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Charcoal rot

Scientific Name
Macrophomina phaseolina
Scientific Author
(Tassi) Goidànich
Taxonomy
Ascomycota, Dothideomycetes, Botryosphaeriales, Botryosphaeriaceae
Risk
Unknown
Status
Native Thailand Disease Species
Reliability
High
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Diagnostic Images (6)
Diagnostic Notes
Initial symptoms develop on roots and appear as water-soaked lesion. The lesions turn brown or black with age. The fungus continues to invade plant tissue from the crown up and causes similar water-soaking and discoloration in the pith. The pith eventually disintegrates leaving only the vascular strand in tact. Numerous, small, black sclerotia from on these strands and are easily visible when stalks are split open. The most characteristic outward symptom of the disease is lodging. The often occurs in the driest part of the field. Description from Federiksen (1986)

Agar cultures are black and homogeneous because of microsclerotia formed all over. Pycnidia are black and globose with ostiolate apically. Conidiophores hyaline, simple, cylindrical, narrowing apically. Conidia hyaline, cylindrical, 1-celled. Microsclerotia are black and homogeneous in size. Pycnidia 130-230 µm in diameter ; ostioles 15-35 µm in diameter. Conidiophores 13-23 x 3-6 µm. Conidia 14-35 x 6-11.5 µm. Sclerotia 60-120 µm in diameter. Hyphae 2.5-7.5 µm wide. Description from Watanabe (2002)

sclerotia on plant = 47-117(+14.41) x 55-137(+19.99) µm

sclerotia on media = 32-68 (+8.16) x 44-120 (+14.81) µm

pycnidia on plant = 82-206 (+88.79) x 103-267 (+96.87) µm

conidia = 5-10(+0.76) x 12-26(+2.75) µm

More Information
Specimen Contact
Photchana Trakunsukharat
Author
Trakunsukharat, P., Songsang, P.
Created
25/02/2011 09:27 AEST
Last Updated
25/02/2011 21:35 AEST
Citation
Trakunsukharat, P., Songsang, P. (2011) Charcoal rot (Macrophomina phaseolina) Updated on 2/25/2011 9:35:03 PM Available online: PaDIL - http://www.padil.gov.au.
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Free for use under the Creative Commons Attribution 3.0 Australia License

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