Beech Leaf Disease (BLD)

When will I see symptoms? BLD shows up in late spring, around May or June, when leaves open, and symptoms last until leaves drop in fall. Symptoms get worse each year as more leaves are damaged by nematodes overwintering in the buds, and the tree becomes more stressed. As beech trees decline, they may become vulnerable to other problems, like root rot, canker fungi, and insects.

How do I know for sure it's BLD? Several other pests and diseases look similar. An ISA certified arborist can help you tell them apart — find one on the Trees are Good website.

Early symptoms to look for:

• Dark stripes or bands between the leaf veins
• Easiest to spot when looking up into the canopy

Later symptoms:

• Leaves may curl, pucker, or develop a leathery texture and irregular edges
• Yellow or brown leaves
• Canopy dieback, with the tree progressively losing leaves and branches

Don't confuse BLD with these look-alikes:

• Leaf curling aphids: leaves curl or roll at the edges and look yellow or faded between the veins
• Woolly beech aphid: fluffy white patches on the underside of leaves
• Beech erineum mite: patches on the top of the leaf that start light green, then turn orange and eventually brown
• Anthracnose: small brown or black spots that develop into dead patches; new leaves may curl

Should I remove my beech tree now, just in case? We don't recommend removing a live, healthy tree as a precaution for BLD. Infected trees can often survive for years without treatment, depending on their overall health. If you do decide to remove your beech tree, check the city's tree removal permit requirements first.

How can I slow decline in an untreated tree?

• Water it regularly, especially during drought
• Avoid extra stress: be careful not to over prune, and keep landscaping equipment and foot traffic away from the roots and trunk to prevent injury
• Add a 'donut' of mulch around the roots in a ring, without piling against the trunk
• Leave fallen leaves where they are — raking won't stop the spread of BLD and takes away nutrients

Can I protect my beech tree? There's no cure for BLD, but treatments can help prevent and significantly reduce symptoms in landscape trees. We recommend hiring an ISA certified arborist who also holds a VDACS pesticide applicator license to diagnose and treat your tree. Any pesticide used to treat BLD must be applied according to its product label under state law.

Comparing your treatment options

Is there a way to treat forested areas? There's currently no effective forest-scale treatment for BLD, so a significant loss of American beech trees is expected in forests across its range. Management options for beech forests include:

• Monitoring the spread of BLD and tracking the health of symptomatic trees
• Removing dead or dying beech trees that are hazardous to the public
• Treating individual high-value specimen trees
• Preparing forests for succession by managing invasive plants, planting young trees beneath declining beech stands, and using deer fencing to protect saplings in the understory
• Identifying beech trees with genetic resistance to BLD

How can you help?

• Stay on marked trails — going off-trail disturbs the ecosystem, spreads invasive plants, and causes soil erosion
• Remove invasive plants from your property — they can spread into parks and prevent young trees from growing into the canopy
• Don't vandalize beech trees — beech bark is thin, and injuries can make trees more vulnerable to pests and disease
• Report BLD sightings — if you spot BLD in Fairfax City, log it on iNaturalist so city staff can track it
• Tell us about resistant trees — if you notice a healthy beech surrounded by severely declining trees with BLD symptoms, it may have genetic resistance to the disease. Email the Urban Forestry Division with a photo and GPS coordinates