoctonia solani J.G. Kühn 1858
Rhizoctonia solani J.G. Kühn
Rhizoctonia solani J.G. Kühn 1858
Rhizoctonia solani J.G. Kühn (1858)
Rhizoctonia solani J.G. Kühn 1858
Rhizoctonia solani J.G. Kühn (1858)
Rhizoctonia solani J.G. Kühn 1858
Rhizoctonia solani J.G. Kühn (1858)
Rhizoctonia solani J.G. Kühn 1858
Rhizoctonia solani J.G. Kühn (1858)
Thanatephorus cucumeris (A.B. Frank) Donk (1956)
Thanatephorus cucumeris (A.B. Frank) Donk (1956)
Thanatephorus cucumeris (A.B. Frank) Donk (1956)
Thanatephorus cucumeris (A.B. Frank) Donk (1956)
Thanatephorus cucumeris (A.B. Frank) Donk (1956)
Thanatephorus cucumeris (A.B. Frank) Donk (1956)
Thanatephorus cucumeris (A.B. Frank) Donk (1956)
Thanatephorus cucumeris (A.B. Frank) Donk (1956)
Thanatephorus cucumeris (A.B. Frank) Donk (1956)
Thanatephorus cucumeris (A.B. Frank) Donk (1956)
Thanatephorus cucumeris (A.B. Frank) Donk 1956
Thanatephorus cucumeris (A.B. Frank) Donk (1956)

Click to collapse Collections Info

Rhizoctonia solani J.G. Kühn 1858
[Not available]
Rhizoctonia solani J.G. Kühn 1858
American Samoa
Rhizoctonia solani J.G. Kühn 1858
Australia
Rhizoctonia solani J.G. Kühn 1858
Fiji
Rhizoctonia solani J.G. Kühn 1858
Iran, Islamic Republic Of
Rhizoctonia solani J.G. Kühn 1858
Lao People's Democratic Republic
Rhizoctonia solani J.G. Kühn 1858
New Zealand
Rhizoctonia solani J.G. Kühn 1858
New Zealand
Auckland
Rhizoctonia solani J.G. Kühn 1858
New Zealand
Bay of Plenty
Rhizoctonia solani J.G. Kühn 1858
New Zealand
Central Otago
Rhizoctonia solani J.G. Kühn 1858
New Zealand
Dunedin
Rhizoctonia solani J.G. Kühn 1858
New Zealand
Mid Canterbury
Rhizoctonia solani J.G. Kühn 1858
New Zealand
Nelson
Rhizoctonia solani J.G. Kühn 1858
New Zealand
New Zealand
Rhizoctonia solani J.G. Kühn 1858
New Zealand
Otago Lakes
Rhizoctonia solani J.G. Kühn 1858
New Zealand
Taranaki
Rhizoctonia solani J.G. Kühn 1858
New Zealand
Wanganui
Rhizoctonia solani J.G. Kühn 1858
Vanuatu

Click to collapse Metadata Info

1cb1a204-36b9-11d5-9548-00d0592d548c
scientific name
Names_Fungi
30 September 2022
Click to go back to the top of the page
Top