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ARS Home Crop Production and Protection People & Locations







Timothy L Widmer

                                                                (PhD)
                        Crop Production and Protection

                        




                        
                        National Program Leader
                        Phone: (240) 470-6956
                        
                        
                        Fax: (Employee information on this page comes from the REE Directory. Please contact your front office staff to update the REE Directory.)
                            **National Program Leader For:**
                                National Plant Diseases Recovery System
                                            Accession Number: 409350
                                        Biological Control in Integrated Weed Management of Invasive Weeds from Europe, Asia, and Africa
                                            Accession Number: 437656
                                        National Predictive Modeling Tool Initiative
                                            Accession Number: 438041
                                        Discovery and Development of Biological Control Agents for Weeds that are Invasive in the U.S. and Native to Australia and Asia
                                            Accession Number: 439628
                                        Integrated Management of South American Pests and Weeds
                                            Accession Number: 439642
                                        Integrative Genomic and Biological Approaches to Detect and Manage Emerging Foreign Fungal Plant Pathogens
                                            Accession Number: 440440
                                        Exploration for Natural Enemies in China for Citrus psyllid in the U.S.
                                            Accession Number: 440963
                                        Disease Management in Small Fruit and Nursery Crops Based on Knowledge of Pathogen Diversity, Biology, and Environmental Effects
                                            Accession Number: 441106
                                        Characterization and Detection of Viruses that Impact the Exchange and Curation of Plant Germplasm
                                            Accession Number: 441151
                                        Management of Aflatoxin and Other Mycotoxins in Row Crops such as Maize, Peanut, and Soybean
                                            Accession Number: 441472
                                        Develop an Improved Understanding of Microbe-pathogen Interactions for Biological Control
                                            Accession Number: 441614
                                        Characterization and Introgression of Nematode Resistance into Upland Cotton
                                            Accession Number: 441674
                                        Advancing Knowledge of the Biology and Etiology of Bacterial Plant Pathogens Towards Management Strategies
                                            Accession Number: 441736
                                        Biology and Management of Invasive Plant Pathogens Affecting Potato and Soybean
                                            Accession Number: 441741
                                        Development of Novel Disease Control Strategies Based on Virus and Viroid Biology
                                            Accession Number: 441761
                                        Discovery, Characterization, and Diagnostics of Endemic and Exotic Citrus Pathogens Using High Throughput Sequencing (HTS)
                                            Accession Number: 441768
                                        Molecular and Genetic Approaches to Manage Cotton and Sorghum Diseases
                                            Accession Number: 441817
                                        Uncovering Rootstock Disease Resistance Mechanisms in Deciduous Tree Fruit Crops and Development of Genetics-Informed Breeding Tools for Resistant Germplasm
                                            Accession Number: 441819
                                        Integrated Management of Nematodes in Southeastern Field Crops
                                            Accession Number: 441866
                                        Development of Pathogen- and Plant-Based Genetic Tools and Disease Mitigation Methods for Tropical Perennial Crops
                                            Accession Number: 441868
                                        Developing Genomic and Biological Resources to Characterize, Diagnose and Detect Emerging and Invasive Vectored Bacterial and Viral Plant Pathogens for Safeguarding U.S. Agriculture
                                            Accession Number: 441898
                                        Disease Management and Improved Detection Systems for Control of Pathogens of Vegetables and Strawberries
                                            Accession Number: 441968
                                        Mitigation of Domestic, Exotic, and Emerging Diseases of Subtropical and Temperate Horticultural Crops
                                            Accession Number: 442004
                                        Fungal Systematics and Diagnostic Resource Development for Safeguarding Plant Health
                                            Accession Number: 442086
                                        Use of Novel Peanut Genetic Sources and Natural Plant Defense Mechanisms for Resistance to Fungal Pathogens to Reduce Disease Pressure and Aflatoxin Contamination
                                            Accession Number: 442094
                                        Identify and Characterize Resistance to Soybean Pathogens and Pests
                                            Accession Number: 442114
                                        System Approaches Using Genomics and Biology to Manage Postharvest Fruit Decay, Antimicrobial Resistance, and Mycotoxins to Reduce Food Loss and Waste
                                            Accession Number: 442157
                                        Ecology and Genomics of Soilborne Pathogens, Beneficial Microbes, and the Microbiome of Wheat, Barley, and Biofuel Brassicas
                                            Accession Number: 442262
                                        Diagnostics and Biological Approaches for Management of Emerging Oomycete Plant Pathogens
                                            Accession Number: 442484
                                        Microscopy Applications for the Identification and Management of Agricultural Pests and Pathogens (Bridge)
                                            Accession Number: 442510
                                        Biological and Biotechnological Approaches for Management of Insect Vectors and Vector-borne Viruses Affecting Vegetable Crops
                                            Accession Number: 443069
                                        Development of Genomic Tools for Control and Characterization of Rhizoctonia solani and Other Soil-borne Plant Pathogens
                                            Accession Number: 443270
                                        Genomics and Genetic Improvement of Crop Resistance to Multiple Biotic and Abiotic Stresses in Peanut
                                            Accession Number: 445194**Publications**
                                                (Clicking on the reprint icon
                                                    Reprint Icon
                                                    will take you to the publication reprint.)A perspective on current therapeutic molecule screening methods against ‘candidatus liberibacter asiaticus’, the presumed causative agent of citrus Huanglongbing
                                                        

- (Peer Reviewed Journal)Kennedy, J.P., Wood, K., Pitino, M., Mandadi, K., Igwe, D., Shatters, R.G., Widmer, T.L., Niedz, R.P., Heck, M.L. 2023. A perspective on current therapeutic molecule screening methods against ‘candidatus liberibacter asiaticus’, the presumed causative agent of citrus Huanglongbing. Phytopathology. https://doi.org/10.1094/PHYTO-12-22-0455-PER.Plant pathogenic fungi harbor as endophytes in Rhododendron spp. native to the Eastern U.S.
                                                        

- (Peer Reviewed Journal)Widmer, T.L., Mcmahon, M.B., Luster, D.G. 2020. Plant pathogenic fungi harbor as endophytes in Rhododendron spp. native to the Eastern U.S.. Fungal Ecology. Fungal Ecology 47:100949. https://doi.org/10.1016/j.funeco.2020.100949.Compatibility of Trichoderma asperellum isolates to selected soil fungicides
                                                        

- (Peer Reviewed Journal)Widmer, T.L. 2019. Compatibility of Trichoderma asperellum isolates to selected soil fungicides. Crop Protection. 120:91-96. https://doi.org/10.1016/j.cropro.2019.02.017.Phytophthora stricta isolated from Rhododendron maximum in Pennsylvania

- (Peer Reviewed Journal)Widmer, T.L., Mcmahon, M.B., Frederick, R.D. 2018. Phytophthora stricta isolated from Rhododendron maximum in Pennsylvania. Plant Disease. 102:827.Effects of temperature on germination of sporangia, infection and protein secretion by Phytophthora kernoviae
                                                        

- (Peer Reviewed Journal)Shelley, B.A., Luster, D.G., Garrett, W.M., Mcmahon, M.B., Widmer, T.L. 2018. Temperature effects Phytophthora kernoviae infection, germination of sporangia and protein secretion. Plant Pathology. 67:719-728.Recovery of Phytophthora ramorum in plant tissue with mixed infections
                                                        

- (Peer Reviewed Journal)Widmer, T.L., Tooley, P.W., Camp, M.J. 2018. Recovery of Phytophthora ramorum in plant tissue with mixed infections. European Journal of Plant Pathology. 150:253-258.The effect of salinity on the growth, sporulation and infection of Phytophthora ramorum
                                                        

- (Peer Reviewed Journal)Preuett, J.A., Collins, D.J., Luster, D.G., Widmer, T.L. 2016. The effect of salinity on the growth, sporulation and infection of Phytophthora ramorum. Fungal Ecology. 23:123-130.Bioassay conditions for infection of Pinus radiata seedlings with Phytophthora pinifolia zoospores
                                                        

- (Peer Reviewed Journal)Widmer, T.L., Dodge, S.C. 2015. Bioassay conditions for infection of Pinus radiata seedlings with Phytophthora pinifolia zoospores. Plant Disease. 99:1204-1209.Differences in virulence and sporulation of Phytophthora kernoviae isolates originating from two distinct geographical regions
                                                        

- (Peer Reviewed Journal)Widmer, T.L. 2015. Differences in virulence and sporulation of Phytophthora kernoviae isolates originating from two distinct geographical regions. Plant Disease. 99:460-466.Screening Trichoderma species for biological control activity against Phytophthora ramorum in soil

- (Peer Reviewed Journal)Widmer, T.L. 2014. Screening Trichoderma species for biological control activity against Phytophthora ramorum in soil. Biological Control. 79:43-48.Phytophthora megakarya

- (Peer Reviewed Journal)Widmer, T.L., Hebbar, P.K. 2013. Phytophthora megakarya. Forest Phytophthoras. doi: 10.5399/OSU/fp.3.1.3386.Screening selected Gulf Coast forest species for susceptibility to Phytophthora ramorum

- (Peer Reviewed Journal)Preuett, J.A., Collins, D.J., Luster, D.G., Widmer, T.L. 2013. Screening selected Gulf Coast forest species for susceptibility to Phytophthora ramorum. Plant Health Progress. PHP 2013-0730-01-RS.Can Epiphytes reduce disease symptoms caused by Phytophthora ramorum

- (Peer Reviewed Journal)Widmer, T.L., Dodge, S.C. 2013. Can Epiphytes reduce disease symptoms caused by Phytophthora ramorum. Biological Control. 65:135-141.Root susceptibility and inoculum production from roots of Eastern United States oak species to Phytophthora ramorum

- (Peer Reviewed Journal)Widmer, T.L., Shishkoff, N., Dodge, S.C. 2012. Root susceptibility and inoculum production from roots of Eastern United States oak species to Phytophthora ramorum. Plant Disease. 96:1675-1682.Survival of Phytophthora kernoviae oospores, sporangia, and mycelium

- (Peer Reviewed Journal)Widmer, T.L. 2011. Survival of Phytophthora kernoviae oospores, sporangia, and mycelium. New Zealand Journal of Forestry Science. 41S:S15-S23.Field damage to yellow starthistle infected by Synchytrium solstitiale, and greenhouse maintenance and host range of the fungus

- (Peer Reviewed Journal)Eskandari, F., Bruckart, W.L., Widmer, T.L. 2011. Field damage to yellow starthistle infected by Synchytrium solstitiale, and greenhouse maintenance and host range of the fungus. Plant Disease. DOI: 10.1094/PDis-2-11-0139.Synchytrium solstitiale: reclassification based on the function and role of resting spores

- (Peer Reviewed Journal)Bruckart, W.L., Eskandari, F., Widmer, T.L. 2011. Synchytrium solstitiale: reclassification based on the function and role of resting spores. Mycologia. DOI: 10.3852/10-286.Whole plant inoculations of Viburnum species and cultivars testing for susceptibility to Phytophthora ramorum

- (Peer Reviewed Journal)Widmer, T.L. 2010. Whole plant inoculations of Viburnum species and cultivars testing for susceptibility to Phytophthora ramorum. Journal of Environmental Horticulture. 28:197-202.Phytophthora kernoviae oospore maturity, germination, and infection

- (Peer Reviewed Journal)Widmer, T.L. 2010. Phytophthora kernoviae oospore maturity, germination, and infection. Fungal Biology.  doi:10.1016/j.funbio.2010.06.001.  114:661-668.Root susceptibility and inoculum production from roots of eastern oak species to Phytophthora ramorum

- (Abstract Only)Widmer, T.L., Shishkoff, N., Dodge, S.C. 2010. Root susceptibility and inoculum production from roots of eastern oak species to Phytophthora ramorum. Phytopathology. 100/S136.Differentiating Phytophthora ramorum and P. kernoviae from other species isolated from foliage of rhododendrons

- (Peer Reviewed Journal)Widmer, T.L. 2010. Differentiating Phytophthora spp. isolated from leaves and stems of rhododendron plants. Plant Health Progress. doi: 10.1094/PHP-2010-0317-01-RS.Long-term survival of Phytophthora kernoviae oospores

- (Proceedings)Screening Trichoderma asperellum as a Mycoparasite on Phytophthora ramorum

- (Proceedings)Susceptibility of sprouted oak acorns to Phytophthora ramorum zoospores

- (Abstract Only)Widmer, T.L., Dodge, S.C. 2009. Susceptibility of sprouted oak acorns to Phytophthora ramorum zoospores. Phytopathology. 99:5205.Standardizing the Nomenclature for Clonal Lineages of the Sudden Oak Death Pathogen, Phytophthora ramorum

- (Peer Reviewed Journal)Grunwald, N.J., Goss, E.M., Ivors, K., Garbelotto, M., Martin, F.N., Prospero, S., Hansen, E., Bonants, P., Hamelin, R., Chastagner, G., Werres, S., Rizzo, D.M., Abad, G., Beales, P., Bilodeau, G.J., Blomquist, C., Brasier, C., Briere, S., Chandelier, A., Davidson, J.M., Denman, S., Elliott, M., Fichtner, E.J., Frankel, S.J., Goheen, E.M., De Gruyter, H., Heungens, K., James, D., Kanaskie, A., Mcwilliams, M., Moralejo, E., Osterbauer, N.K., Palm, M.E., Parke, J.L., Shamoun, S.F., Shishkoff, N., Tooley, P.W., Vettraino, A., Webber, J., Widmer, T.L. 2009. Standardizing the nomenclature for clonal lineages of the sudden oak death pathogen, Phytophthora ramorum. Phytopathology. 99:792-795.Recovery Plan for Phytophthora kernoviae Causing Bleeding Trunk Cankers, Leaf Blight and Stem Dieback in Trees and Shrubs

- (Government Publication)Benson, M., Ivors, K., Koch, F., Fichtner, E., Garbelotto, M., Rizzo, D., Tjosvold, S., Hansen, E., Parke, J., Hong, C., Chastagner, G., Jeffers, S., Woodward-Williams, J., Kim, S., Britton, K., Denitto, G., Frankel, S., Micales, J., Grunwald, N.J., Martin, F.N., Shishkoff, N., Smith, K.L., Tooley, P.W., Widmer, T.L., Bulluck, R., Burnett, G., Ferguson, L., Fowler, G., Garrett, L., Jones, J., Magarey, R., Randall-Schadel, B., Cardwell, K., Draper, M., Chand-Goyal, T. 2009. Recovery Plan for Phytophthora kernoviae Causing Bleeding Trunk Cankers, Leaf Blight and Stem Dieback in Trees and Shrubs. Government Publication/Report. Available at: http://www.ars.usda.gov/SP2UserFiles/Place/00000000/opmp/P.%20kernoviae%2081100.pdfComparing necrosis of Rhododendron leaf tissue inoculated with Phytophthora ramorum sporangia or zoospores

- (Peer Reviewed Journal)Widmer, T.L. 2008. Comparing necrosis of Rhododendron leaf tissue inoculated with Phytophthora ramorum sporangia or zoospores. Plant Disease. 93:30-35.Protocol for maintenance of Synchytrium solstitiale, cause of false rust on yellow starthistle, under greenhouse conditions

- (Abstract Only)Eskandari, F., Bruckart, W.L., Widmer, T.L. 2008. Protocol for maintenance of Synchytrium solstitiale, cause of false rust on yellow starthistle, under greenhouse conditions. Phytopathology. 98(6,Supplement)S214-215Comparing New Zealand and United Kingdom isolates of Phytophthora kernoviae

- (Abstract Only)Widmer, T.L. 2008. Comparing New Zealand and United Kingdom isolates of Phytophthora kernoviae. Phytopathology. 98:S171Investigating the potential of biological control against Phytophthora ramorum

- (Proceedings)Widmer, T.L. 2008. Investigating the potential of biological control against Phytophthora ramorum. Sudden Oak Death Science Symposium.  Frankel, S.J., Kliejunns, J.T. and Palmieri, K. M. (eds).  USDA Forest Service Gen. Tech. Rep. PSW-GTR-214, Albany, CA. p. 491Isolation and identification of mycoparasitic isolates of Trichoderma asperellum with potential for suppression of black pod disease of cacao in Cameroon

- (Peer Reviewed Journal)Tondje, P., Roberts, D.P., Bon, M., Widmer, T.L., Samuels, G.J., Ismaiel, A.A., Begoude, A., Tchana, T., Nyemb-Tshomb, E., Ndoumbe-Nkeng, M., Bateman, D., Fontem, D., Hebbar, K. 2007. Isolation and identification of mycoparasitic isolates of Trichoderma asperellum with potential for suppression of black pod disease of cacao in Cameroon. Biocontrol.AN IPM PROGRAM FOR THE MANAGEMENT OF FUNGAL LEAF BLIGHT DISEASES OF CARROT IN NEW YORK

- (Peer Reviewed Journal)Gugino, B.K., Carroll, J.E., Widmer, T.L., Chen, P., Abawi, G.S. 2007. An ipm program for the management of fungal leaf blight diseases of carrot in new york. Plant Disease 91:59-65FIELD EVALUATION OF CARROT CULTIVARS FOR SUSCEPTIBILITY TO FUNGAL LEAF BLIGHT DISEASES IN NEW YORK

- (Peer Reviewed Journal)Gugino, B.K., Carroll, J.E., Widmer, T.L., Chen, P., Abawi, G.S. 2007. Field evaluation of carrot cultivars for susceptibility to fungal leaf blight diseases in new york. Crop Protection 26:709-714IMPACT OF SYNCHYTRIUM SOLSTITIALE ON YELLOW STARTHISTLE SEEDLINGS AND MATURE PLANTS

- (Abstract Only)Widmer, T.L. 2006. Impact of synchytrium solstitiale on yellow starthistle seedlings and mature plants. Phytopathology 96:S122.Prospects for Biological Control of Teasels, Dipsacus SPP, in the United States

- (Peer Reviewed Journal)Rector, B.G., Harizanova, V., Sforza, R., Widmer, T.L., Wiedenmann, R.N. 2006. PROSPECTS FOR BIOLOGICAL CONTROL OF TEASELS, DIPSACUS SPP., IN THE UNITED STATES. Biological Control. 1:1-14.FACTORS AFFECTING INFECTION OF YELLOW STARTHISTLE (CENTAUREA SOLSTITIALIS) BY SYNCHYTRIUM SOLSTITIALE, CAUSAL AGENT OF FALSE RUST DISEASE

- (Peer Reviewed Journal)Widmer, T.L., Guermache, F. 2006. Factors affecting infection of yellow starthistle (centaurea solstitialis) by synchytrium solstitiale, causal agent of false rust disease. Plant Disease. 90:425-428CRYOPRESERVATION OF SYNCHYTRIUM SOLSTITIALE IN PLANTA

- (Peer Reviewed Journal)Widmer, T.L. 2006. Cryopreservation of synchytrium solstitiale in planta. Plant Disease. 90:429-432BIOLOGICAL CONTROL OF YELLOW STARTHISTLE: NEW PROSPECTS FOR AN OLD PROBLEM.

- (Abstract Only)Smith, L., Cristofaro, M., Pitcairn, M., Bruckart, W.L., Woods, D., Widmer, T.L., Berner, D.K., Drew, A.E. 2004. Biological control of yellow starthistle: new prospects for an old problem.. Ecological Society of America Proceedings.CENTAUREA SOLSTITIALIS : ROOT EXTRACT INHIBITION OF PLANT PATHOGENIC FUNGI

- (Proceedings)Guermache, F., Widmer, T.L. 2004. Centaurea solstitialis : root extract inhibition of plant pathogenic fungi. 12th International Conference on Weed Biology, Dijon, France pp. 427-431. INRA, Dijon, France.FORMULATION OF PHOMA EXIGUA, POTENTIAL BIOCONTROL AGENT AGAINST CENTAUREA SOLSTITIALIS

- (Proceedings)Laurent, N., Gras, S., Quimby Jr, P.C., Widmer, T.L. 2004. Formulation of phoma exigua, potential biocontrol agent against centaurea solstitialis. 12th International Conference on Weed Biology, Dijon, France pp.399-406. INRA, Dijon, France.FILTRATES OF RHIZOSPHERE BACTERIA SUPPRESSIVE TO CENTAUREA SOLSTITIALIS SEED GERMINATION

- (Peer Reviewed Journal)Widmer, T.L., Guermache, F. 2004. Filtrates of rhizosphere bacteria suppressive to Centaurea solstitialis seed germination. Journal of Plant Diseases and Protection. Special Issue XIX:497-502FORMULATION OF SCLEROTINIA SCLEROTIORUM FOR USE AGAINST CIRSIUM ARVENSE

- (Peer Reviewed Journal)Quimby Jr, P.C., Gras, S., Widmer, T.L., Meikle, W.G., Sands, D. 2004. Formulation of sclerotinia sclerotiorum for use against cirsium arvense. Journal of Plant Diseases and Protection. Special Issue XIX:491-495EXPLORATION FOR PLANT PATHOGENS AGAINST TAENIATHERUM CAPUT-MEDUSAE (MEDUSAHEAD)

- (Proceedings)Widmer, T.L., Sforza, R. 2004. Exploration for plant pathogens against taeniatherum caput-medusae (medusahead). XI Symposium on Biological Control of Weeds (eds Cullen, J.M., Briese, D.T., Kriticos, D.J., Londsdale, W.M., Morin, L. and Scott, J.K.) pp. 193-197. CSIRO Entomology, Canberra, Australia.MOLECULAR IDENTIFICATION OF A NEW MEMBER OF THE CLOVER PROLIFERATION PHYTOPLASMA GROUP (16SRVI) ASSOCIATED WITH CENTAUREAE SOLSTITIALIS VIRESCENCE IN ITALY.

- (Peer Reviewed Journal)Faggioli, F., Pasquini, G., Campobasso, G., Widmer, T.L., Quimby Jr, P.C. 2004. Molecular identification of a new member of the clover proliferation phytoplasma group (16srvi) associated with centaureae solstitialis virescence in italy.. European Journal Of Plant Pathology. 110:353-360In Vitro Culturing of Yellow Starthistle (Centaurea solstitialis) for Screening Biological Control Agents.

- (Peer Reviewed Journal)Guermache, F., Vidal, K., Widmer, T.L. 2004. In Vitro Culturing of Yellow Starthistle (Centaurea solstitialis) for Screening Biological Control Agents. Biological Control 30:330-335.PLANT PATHOLOGY AND BIOLOGICAL CONTROL OF INVASIVE WEEDS

- (Book / Chapter)BRUCKART, W.L., BERNER, D.K., CAESAR, A.J., WIDMER, T.L. PLANT PATHOLOGY AND BIOLOGICAL CONTROL OF INVASIVE WEEDS. Biological Control of Invasive Plants in the United States. In Plant Pathology and Biological Control of Invasive Weeds.  E.M. Combs, J.K. Clark, G.L. Piper, and A.F. Cofrancesco (EDS). Oregon State University Press, Corvallis, OR. 2004.SYNCHYTRIUM SOLSTITIALE SP. NOV. CAUSING A FALSE RUST ON CENTAUREA SOLSTITIALIS IN FRANCE

- (Peer Reviewed Journal)Widmer, T.L. 2004. Synchytrium solstitiale sp. nov. causing a false rust on centaurea solstitialis in france. Mycologia. 96(2):407-410THE POTENTIAL CONTRIBUTION OF NATURAL ENEMIES FROM MEDITERRANEAN EUROPE TO THE MANAGEMENT OF THE INVASIVE WEED ARUNDO DONAX (GRAMINAE:ARUNIDINAE) IN THE USA

- (Proceedings)Kirk, A.A., Widmer, T.L., Campobasso, G., Carruthers, R.I., Dudley, T. 2003. The potential contribution of natural enemies from Mediterranean Europe to the management of the invasive weed arundo donax (graminae:arunidinae) in the usa. In: Proceedings of the California Invasive Plant Council Symposium, Vol. 7 (ed. Pirosko, C.) pp. 62-68. California Invasive Plant Council, Berkley, CA, USA.FIRST REPORT OF FUSARIUM ARTHROSPORIOIDES ON MEDUSAHEAD (TAENIATHERUM CAPUT-MEDUSAE) AND PRELIMINARY TESTS FOR HOST-SPECIFICITY

- (Peer Reviewed Journal)SEIGWART, M., BON, M., WIDMER, T.L., CRESPY, N., SFORZA, R. FIRST REPORT OF FUSARIUM ARTHROSPORIOIDES ON MEDUSAHEAD (TAENIATHERUM CAPUT-MEDUSAE) AND PRELIMINARY TESTS FOR HOST-SPECIFICITY. PLANT PATHOLOGY. 2003.FIRST REPORT OF PHOMA EXIGUA ON CENTAUREA SOLSTITIALIS [ASTERACEAE] IN RUSSIA

- (Peer Reviewed Journal)Widmer, T.L., Castlebury, L.A., Rossman, A.Y. 2002. First report of phoma exigua on centaurea solstitialis [asteraceae] in russia. Plant Disease 86:922IMPACT OF ORGANIC MATTER MANAGEMENT ON PLANT-PARASITIC NEMATODES, THEIR DAMAGE TO HOST CROPS AND SOIL HEALTH

- (Peer Reviewed Journal)RELATIONSHIP BETWEEN LEVELS OF CYANIDE IN SUDANGRASS HYBRIDS INCORPORATED INTO SOIL AND SUPPRESSION OF MELOIDOGYNE HAPLA

- (Peer Reviewed Journal)Widmer, T.L., Abawi, G.S. 2002. Relationship between levels of cyanide in sudangrass hybrids incorporated into soil and suppression of Meloidogyne hapla. Journal of Nematology. 34:16-22.IMPACT OF SOIL HEALTH MANAGEMENT PRACTICES ON SOILBORNE PATHOGENS AND ROOT DISEASES OF VEGETABLES.

- (Review Article)Widmer, T.L., Abawi, G.S. 2000. Impact of soil health management practices on soilborne pathogens and root diseases of vegetables. Applied Soil Ecology.  15:37-47.MECHANISM OF SUPPRESSION OF MELOIDOGYNE HAPLA AND ITS DAMAGE BY A GREEN MANURE OF SUDAN GRASS

- (Peer Reviewed Journal)Widmer, T.L., Abawi, G.S. 2000. Mechanism of suppression of meloidogyne hapla and its damage by a green    manure of sudan grass. Plant Disease. 84:562-568.
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