Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Vascular occlusions and depositions associated with Pierce's disease (PD) in grapevine. (A) Bacterial aggregates in xylem of petioles. (B) Tyloses fully occluding grapevine xylem (white arrow). (C) Amorphous gels coating xylem vessel walls in PD‐infected grapevines. Photo credit: (C) Qiang Sun, University of Wisconsin, Madison, WI, USA.
