Cytospora canker on an apple.  Photo provided by:  William Jacobi, Colorado State University, Bugwood.org

Cytospora canker on a willow twig.  Photo provided by:  William Jacobi, Colorado State University, Bugwood.org

Tobacco Rattle Virus on Hosta leaf.  Photo provided by:  Alan Windham, University of Tennessee, Bugwood.org

Tobacco Rattle Virus on Peony.  Photo provided by:  R.K. Jones, North Carolina State University, Bugwood.org

Tobacco Rattle Virus on Hosta.  Photo provided by:  Alan Windham, University of Tennessee, Bugwood.org

Tobacco rattle virus on epemedium.  Photo provided by:  Bob Mulrooney, University of Delaware, Plant Pathology Extension Specialist