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Content tagged with "tree health"

Photo of European wood wasp larva in gallery in pine wood

European Wood Wasp Larva

The larvae of European wood wasps are creamy white, legless, with a dark spine at the hind end, and thus look very much like the larvae of our native horntail species. They have a symbiotic fungus that causes the tree tissues to deteriorate; the larvae feed on the fungus as they tunnel through the wood. Unfortunately, this process kills the tree entirely.

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Photo of fallen brown tree branch

Fallen Flagged Branch

Weakened by female periodical cicadas depositing their eggs, these brown branches fell during high winds.

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Photo shows female periodical cicada cutting slits along a tree branch

Female Cicadas Cause Branch Flagging

Female periodical cicadas make small cuts along twigs and deposit their eggs in the slits, which look like a kind of “zipper line” on the twig. Winds break the weakened twigs, and litter yards with small branches. On mature, vigorous trees, the cicada-caused wounds will heal, and branches will continue growing.

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Forest Health News

Browse up-to-date bulletins on the causes of branch flagging, insect defoliators, exotic insect and disease pests, conifer problems and current disease issues.

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Photo shows fusarium cankers

Fusarium Cankers

Fusarium cankers are elongated, larger than TCD cankers, and often visible without removing the bark.

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Leaves affected by jumping oak gall.

Jumping Oak Galls, Batman!

Missourians from St. Louis to Table Rock Lake are reporting a strange condition on the leaves of oak trees.

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Kermes Scales on Oak

Kermes scales are not your typical-looking insects. They are tan to reddish brown spheres up to 1/4-inch diameter and attach to twigs in the oak family, especially post oaks.

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Dogwood Anthracnose

MDC warns tree owners to watch for fatal dogwood disease in the St. Louis area

Dogwood anthracnose threatens the health of the cherished flowering dogwood tree.

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Oak Decline and the Future of Missouri’s Forests

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Drought, old age, insects and disease threaten state woodlands.

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