Recent Matthews laboratory publications on the subject of Pierce's Disease provide the cover images for the American Journal of Botany!
Thorne, E., B.M. Young, G.M. Young, J.F. Stevenson, J.M. Labavitch, M.A. Matthews, and T.L. Rost. The Structure of xylem vessels in grapevine and a possible passive mechanism for the systemic spread of bacterial disease. Am. J. Bot. 2006 93(4):497-504.
Sun, Q., Rost, T.L., and M.A. Matthews. Pruning-induced tylose development in stems of current-year shoots of Vitis vinifera (Vitaceae) Am. J. Bot. 2006 93(11): 1567-1576.