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Lacebark Elm Bark Insects: Unknown Clustering Bugs on Disease-Resistant Tree

Grey/Black Insect Clumps on Bark

Circular clusters of tiny insects on lacebark elm in Tallahassee = unknown. Tree is disease-resistant (Ulmus parvifolia). May be new pest or harmless aggregation.

Observation Advice

Monitor for leaf damage, honeydew, sooty mold.
If no canopy symptoms, likely benign.
Kathy has weeping Chinese elms—loves them.

Plant Diseases: Sapsucker Damage on Young Oak: Same Culprit, Different Tree; Assessing Elm Bark Flaking After Vine Removal; Decay Fungus in Elm After Vine Removal: Long-Term Outlook; Dutch Elm Disease Protection: Beetle-Vectored Fungus; Chinese Elm Sudden Leaf Curl and Death: Root/Soil Trauma; Lacebark Elm Sudden Browning: Trunk Injury Likely Cause; Bark Beetle Damage on Elm: Signs and Last-Resort Treatment; Lacebark Elm Leaf Holes and Transplant Adjustment; Gardenia Sticky Buds: Scale or Aphids; Elm Tree Diseases: Symptoms, Causes, and Management Strategies

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