Botryosphaeria corticola

Botryosphaeria corticola
Scientific classification
Kingdom: Fungi
Phylum: Ascomycota
Class: Dothideomycetes
Subclass: Incertae sedis
Order: Botryosphaeriales
Family: Botryosphaeriaceae
Genus: Botryosphaeria
Species: B. corticola
Binomial name
Botryosphaeria corticola
(A.J.L. Phillips, A. Alves & J. Luque) (2004)
Synonyms

Diplodia corticola

Bot canker of oak is a disease on stems, branches and twigs of oak trees in Europe and North America. The casual agent of Bot canker of oak is the fungus Botryosphaeria corticola . Bot canker of oak causes lesions and cankers on a wide range of oaks in Europe and most recently live oaks in North America. Some infections were formerly attributed to Botryosphaeria stevensii , but most likely represent infections by Botryosphaeria corticola .[1] Botryosphaeria corticola is distinguishable from Botryosphaeria stevensii via ITS rDNA sequencing.

Overview

Botryosphaeria corticola has caused infection of oak trees in Spain,[2] Portugal,[3] Morocco,[4] Italy,[5] Greece,[6] Hungary,[7] and the United States.[8][9][10] Bot canker of oak kills trees in natural forests as well as in cork plantations. The cork industry in Portugal, Spain, France, Italy, and Morocco has been dealing with declining oaks for several years from biotic and abiotic factors.[11] This disease has been seen in many cork plantations and is the most important contributor to the decline in the cork industry.[1] When cork is harvested from the trees, the cork cambium is exposed creating a wound for the fungus to enter the trunk, and cause disease. Infection of other oaks is most likely through wounds, also. These wounds may be natural wounds, but there is evidence insect damage is involved, especially in coast live oak in California.[9] Botryosphaeria corticola infects the twigs, branches and stems of oaks and degrades the cambial tissues. With the degradation of vascular tissues the trees display wilting and dieback symptoms.

Hosts

Cork oak ( Quercus suber )[2] Holm oak ( Quercus ilex )[3] Kermes oak ( Quercus coccifera )[6] Sessile oak ( Quercus petraea )[7]

Canyon live oak ( Quercus chrysolepis )[8] Coast live oak ( Quercus agrifolia )[9] Laurel oak ( Quercus laurifolia )[10] Live oak ( Quercus virginiana )[10] Grape ( Vitis sp. )[8]

Management

Botryosphaeria corticola can be managed in high value trees, but there is no current management for forest trees. Carbendazim and thiophanate-methyl have shown to prevent infection in cork oak in Europe, where it is applied after cork has been harvested. Sanitation is the most common management technique for this disease.[12] Branches with diseased tissue are pruned off, and heavily infected trees are removed. This prevents future infections by limiting the amount of spores in the area.

Description[1]

Botryosphaeria corticola (Diplodia corticola) is a ascomycete fungus. It has both sexual ( Diplodia corticola ) and asexual ( Botryosphaeria corticola ) stages occurring naturally.

The asexual spores (conidia) occur in pycnidia from conidiogenous cells, without conidiophores. Pycnidia are dark brown to black, circular, immersed, partially erumpent and up to 1 mm diameter.

The sexual spores are eight biseriate ascospores occur inside of asci occur in immersed, partially erumpent, dark brown to black pseudothecia, up to 1 mm in diameter.

References

  1. 1 2 3 Alves, A., Correia, A., Luque, J. and Phillips, A., 2004. Botryosphaeria corticola, sp. nov. on Quercus species, with notes and description of Botryosphaeria stevensii and its anamorph, Diplodia mutila. Mycologia 96: 598–613.
  2. 1 2 Luque J and Girbal, J. 1989. Dieback of cork oak (Quercus suber) in Catalonia (NE Spain) caused by Botryosphaeria stevensii. European Journal of Forest Pathology 19:7–13.
  3. 1 2 Santos, M. N. S. 1995. Phytopathological situation of cork oak (Quercus suber L.) in Portugal.IOBC⁄WPRS Bull. 18: 38–42.
  4. ↑ El-Badri, N. and Abadie, M. 2000. Observations on the dynamic of Diplodia mutila Fr. apud Mont. development on the cork-oak, Quercus suber L., in Morocco. Cryptogamic Mycology 21: 235–248.
  5. ↑ Franceschini, A., Corda, P., addau, L. and Marras, F. 1999. Observations sur Diplodia mutila, pathoge`ne du cheˆne-lie`ge en Sardaigne. IOBC⁄WPRS Bull. 22, 5–12.
  6. 1 2 Tsopelas, P., Slippers, B., Gonou-Zagou, Z. and Wingfield, M.J. 2009. First report of Diplodia corticola in Greece on kermes oak (Quercus coccifera). New Disease Reporter 20: 11.
  7. 1 2 Vajna L. 1986. Branch canker and dieback of sessile oak (Quercus petraea) in Hungary caused by Diplodia mutila I. Identification of the pathogen. European Journal of Forest Pathology 16:223–229.
  8. 1 2 3 Urbez-Torres, Peduto, F., Rooney-Lantham, S. and Gubler, W.D. 2010. First report of Diplodia corticola causing grapevine (Vitis vinifera) cankers and trunk cankers and dieback of canyon live oak (Quercus chrysolepis) in California. Plant Disease 94(6): 785.
  9. 1 2 3 Lynch, S.C., Eskalen, A., Zambino, P.J. and Scott, T. 2010. First report of Bot canker disease caused by Diplodia corticola on coast live oak (Quercus agrifolia) in California. Plant Disease Posted online on 13 Oct 2010, First Look.
  10. 1 2 3 Smith, J.A., personal communication, Feb. 2010.
  11. ↑ Brasier, C.M. 1996. Phytophthora cinnamomi and oak decline in southern Europe. Environmental constraints including climate change. Ann Sci For 53:347–358.
  12. ↑ Luque, J., Pera, J. and Parlade, J. 2007. Evaluation of fungicides for the control of Botryosphaeria corticola on cork oak in Catalonia (NE Spain). Forest Pathology 38: 147-155.
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