Plant Pathology provides training and skills for a broad range of discplines in the agricultural, biological and environmental sciences.  Here is a sampling of areas or jobs where plant pathology training are important:

Agriculture and Horticulture

Jobs related to crop production, management, scouting and advising
Agribusiness management, consulting, economics
Integrated pest management - consulting and sales; research
Regulatory agencies such as the USDA, EPA, FDA, State Departments of Agriculture and others (including jobs in crop/food inspection, monitoring of pests and disease, bioterrorism, food safety, policy)
Horticultural and landscape industry
Ornamentals and floriculture industry
Park/golf course management
Gardens and arboretums
Industry or commodity associations that direct research, education, policy development, legislative issues
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Environmental Sciences

US Forest Service and state and local agencies involved stewardship of our natural lands
Research, education, communications, policy development, legislative issues
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Research

Labs in colleges and universities; government agencies such as the USDA, FDA, EPA, Fish and Wildlife, Forestry Service
Labs in private industry, including chemical, seed, and biotech companies
Biology of plant disease and plant-microbe interactions, disease resistance
Applied research in pest and disease management methods
Development of chemical and biological control products
Some students go on to graduate studies in plant pathology and pursue careers in universities, research agencies or private industry
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Education, Extension and Outreach

Teaching, at all levels, in the agricultural, biological and/or environmental sciences
Extension outreach to provide educational tools and resources for industry and clientele for both industry and homeowners
Extracurricular activities such as 4-H, Future Farmers of America, science clubs
Educational outreach programs at public gardens and parks, wildlife and nature preserves, science and discovery centers, museums, etc.
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What is the average annual salary I may expect as an entry-level graduate in Plant Health Management?
$25,000-$45,000
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Check out CFAES Hire-A-Buckeye Career Site

http://cfaes.osu.edu/current-students/launch-your-career/

Check out a great career site from the USDA and Purdue University:
http://www.agriculture.purdue.edu/USDA/careers/plantpathologist.html