Plant Pathologist
A plant pathologist is a professional who specializes in plant health much as a doctor specializes in human health or a veterinarian in animal health. Keeping plants healthy requires an understanding of the organisms and agents that cause disease as well as an understanding of how plants grow and are affected by disease.
In their work, plant pathologists cooperate with plant breeders, crop managers, insect, and weed specialists in developing integrated, environmentally sound approaches to managing crops and their pests.
Working together with other specialists, plant pathologists contribute to the production of a stronger economy, safer foodstuffs, a cleaner environment, conservation of soil and water resources, and the health of workers in farms, gardens, and landscapes.
Plant pathologists and bioengineers also work closely together to develop disease-resistant plant varieties, preserving food from spoilage, developing new strains of organisms for biological control, and even in developing composting processes for solid waste disposal.
Information source: http://www.apsnet.org/careers/careers.asp