As Baylor University suggests, teachers are in the "best position to prevent plagiarism." On their website, Baylor provides several examples exhibiting how teachers can create a learning environment that will discourage plagiarism, as well as supplying detection devices for teachers to keep in mind when assessing a student's work.
Purdue's Online Writing Lab (OWL) is a tremendously informative resource. It addresses plagiarism in a multi-faceted way, and its resources include pages that might prove beneficial for teachers.
This page "provide[s] lesson plans and handouts for teachers interested in teaching students how to understand plagiarism."
This page "provide[s] lesson plans and handouts for teachers interested in teaching students how to avoid plagiarism."
Robert Harris, in an article about anti-plagiarism strategies, thoroughly discusses plagiarism awareness, prevention, and detection. He claims that these strategies "can be used to combat what some believe is an increasing amount of plagiarism on research papers and other student writing" and that "by employing these strategies, [teachers] can help encourage students to value the assignment and to do their own work."
"Writing Across the Disciplines: Plagiarism Workshop" is a PowerPoint developed by Lori Kanitz for an Oral Roberts University Instructor Training Workshop. Why students plagiarize, how to detect and recognize the signs and sources of plagiarism, and how to build plagiarism-resistant assignments are some topics discussed throughout the PowerPoint.
The Plagiarism Spectrum identifies 10 types of plagiarism based on findings from a worldwide survey of nearly 900 secondary and higher education instructors. Each type of plagiarism has been given a digital moniker to reflect the significant role that the internet and social media play in student writing.
Hosting Facts offers an excellent illustrated guide to avoiding plagiarism, including copyright infringement.