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 also 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 curl, pucker, or develop a leathery texture and irregular edges
• Leaves turn yellow, then brown
• 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? No — we don't recommend removing a live, healthy tree as a precaution. Infected trees can often survive for years without treatment, depending on their overall health. If you do decide to remove a 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 dry spells
• Avoid extra stress: skip pruning large branches, and keep mowing and foot traffic away from the base
• Add a ring of mulch around the roots, like a donut, without piling it against the trunk
• Leave fallen leaves where they are — the nematodes overwinter in the tree's buds, not in leaf litter, so raking won't stop the spread

Can I protect my beech tree? There's no cure for BLD, but treatments can help prevent or slow it 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 must be applied according to its product label — this is required by state law.

Comparing your treatment options

Is there a way to treat forested areas? Not currently. There's no effective forest-scale treatment for BLD, so a significant loss of beech trees is expected in wooded areas. Instead, the city focuses on: 

• Monitoring the spread of BLD and tracking symptomatic trees
• Removing beech trees that are dead, dying, or hazardous
• Treating high-value specimen trees individually, using an integrated approach that combines monitoring, prevention, and targeted treatment
• Preparing forests for the future by managing invasive plants, planting young trees beneath declining beech stands, and using deer fencing to protect saplings

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 crowd out our forests and prevent new trees from growing
• Don't damage beech trees — their bark is thin, and injuries make them 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 ones, it may be naturally resistant. Email the Urban Forestry Division with a photo and GPS coordinates