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  1. Characterization of a virulence factor in Plasmodiophora brassicae, with molecular markers for identification

    Article • PLoS ONE, September 2023, PLOS

    Professor Mary Ruth McDonald

  2. Weed hosts and winter survival of Stemphylium vesicarium on onion in Ontario, Canada

    Article • Canadian Journal of Plant Pathology, November 2022, Taylor & Francis

    Professor Mary Ruth McDonald

  3. Grasses and field crops reduce the concentration of resting spores of Plasmodiophora brassicae in soil under controlled conditions

    Article • Plant Pathology, July 2022, Wiley

    Professor Mary Ruth McDonald

  4. Human vs. Machine, the Eyes Have It. Assessment of Stemphylium Leaf Blight on Onion Using Aerial Photographs from an NIR Camera

    Article • Remote Sensing, January 2022, MDPI AG

    Professor Mary Ruth McDonald

  5. Stemphylium Leaf Blight: A Re-Emerging Threat to Onion Production in Eastern North America

    Article • Plant Disease, December 2021, Scientific Societies

    Professor Mary Ruth McDonald

  6. Clubroot resistance in canola and brassica vegetable cultivars in Ontario, Canada

    Article • Canadian Journal of Plant Science, October 2021, Canadian Science Publishing

    Professor Mary Ruth McDonald

  7. Optimizing methods to sample and quantify stem and bulb nematode, Ditylenchus dipsaci, in garlic, Allium sativum, field soil

    Article • Canadian Journal of Plant Pathology, July 2021, Taylor & Francis

    Professor Mary Ruth McDonald

  8. The Role of Ascospores and Conidia, in Relation to Weather Variables, in the Epidemiology of Stemphylium Leaf Blight of Onion

    Article • Plant Disease, July 2021, Scientific Societies

    Professor Mary Ruth McDonald

  9. Soil amendments and fumigation for the management of Fusarium wilt of bunching spinach in Ontario, Canada

    Article • Crop Protection, July 2021, Elsevier

    Professor Mary Ruth McDonald

  10. Seed treatment of canola (Brassica napus) with the endomycorrhizal fungus Piriformospora indica does not reduce clubroot

    Article • Canadian Journal of Plant Science, June 2021, Canadian Science Publishing

    Professor Mary Ruth McDonald

  11. Risk assessment of secondary metabolites produced by fungi in the genus Stemphylium

    Article • Canadian Journal of Microbiology, June 2021, Canadian Science Publishing

    Professor Mary Ruth McDonald

  12. Ditylenchus dipsaci and Fusarium oxysporum on garlic: one plus one does not equal two

    Article • Canadian Journal of Plant Pathology, May 2021, Taylor & Francis

    Professor Mary Ruth McDonald

  13. Entomopathogenic nematodes for control of carrot weevil: efficacy and longevity in muck and mineral soils

    Article • Pest Management Science, February 2021, Wiley

    Professor Mary Ruth McDonald

  14. Oviposition, Feeding Preferences and Distribution of Delia Species (Diptera: Anthomyiidae) in Eastern Canadian Onions

    Article • Insects, November 2020, MDPI AG

    Professor Mary Ruth McDonald

  15. The disease, clubroot, is spreading among canola fields in Ontario, Canada

    Article • Canadian Journal of Plant Pathology, September 2020, Taylor & Francis

    Professor Mary Ruth McDonald

  16. Fungicide efficacy and timing for the management of Stemphylium vesicarium on onion

    Article • Canadian Journal of Plant Pathology, August 2020, Taylor & Francis

    Professor Mary Ruth McDonald

  17. Interaction of solarization, fumigation, and totally impermeable film for the management of clubroot (Plasmodiophora brassicae) on brassica crops

    Article • Acta Horticulturae, February 2020, International Society for Horticultural Science (ISHS)

    Professor Mary Ruth McDonald

  18. Maturation of resting spores of Plasmodiophora brassicae continues after host cell death

    Article • Plant Pathology, December 2019, Wiley

    Professor Mary Ruth McDonald

  19. New technologies could enhance natural biological control and disease management and reduce reliance on synthetic pesticides

    Article • Canadian Journal of Plant Pathology, November 2019, Taylor & Francis

    Professor Mary Ruth McDonald

  20. Whole-genome DNA similarity and population structure of Plasmodiophora brassicae strains from Canada

    Article • BMC Genomics, October 2019, Springer Science + Business Media

    Professor Mary Ruth McDonald

  21. The effect of biochar on plant growth was tested in mineral soils in southern Ontario, Canada.

    Article • Canadian Journal of Plant Science, October 2019, Canadian Science Publishing

    Professor Mary Ruth McDonald

  22. Sustainable carrot production

    Article • September 2019, Burleigh Dodds Science Publishing Limited

    Professor Mary Ruth McDonald

  23. Evaluating the current integrated pest management recommendations in Canada for carrot weevil (Coleoptera: Curculionidae) and carrot rust fly (Diptera: Psilidae)

    Article • The Canadian Entomologist, April 2019, Cambridge University Press

    Professor Mary Ruth McDonald

  24. Comparison of techniques for estimation of resting spores ofPlasmodiophora brassicaein soil

    Article • Plant Pathology, March 2019, Wiley

    Professor Mary Ruth McDonald

  25. Development of Plasmodiophora brassicae in the root cortex of cabbage over time

    Article • European Journal of Plant Pathology, February 2019, Springer Science + Business Media

    Professor Mary Ruth McDonald

  26. Susceptibility to Stemphylium vesicarium of asparagus, onion, pear, and rye in Canada

    Article • Canadian Journal of Plant Pathology, January 2019, Taylor & Francis

    Professor Mary Ruth McDonald

  27. Evaluation of the TOM-CAST Forecasting Model in Asparagus for Management of Stemphylium Leaf Spot in Ontario, Canada

    Article • Plant Disease, November 2018, Scientific Societies

    Professor Mary Ruth McDonald

  28. Assessing new chemical control options for the carrot weevil ( Listronotus oregonensis ) and carrot rust fly ( Psila rosae ) in Ontario

    Article • Crop Protection, July 2018, Elsevier

    Professor Mary Ruth McDonald

  29. Vegetables and Climate Change

    Article • June 2018, Wiley

    Professor Mary Ruth McDonald

  30. The Impact of the Carrot Rust Fly and Carrot Weevil Integrated Pest Management Program on the Ground-Dwelling Beetle Complex in Commercial Carrot Fields at the Holland Marsh, Ontario, Canada

    Article • Environmental Entomology, May 2018, Oxford University Press (OUP)

    Professor Mary Ruth McDonald

  31. Proteomic Profiles of Adipose and Liver Tissues from an Animal Model of Metabolic Syndrome Fed Purple Vegetables

    Article • Nutrients, April 2018, MDPI AG

    Professor Mary Ruth McDonald

  32. Virulence and pathotype classification of Plasmodiophora brassicae populations collected from clubroot resistant canola (Brassica napus) in Canada

    Article • Canadian Journal of Plant Pathology, April 2018, Taylor & Francis

    Professor Mary Ruth McDonald, Dr Michael W Harding

  33. The Effect of Anthocyanin-Rich Purple Vegetable Diets on Metabolic Syndrome in Obese Zucker Rats

    Article • Journal of Medicinal Food, December 2017, Mary Ann Liebert Inc

    Professor Mary Ruth McDonald

  34. First report of clubroot (Plasmodiophora brassicae) on canola in Ontario

    Article • Canadian Journal of Plant Pathology, November 2017, Taylor & Francis

    Professor Mary Ruth McDonald

  35. Weather thresholds for clubroot development on canola and brassica vegetables

    Article • Canadian Journal of Plant Pathology, September 2017, Taylor & Francis

    Professor Mary Ruth McDonald

  36. Fine Mapping of a Clubroot Resistance Gene in Chinese Cabbage Using SNP Markers Identified from Bulked Segregant RNA Sequencing

    Article • Frontiers in Plant Science, August 2017, Frontiers

    Professor Mary Ruth McDonald

  37. Suppression of clubroot by dazomet fumigant

    Article • Canadian Journal of Plant Science, August 2017, Canadian Science Publishing

    Professor Mary Ruth McDonald

  38. First Report of the Carrot Cyst Nematode (Heterodera carotae) From Carrot Fields in Ontario, Canada

    Article • Plant Disease, June 2017, Scientific Societies

    Professor Mary Ruth McDonald

  39. Propidium Monoazide Improves Quantification of Resting Spores of Plasmodiophora brassicae with qPCR

    Article • Plant Disease, March 2017, Scientific Societies

    Professor Mary Ruth McDonald

  40. Vertical distribution of resting spores of Plasmodiophora brassicae in soil

    Article • European Journal of Plant Pathology, March 2017, Springer Science + Business Media

    Professor Mary Ruth McDonald

  41. Metabolic cost of resistance in clubroot-resistant canola and napa cabbage

    Article • Canadian Journal of Plant Pathology, January 2017, Taylor & Francis

    Professor Mary Ruth McDonald

  42. High Tunnels Can Promote Growth, Yield, and Fruit Quality of Organic Bitter Melons (Momordica charantia) in Regions with Cool and Short Growing Seasons

    Article • HortScience, January 2017, American Society for Horticultural Science

    Professor Mary Ruth McDonald

  43. Identification of Genome-Wide Variants and Discovery of Variants Associated with Brassica rapa Clubroot Resistance Gene Rcr1 through Bulked Segregant RNA Sequencing

    Article • PLoS ONE, April 2016, PLOS

    Professor Mary Ruth McDonald

  44. Effect of soil type, organic matter content, bulk density and saturation on clubroot severity and biofungicide efficacy

    Article • Plant Pathology, March 2016, Wiley

    Professor Mary Ruth McDonald

  45. Finding new ways to control carrot rust fly (Psila rosae) in Ontario, Canada

    Article • January 2016, Entomological Society of America

    Professor Mary Ruth McDonald

  46. Spread ofPlasmodiophora brassicaeon canola in Canada, 2003–2014: Old pathogen, new home

    Article • Canadian Journal of Plant Pathology, October 2015, Taylor & Francis

    Professor Mary Ruth McDonald

  47. Improved detection of resting spores of P. brassicae in soil

    Article • Plant Disease, July 2015, Scientific Societies

    Professor Mary Ruth McDonald

  48. The influence of nitrogen and calcium fertilizers on septoria late blight and yield of celery

    Article • Canadian Journal of Plant Science, November 2014, Canadian Science Publishing

    Professor Mary Ruth McDonald

  49. The Role of Primary and Secondary Infection in Host Response to Plasmodiophora brassicae

    Article • Phytopathology, October 2014, Scientific Societies

    Professor Mary Ruth McDonald

  50. Assessment of spatial distribution of ascospores ofSclerotinia sclerotiorumfor regional disease forecasting in carrots

    Article • Canadian Journal of Plant Pathology, September 2014, Taylor & Francis

    Professor Mary Ruth McDonald

  51. Cortical Colonization by Plasmodiophora brassicae in Susceptible and Resistant Cabbage Cultivars

    Article • European Journal of Plant Pathology, August 2014, Springer Science + Business Media

    Professor Mary Ruth McDonald

  52. Recent changes in fungicide use and the fungicide insensitivity of plant pathogens in Canada

    Article • Canadian Journal of Plant Pathology, July 2014, Taylor & Francis

    Herve Van der Heyden, Professor Mary Ruth McDonald, Dr Lawrence Kawchuk

  53. Incidence and Severity of Cavity Spot of Carrot as Affected by Pigmentation, Temperature, and Rainfall

    Article • Plant Disease, July 2014, Scientific Societies

    Professor Mary Ruth McDonald

  54. Nitrogen and Fungicide Applications for the Management of Fungal Blights of Carrot

    Article • HortScience, May 2014, American Society for Horticultural Science

    Professor Mary Ruth McDonald

  55. Effect of environmental parameters on clubroot development and the risk of pathogen spread

    Article • Canadian Journal of Plant Pathology, February 2014, Taylor & Francis

    Professor Mary Ruth McDonald

  56. Crop rotation, cultivar resistance, and fungicides/biofungicides for managing clubroot (Plasmodiophora brassicae) on canola

    Article • Canadian Journal of Plant Pathology, February 2014, Taylor & Francis

    Professor Mary Ruth McDonald

  57. Effect of boron on clubroot of canola in organic and mineral soils and on residual toxicity to rotational crops

    Article • Canadian Journal of Plant Science, January 2014, Canadian Science Publishing

    Professor Mary Ruth McDonald

  58. Evaluation of Air Sampling and Detection Methods to Quantify Airborne Ascospores ofSclerotinia sclerotiorum

    Article • Plant Disease, January 2014, Scientific Societies

    Professor Mary Ruth McDonald

  59. ASSESSMENT OF CROP ROTATION, CULTIVAR RESISTANCE AND BACILLUS SUBTILIS BIOFUNGICIDE FOR CONTROL OF CLUBROOT ON CANOLA

    Article • Acta Horticulturae, September 2013, International Society for Horticultural Science (ISHS)

    Professor Mary Ruth McDonald

  60. First Report of Downy Mildew Caused by Peronospora belbahrii on Basil (Ocimum spp.) in Ontario

    Article • Plant Disease, September 2013, Scientific Societies

    Professor Mary Ruth McDonald

  61. Interaction of pH and temperature affect infection and symptom development ofPlasmodiophora brassicaein canola

    Article • Canadian Journal of Plant Pathology, July 2013, Taylor & Francis

    Professor Mary Ruth McDonald

  62. Reaction of selected Brassica vegetable crops to Canadian pathotypes ofPlasmodiophora brassicae

    Article • Canadian Journal of Plant Pathology, July 2013, Taylor & Francis

    Professor Mary Ruth McDonald

  63. Long-term Yield of Horticultural Crops in Wisconsin in Relation to Seasonal Climate in Comparison with Southern Ontario, Canada

    Article • HortScience, July 2013, American Society for Horticultural Science

    Professor Mary Ruth McDonald

  64. Cytology of infection, development and expression of resistance toPlasmodiophora brassicaein canola

    Article • Annals of Applied Biology, June 2013, Wiley

    Professor Mary Ruth McDonald

  65. Reaction of Lines of the Rapid Cycling Brassica Collection and Arabidopsis thaliana to Four Pathotypes of Plasmodiophora brassicae

    Article • Plant Disease, June 2013, Scientific Societies

    Professor Mary Ruth McDonald

  66. A comparison of clubroot development and management on canola and Brassica vegetables

    Article • Canadian Journal of Plant Pathology, April 2013, Taylor & Francis

    Professor Mary Ruth McDonald

  67. Evidence that the Biofungicide Serenade (Bacillus subtilis) Suppresses Clubroot on Canola via Antibiosis and Induced Host Resistance

    Article • Phytopathology, March 2013, Scientific Societies

    Professor Mary Ruth McDonald

  68. Using crop canopy modification to manage plant diseases

    Article • European Journal of Plant Pathology, January 2013, Springer Science + Business Media

    Professor Mary Ruth McDonald

  69. Effect of seeding date on development of clubroot in short-season Brassica crops

    Article • Canadian Journal of Plant Pathology, October 2012, Taylor & Francis

    Professor Mary Ruth McDonald

  70. Effect of Host Resistance and Fungicide Application on Clubroot Pathotype 6 in Green Cabbage and Napa Cabbage

    Article • HortTechnology, June 2012, American Society for Horticultural Science

    Professor Mary Ruth McDonald

  71. Influence of cultivar and year on phytochemical and antioxidant activity of potato (Solanum tuberosumL.) in Ontario

    Article • Canadian Journal of Plant Science, May 2012, Canadian Science Publishing

    Professor Mary Ruth McDonald

  72. Infection and development ofPlasmodiophora brassicaein resistant and susceptible canola cultivars

    Article • Canadian Journal of Plant Pathology, April 2012, Taylor & Francis

    Professor Mary Ruth McDonald

  73. Reaction to Plasmodiophora brassicae Pathotype 6 in Lines of Brassica Vegetables, Wisconsin Fast Plants, and Canola

    Article • HortScience, March 2012, American Society for Horticultural Science

    Professor Mary Ruth McDonald

  74. Effect of Temperature on Cortical Infection by Plasmodiophora brassicae and Clubroot Severity

    Article • Phytopathology, December 2011, Scientific Societies

    Professor Mary Ruth McDonald

  75. Mechanisms of the biofungicide Serenade (Bacillus subtilisQST713) in suppressing clubroot

    Article • Biocontrol Science and Technology, November 2011, Taylor & Francis

    Professor Mary Ruth McDonald

  76. Temperatures below 17 C slow and stop the development of clubroot

    Article • Plant Pathology, October 2011, Wiley

    Professor Mary Ruth McDonald

  77. Boron reduces development of clubroot in canola

    Article • Canadian Journal of Plant Pathology, October 2011, Taylor & Francis

    Professor Mary Ruth McDonald

  78. Management of Botrytis Leaf Blight of Onion: The Québec Experience of 20 Years of Continual Improvement

    Article • Plant Disease, May 2011, Scientific Societies

    Professor Mary Ruth McDonald

  79. Development and validation of a disease forecast model for Sclerotinia rot of carrot

    Article • Canadian Journal of Plant Pathology, April 2011, Taylor & Francis

    Professor Mary Ruth McDonald

  80. Effect of temperature on primary infection by Plasmodiophora brassicae and initiation of clubroot symptoms

    Article • Plant Pathology, April 2011, Wiley

    Professor Mary Ruth McDonald

  81. Potential biological control of clubroot on canola and crucifer vegetable crops

    Article • Plant Pathology, December 2010, Wiley

    Professor Mary Ruth McDonald

  82. Significance of seed infection on epidemics of mycosphaerella blight in field pea

    Article • Canadian Journal of Plant Pathology, November 2010, Taylor & Francis

    Professor Mary Ruth McDonald

  83. Consistency of long-term marketable yield of carrot and onion cultivars in muck (organic) soil in relation to seasonal weather

    Article • Canadian Journal of Plant Science, September 2010, Canadian Science Publishing

    Professor Mary Ruth McDonald

  84. Improving spray retention to enhance the efficacy of foliar-applied disease- and pest-management products in field and row crops

    Article • Canadian Journal of Plant Pathology, December 2008, Taylor & Francis

    Professor Mary Ruth McDonald

  85. Effects ofGlomus intraradicesand onion cultivar onAlliumwhite rot development in organic soils in Ontario

    Article • Canadian Journal of Plant Pathology, December 2008, Taylor & Francis

    Professor Mary Ruth McDonald

  86. Relationship Between Nitrogen Fertilization and Cercospora Leaf Spot and Alternaria Leaf Blight of Carrot

    Article • HortScience, August 2008, American Society for Horticultural Science

    Professor Mary Ruth McDonald

  87. Temperature Prior to Harvest Influences the Incidence and Severity of Clubroot on Two Asian Brassica Vegetables

    Article • HortScience, August 2008, American Society for Horticultural Science

    Professor Mary Ruth McDonald

  88. Disease progression of Sclerotinia rot of carrot, caused bySclerotinia sclerotiorum, from shoot to root before and after harvest

    Article • Canadian Journal of Plant Pathology, April 2008, Taylor & Francis

    Professor Mary Ruth McDonald

  89. First Report of Iris yellow spot virus on Onion in Canada

    Article • Plant Disease, February 2008, Scientific Societies

    Professor Mary Ruth McDonald

  90. ONION SEED TREATMENT AND COATING TECHNOLOGIES

    Article • Acta Horticulturae, February 2008, International Society for Horticultural Science (ISHS)

    Professor Mary Ruth McDonald

  91. Effect of Foliar Trimming and Fungicides on Apothecial Number of Sclerotinia sclerotiorum , Leaf Blight Severity, Yield, and Canopy Microclimate in Carrot

    Article • Plant Disease, January 2008, Scientific Societies

    Professor Mary Ruth McDonald

  92. Evaluation of disease forecasting programs for management of septoria late blight (Septoria apiicola) on celery

    Article • Canadian Journal of Plant Pathology, December 2007, Taylor & Francis

    Professor Mary Ruth McDonald

  93. S-Alk(en)yl- l-cysteine Sulfoxides and Relative Pungency Measurements of Photosynthetic and Nonphotosynthetic Tissues of Allium porrum

    Article • Journal of Agricultural and Food Chemistry, September 2007, American Chemical Society (ACS)

    Professor Mary Ruth McDonald

  94. Nitrogen utilization timeline of carrot over the growing season

    Article • Canadian Journal of Plant Science, July 2007, Canadian Science Publishing

    Professor Mary Ruth McDonald

  95. Establishment of Critical Sap and Soil Nitrate Concentrations using a Cardy Nitrate Meter for Two Carrot Cultivars Grown on Organic and Mineral Soil

    Article • Communications in Soil Science and Plant Analysis, July 2007, Taylor & Francis

    Professor Mary Ruth McDonald

  96. Field evaluation of weather-based spray programs for the control of downy mildew of lettuce (Lactuca sativa), caused byBremia lactucae, in Quebec and Ontario

    Article • Canadian Journal of Plant Pathology, March 2007, Taylor & Francis

    Professor Mary Ruth McDonald

  97. Impact of high air temperatures on Brassicacae crops in southern Ontario

    Article • Canadian Journal of Plant Science, October 2006, Canadian Science Publishing

    Professor Mary Ruth McDonald

  98. Distribution of nitrogen uptake, fibrous roots and nitrogen in the soil profile for fresh-market and processing carrot cultivars

    Article • Canadian Journal of Plant Science, October 2006, Canadian Science Publishing

    Professor Mary Ruth McDonald

  99. Seasonal Nitrogen Partitioning and Nitrogen Uptake of Carrots as Affected by Nitrogen Application in a Mineral and an Organic Soil

    Article • HortScience, August 2006, American Society for Horticultural Science

    Professor Mary Ruth McDonald

  100. Long-term climate and weather patterns in relation to crop yield: a minireview

    Article • Canadian Journal of Botany, July 2006, Canadian Science Publishing

    Professor Mary Ruth McDonald

  101. Advances in conventional methods of disease management

    Article • Canadian Journal of Plant Pathology, March 2006, Taylor & Francis

    Professor Mary Ruth McDonald

  102. Carrot Yield, Quality, and Storability in Relation to Preplant and Residual Nitrogen on Mineral and Organic Soils

    Article • HortTechnology, January 2006, American Society for Horticultural Science

    Professor Mary Ruth McDonald

  103. Occurrence of fungal pathogens of carrots on wooden boxes used for storage

    Article • Plant Pathology, October 2005, Wiley

    Professor Mary Ruth McDonald

  104. Overwintering Ability ofLiriomyza huidobrensis(Blanchard) (Diptera: Agromyzidae) in Southern Ontario, Canada

    Article • Environmental Entomology, August 2005, Oxford University Press (OUP)

    Professor Mary Ruth McDonald

  105. Lateral Clipping of Canopy Influences the Microclimate and Development of Apothecia ofSclerotinia sclerotiorumin Carrots

    Article • Plant Disease, June 2005, Scientific Societies

    Professor Mary Ruth McDonald

  106. Epidemiology of sclerotinia rot of carrot caused bySclerotinia sclerotiorum

    Article • Canadian Journal of Plant Pathology, June 2005, Taylor & Francis

    Professor Mary Ruth McDonald

  107. Long-term marketable yields of horticultural crops in southern Ontario in relation to seasonal climate

    Article • Canadian Journal of Plant Science, April 2005, Canadian Science Publishing

    Professor Mary Ruth McDonald

  108. Forecasting diseases caused bySclerotiniaspp. in eastern Canada: fact or fiction?

    Article • Canadian Journal of Plant Pathology, December 2004, Taylor & Francis

    Professor Mary Ruth McDonald

  109. Crop Diversification In Ontario: Adaptation of Annual Globe Artichokes

    Article • HortScience, July 2004, American Society for Horticultural Science

    Professor Mary Ruth McDonald

  110. Crop Diversification in Ontario: Adaptation of Chives

    Article • HortScience, July 2004, American Society for Horticultural Science

    Professor Mary Ruth McDonald

  111. Effect of Nitrogen Rate and Residual Soil Nitrogen on Yield and Quality of Carrots

    Article • HortScience, July 2004, American Society for Horticultural Science

    Professor Mary Ruth McDonald

  112. COOL SEASON CROP PRODUCTION TRENDS: A POSSIBLE SIGNAL FOR GLOBAL WARMING

    Article • Acta Horticulturae, June 2004, International Society for Horticultural Science (ISHS)

    Professor Mary Ruth McDonald

  113. EFFICACY TESTING OF ONION SEED TREATMENTS IN THE GREENHOUSE AND FIELD

    Article • Acta Horticulturae, March 2004, International Society for Horticultural Science (ISHS)

    Professor Mary Ruth McDonald

  114. LEAF PHOTOSYNTHESIS AND TRANSPIRATION OF TWO LEEK CULTIVARS WITH DIFFERING PSEUDOSTEM PUNGENCY LEVELS

    Article • Acta Horticulturae, March 2004, International Society for Horticultural Science (ISHS)

    Professor Mary Ruth McDonald

  115. MANAGEMENT OF CLUBROOT OF ASIAN BRASSICA CROPS GROWN ON ORGANIC SOILS

    Article • Acta Horticulturae, March 2004, International Society for Horticultural Science (ISHS)

    Professor Mary Ruth McDonald

  116. Management of Diseases of Onions and Garlic

    Article • January 2004, Springer Science + Business Media

    Professor Mary Ruth McDonald

  117. Assessment of Chlorophyll and Nitrate Meters as Field Tissue Nitrogen Tests for Cabbage, Onions, and Carrots

    Article • HortTechnology, January 2004, American Society for Horticultural Science

    Professor Mary Ruth McDonald

  118. CHLOROPHYLL AND NITRATE METERS AS NITROGEN MONITORING TOOLS FOR SELECTED VEGETABLES IN SOUTHERN ONTARIO

    Article • Acta Horticulturae, October 2003, International Society for Horticultural Science (ISHS)

    Professor Mary Ruth McDonald

  119. How Well Do Critical Nitrogen Concentrations Work for Cabbage, Carrot, and Onion Crops?

    Article • HortScience, October 2003, American Society for Horticultural Science

    Professor Mary Ruth McDonald

  120. OPTIMUM NITROGEN FERTILIZATION OF SUMMER CABBAGE IN ONTARIO

    Article • Acta Horticulturae, October 2003, International Society for Horticultural Science (ISHS)

    Professor Mary Ruth McDonald

  121. Sclerotinia Rot of Carrot: An Example of Phenological Adaptation and Bicyclic Development bySclerotinia Sclerotiorum

    Article • Plant Disease, May 2003, Scientific Societies

    Professor Mary Ruth McDonald

  122. First Report of Foliar and Root Infection of Carrot by Sclerotinia minor in Ontario, Canada

    Article • Plant Disease, December 2002, Scientific Societies

    Professor Mary Ruth McDonald

  123. Vegetable Crop Pest Management (Plant Pathogens)

    Article • May 2002, Taylor & Francis

    Professor Mary Ruth McDonald

  124. Interactions among isolates and mycelial compatibility groups ofSclerotium cepivorumand cultivars of onion (Allum cepa)

    Article • Canadian Journal of Plant Pathology, December 2000, Taylor & Francis

    Professor Mary Ruth McDonald

  125. Race 2 of Fusarium oxysporum f. sp. apii New to Ontario

    Article • Plant Disease, January 1989, Scientific Societies

    Professor Mary Ruth McDonald

  126. Risk assessment and disease forecasting of Sclerotinia rot of carrots

    Article • Springer Science + Business Media

    Professor Mary Ruth McDonald

  127. Plasmodiophora brassicae Woronin, clubroot of crucifers (Plasmodiophoraceae).

    Article • CABI Publishing

    Professor Mary Ruth McDonald