Content tagged with "tree health"

Updated in March 2014, this two-color, illustrated publication answers frequently asked questions about thousand cankers disease, which has not yet been found in Missouri.

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Thousand Cankers Disease

Because thousand cankers disease (TCD) kills black walnut trees, it poses a serious threat to Missouri’s important black walnut industry. Learn to ID and report early symptoms and signs.

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This two-page, full-color brochure helps you identify thousand cankers disease of black walnuts and stop its spread.  

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Photo of tree-branch flagging

Tree-Branch Flagging

Insects, diseases or weather-related injury can cause branches to break and droop. Learn how to identify the causes and what you can do to treat it.

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Oak tree

Troubled Trees

This content is archived
Diagnosing and managing urban tree stress

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Twig Girdler Cuts

These twigs show evidence of twig girdlers. To deposit her eggs, the adult female first chews a V-shaped groove around a twig, girdling it, and then inserts eggs in the bark toward the end of the branch. Winds eventually break twigs at the cut.

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Photo shows twig cut by twig pruner larvae

Twig Pruners Damage

Among twig pruners, it is the larvae that make the most damaging cut. Twig pruner female adults deposit eggs near a twig tip, and larvae tunnel inside the branch toward its base. When larvae are full-grown, they cut through all the wood at one place inside the twig, leaving only the outer bark intact. The branch eventually breaks at that point.

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Photo shows variegated Kermes scales on red oak twig

Variegated Kermes Scales

Kermes scales, a sphere-shaped insect pest of oaks, look different depending on the host. These smooth-surfaced, variegated specimens are attacking a red oak.

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When the Ice Storm Is Over: Damaged Trees

Hope if you’re reading this during Missouri’s current ice storm that your electricity stays on to keep you safe and warm…

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