Skip to content

Bacterial Leaf Scorch of Oaks 2019

It's that time of year when landscapers and homeowners bring in oak leaves and leaves from other hardwoods such as maple and elm with scorched edges, to be tested for bacterial leaf scorch. Currently, there is a $20 charge per sample for bacterial leaf scorch (BLS) testing. For BLS testing, at least 20 leaves are required and the test may take up to two weeks to run. Check payable to University of Delaware.
Due to similarity of symptoms to other environmental and cultural disorders, a confirmation diagnosis is based on detection of bacteria in plant tissue. A laboratory test necessary to detect presence of causal bacteria relies on sampling approximately 15-20 petioles of leaves. Attached leaves provide the best specimens, for leaves collected in September. A positive detection of bacteria along with dieback indicates the tree in question will survive only a few years. Severely affected trees should be removed to reduce spread to nearby trees. The bacteria that cause BLS are not harmful to humans or animals.
Checks payable to University of Delaware, $20 per sample. Please indicate on the form that BLS testing is requested.  Delaware Cooperative Extension office staff may receive plant samples in the County Offices.
NFG August 2019
Print Friendly, PDF & Email
Published on Categories Hot TopicsTags , , ,

About cmanneri

Christy is a graduate of the Biden School of Public Policy and Administration at the University of Delaware with a master's in Public Administration. She is the chief operating officer of a local non-profit, 3B Brae’s Brown Bags and a Communications Specialist for the University of Delaware. Her research interests include issues of social justice, such as nutritional insecurity, community re-entry, and domestic violence. She also volunteers with her local school district and has a deep passion for education policy, as she believes many social injustices stem from inequitable opportunities in education.