RT Journal Article SR Electronic T1 Bacterial Leaf Scorch of Landscape Trees: What We Know and What We Do Not Know JF Arboriculture & Urban Forestry (AUF) FD International Society of Arboriculture SP 376 OP 385 DO 10.48044/jauf.2007.043 VO 33 IS 6 A1 Sherald, James L. YR 2007 UL http://auf.isa-arbor.com/content/33/6/376.abstract AB Xylella fastidiosa has been recognized as a pathogen of landscape trees for over 25 years. Collectively, these diseases are referred to as bacterial leaf scorch (BLS). Arborists, property owners, and communities are now beginning to recognize BLS as a serious threat to the urban forest. Although advances in symptom awareness and diagnostic techniques have enabled arborists to diagnose BLS, there are many questions regarding host range, transmission, pathogeneses, disease management, and individual tree therapy that remain unanswered.