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Studies & Degrees in Plant Pathology

Plant pathology, also called phytopathology, is the science of plant disease. The Department of Plant Pathology of the University of Wisconsin-Madison defines it as the study of plants and their pathogens, the process of disease, and how plant health and disease are influenced by factors such as the weather, non-pathogenic microorganisms and plant nutrition. Students learn to recognise and diagnose diseases caused by fungi, bacteria, viruses and nematodes, to understand how an epidemic develops in a field or forest, and to prevent or control it.

The subject has a direct link to food supply. According to the Food and Agriculture Organization of the United Nations (FAO), plants make up 80 percent of the food we eat, and pests and diseases destroy from 20 to 40 percent of food crops every year.

What students learn

Plant pathology combines basic biology with applied agricultural science. The Wisconsin department describes a range of knowledge that reaches from ecology to microbiology, from meteorology to applied mathematics, and from molecular biology to communication skills. A typical programme includes:

  • botany, plant physiology and genetics
  • microbiology and mycology (the study of fungi)
  • plant-microbe interactions and disease resistance
  • diagnosis in the laboratory and in the field
  • epidemiology and statistics
  • disease management: resistant varieties, crop rotation, biological control and the responsible use of plant protection products

Qualifications and levels

  • Bachelor's degree. Few universities offer a first degree called Plant Pathology. The University of Wisconsin-Madison is one of them: its department, founded in 1910, offers undergraduate, MS and PhD degrees, and its bachelor's students take classes on the economics of plant disease, fungi, organic agriculture and global food security. Elsewhere, students usually take a bachelor's degree in biology, plant science, agronomy or agricultural engineering and choose plant pathology courses within it. At McGill University in Montreal, for example, Plant Science courses are part of the Bachelor of Science in Agricultural and Environmental Science and are taught on the Macdonald Campus.
  • Master's degree. This is the usual level for specialisation. At Wisconsin the MS can be a final degree or a step towards the PhD. McGill's MSc and PhD programmes in Plant Science are research-based.
  • Doctorate. Research and university posts require a PhD. Wisconsin states that its PhD normally takes 5 to 6 years.
  • Spain. There is no bachelor's degree (grado) with this name. Plant health is taught within agricultural engineering degrees of 240 ECTS credits: the ministerial order for degrees that give access to the profession of Ingeniero Técnico Agrícola requires content on the protection of crops against pests and diseases. Specialisation follows in a master's degree of 60, 90 or 120 ECTS credits.

Where to study

SpainExchange lists 10 active schools for plant pathology: 6 in the United States, 3 in Spain and 1 in Canada. Teaching in the United States and Canada is in English. International students are common at graduate level: the Wisconsin department reports that its graduates come from over 40 countries.

In Spain, the Universitat Politècnica de Catalunya (UPC) teaches agronomic science engineering at its Escola d'Enginyeria Agroalimentària i de Biosistemes de Barcelona. Spanish public universities teach in Spanish and, in Catalonia, also in Catalan; ask the school about the language of each course.

When comparing programmes, look at the research groups and the crops they work on, whether the department runs a diagnostic clinic, greenhouses or an experimental farm, and what funding is available for graduate students.

Careers

Plant pathologists work as researchers at universities and public institutes, as diagnosticians in plant health laboratories, as crop advisers and extension officers, in plant breeding and seed companies, in companies that develop plant protection products and biological control, and in government plant health and quarantine services.

The U.S. Bureau of Labor Statistics includes them among agricultural and food scientists. It states that these scientists typically need at least a bachelor's degree and that employers may prefer or require a master's or doctoral degree. It counted 19,900 soil and plant scientists in the United States in 2025 and projects employment of agricultural and food scientists to grow 6 percent from 2025 to 2035.

Frequently asked questions

What is the difference between plant pathology and botany?

Botany studies plants in general. Plant pathology focuses on plant diseases: the organisms that cause them, how they spread and how to manage them.

Do I need a PhD to work as a plant pathologist?

Not always. According to the U.S. Bureau of Labor Statistics, agricultural and food scientists typically need at least a bachelor's degree, but employers may prefer or require a master's or doctoral degree. Research posts normally require a doctorate.

Can I study plant pathology in Spain?

Not as a bachelor's degree with that name. Crop protection is part of agricultural engineering degrees, and students specialise afterwards with a master's degree or a doctorate.

How long does a PhD in plant pathology take?

It depends on the university. The University of Wisconsin-Madison states that its PhD normally takes 5 to 6 years.