The Department of Plant Sciences and Plant Pathology was formed in 1998 when the Departments of Plant Pathology, Biology and the plant specialists from Plant, Soil and Environmental Sciences were merged to form one department. In 2005 Entomology faculty were added from the old department of Entomology.   Currently the department is housed in Leon Johnson Hall, the Plant BioScience Building, Lewis Hall and Marsh Laboratories, located on the Bozeman campus. 

The MONT Herbarium and Montana Entomology Collection are housed in the Department, providing documentation of the region's biodiversity and support for students and researchers both locally and around the world.  Both are well equiped for systematic and taxonomic support. The Schutter Diagnostic Laboratory can be found in the Plant BioScience Building. Agriculture producers and homeowners can submit plant disease and insect samples to the Laboratory for diagnosis and control recommendations

Laboratories facilities and equipment are based on the individual needs of the research leader, which may involve research based on the latest in molecular biology, plant genetics, entomology, physiology, plant pathology or cereal chemistry.  Individual laboratories are well equipped with the equipment necessary to complete each research project. Researchers cooperate to purchase, share and maintain expensive pieces of specialized equipment or facilities such as the Electron Microscope Lab. Laboratories and offices are wired with high speed computer lines for direct access to the Internet and the World Wide Web

The Plant Growth Center (PGC) is a teaching and research facility available to the College of Agriculture staff. The current 60,000 square-foot facility, which was completed in 1987 houses 29 glasshouse rooms with 8,300 square feet of bench space - both temperature and light are micro-computer controlled.

13 walk in growth rooms where all environment variables are computer controlled. Numerous growth chambers which are used for precise control of environmental variables

Insect quarantine facilities with separate glasshouses and growth chambers

Plant pathogen isolation facilities with 4 glasshouse rooms of 320 sq. ft.

The PGC also houses the Montana Potato Improvement Lab which is responsible for providing disease free seed stock to Montana potato producers.

In addition to the PGC, a new 10.8 million dollar Agricultural Bioscience Research Facility which adjoins the PGC was completed in June of 1999