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United States Department of Agriculture

Agricultural Research Service

Research Project: Systematics and Diagnostics of Emerging and Quarantine-Significant Plant Pathogenic Fungi

Location: Systematic Mycology and Microbiology

2013 Annual Report

1. Intercontinental fungi killing beech trees. Beech bark disease caused by fungi causes significant damage to beech trees both in Europe and North America. Exactly which fungus is killing the beech trees has been unclear because more than one kind of fungus is involved. This research confirmed that the fungus killing beech trees in North America is different from the one in Europe. Yet, another fungus was confirmed on beech trees and many hardwood trees in both Europe and North America. Surprisingly a fourth fungus occurs only in Asia on beech and other hardwood trees. This paper clearly defines the fungi associated with beech bark disease. Quarantine officials will use this research to prevent the movement of fungi the kill beech trees across continents.

2. A disease of oranges and other citrus crops called melanose or stem end rot is caused by a fungus that has been confused with fungi on other hosts. In this research three different species were found to occur on citrus in the United States. One of these is a species new to science known only from California and Spain. This new species is named, described and illustrated. Another species occurs only on citrus throughout the world. A third species that occurs on citrus is also found on other woody plants. This research will be used by plant breeders who are working to develop oranges and other citrus crops that are resistant to this disease. In addition plant quarantine officials will use this research to prevent the spread of these diseases on citrus.

3. Fungi can destroy invasive weeds without the use of harmful chemicals. In working to control Japanese stiltgrass, an invasive weed from Asia, a fungus was found that kills this weed. This fungus had never been seen before, so it was given a name after the host and described in detail in order to tell it from similar fungi. Portions of the DNA were sequenced and compared with other fungi. Plant pathologists and conservation biologists will determine if this new fungus can be safely and effectively used to control Japanese stiltgrass.

Review Publications
Minnis, A.M., Kennedy, A.H., Grenier, D.B., Palm, M.E., Rossman, A.Y. 2012. Phylogeny and taxonomic revision of the Planistromellaceae including its coelomycetous anamorphs: contributions towards a monograph of the genus Kellermania. Studies in Mycology. 29:11-28.

Crouch, J., Tomaso-Peterson, M. 2012. Anthracnose disease of centipedegrass turf caused by Colletotrichum eremochloae, a new fungal species closely related to Colletotrichum sublineola. Mycologia. 104(5):1085-1096.

O'Connell, R.J., Thon, M.R., Hacquard, S., Van Themaat, E.V., Amyotte, S., Kleemann, J., Torres-Quintero, M., Damm, U., Buiate, E., Epstein, L., Alkan, N., Altmuller, J., Alvarado, B.L., Bauser, C., Becker, C., Birren, B.W., Chen, Z., Crouch, J., Duvick, J., Farman, M., Gan, P., Heiman, D., Henrissat, B., Howard, R.J., Kabbage, M., Koch, C., Kubo, Y., Law, A., Lebrun, M.H., Lee, Y.H., Miyara, L., Moore, N., Neumann, U., Panaccione, D.G., Panstruga, R., Place, M., Proctor, R., Prusky, D., Rech, G., Reinhardt, R., Rollins, J.A., Rounsley, S., Schardl, C., Schwartz, D.C., Shenoy, N., Shirasu, K., Stuber, K., Sukno, S.A., Sweigard, J.A., Takano, Y., Takahara, H., Vanderdoes, H.C., Voll, L., Will, I., Young, S., Zeng, Q., Zhang, J., Zhou, S., Dickman, M.B., Schulze-Lefert, P., Ma, L.J., Vaillancourt, L.J. 2012. Life-style transitions in plant pathogenic Colletotrichum fungi deciphered by genome and transcriptome analyses. Nature Genetics. 44:1060-1065.

Molnar, T., Walsh, E., Capik, J., Sathuvalli, V., Mehlenbacher, S., Rossman, A.Y., Zhang, N. 2013. A real-time PCR assay for early detection of eastern filbert blight. Plant Disease. 97:813-818.

Voglmayr, H., Rossman, A.Y., Castlebury, L.A., Walter, J.M. 2012. Multigene phylogeny and taxonomy of the genus Melanconiella (Diaporthales). Fungal Diversity. 57:1-44.

Minnis, A.M., McTaggart, A.R., Rossman, A.Y., Aime, C.M. 2012. Taxonomy of mayapple rust: the genus Allodus resurrected. Mycologia. 104(4):942-950.

Salgado-Salazar, C., Rossman, A.Y., Samuels, G.J., Capdet, M., Chaverri, P. 2012. Multigene phylogenetic analyses of the Thelonectria coronata and T. veuillotiana species complexes. Mycologia. 104(6):1325-1350.

Baynes, M.A., Russell, D.M., Newcombe, G., Carta, L.K., Rossman, A.Y., Ismaiel, A.A. 2012. A mutualistic interaction between a fungivorous nematode and a fungus within the endophytic community of Bromus tectorum. Fungal Ecology. 5:610-623.

Walker, D., Castlebury, L.A., Rossman, A.Y., White, J. 2012. New molecular markers for fungal phylogenetics: Two genes for species level systematics in the Sordariomycetes (Ascomycota). Molecular Phylogenetics and Evolution. 64:500-512.

Walker, D.M., Castlebury, L.A., Rossman, A.Y., Mejía, L.C., White, J.F. 2012. Phylogeny and taxonomy of Ophiognomonia (Gnomoniaceae, Diaporthales), including twenty-five new species in this highly diverse genus. Fungal Diversity. 57:85-147.

Rajeshkumar, K.C., Rossman, A.Y. 2013. Taiwanascus samuelsii sp. nov., an addition to Niessliaceae from the Western Ghats, Kerala, India. IMA Fungus. 4(1):1-4.

Walker, D.M., Rossman, A.Y., Adams, G.C., Longa, C.M., Maresi, G. 2012. Valsalnicola D. Walker & Rossman, gen. nov. Persoonia: Molecular Phylogeny and Evolution of Fungi. 29:148-149.

Minnis, A.M., Rossman, A.Y., Kleczewski, N.M., Flory, L.S. 2012. Bipolaris microstegii Minnis, Rossman, Kleczewki & S.L. Flory, sp. nov. Persoonia: Molecular Phylogeny and Evolution of Fungi. 29:150-151.

Cariello, P.F., Wickes, B.L., Sutton, D.A., Castlebury, L.A., Levitz, S.M., Finberg, R.W., Thompson, E.H., Daly, J.S. 2013. Phomopsis bougainvilleicola prepatellar bursitis in a renal transplant recipient. Journal of Clinical Microbiology. 51(2):692-695.

Bruckart, W.L., Eskandari, F., Berner, D.K., Aime, M.C. 2012. Comparison of Puccinia acroptili from Eurasia and the USA. Botany. 90:465-471.

Herrera, C.S., Rossman, A.Y., Samuels, G.J., Lechat, C., Chaverri, P. 2013. Revision of the Genus Corallomycetella with Corallonectria gen. nov. for C. jatrophae (Nectriaceae, Hypocreales). Mycosystema. 32(3):518-544.

Bruckart, W.L., Eskandari, F., Coombs, E.M., Rossman, A.Y., Palm, M.E. 2013. First report of Pilidium concavum causing leaf necrosis on Fallopia japonica in the United States. Plant Disease. 97(1):146.

Hirooka, Y., Rossman, A.Y., Zhuang, W., Salgado-Salazar, C., Chaverri, P. 2013. Species delimitation for Neonectria coccinea group including the causal agents of beech bark disease in Asia, Europe, and North America. Mycosystema. 32:485-517.

Last Modified: 2/28/2015
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