Viburnum > Stems/branches > Dead or dying branches
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Viburnum clearwing borer
- Plants may be wilted
- Stems may dieback or have sparse foliage with a few leaves at tip
- Lower part of stems are gnarled and scarred with sawdust
- Pupal cases may be found sticking out of holes in bark in spring
- Entire bush may die
- Adult borers have ½ inch bluish black bodies with yellow markings and a ¾ inch wingspan – wings are clear
- More information on Viburnum clearwing borer...
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- Leaves on one or more branches wilt, die and turn brown
- Cankers are sunken, dark colored areas on branches
- Fungal fruiting bodies give canker area a rough or pimpled appearance
- Infected young shoots turn dark brown and curl over in a shepherd's crook
- More information on Botryosphaeria canker...
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- Leaves on one to several branches turn red to yellow, wilt, die and fall off
- Depending on the stage of infection, dark streaks are often visible in sapwood if the bark is peeled back
- Symptoms may develop over a single growing season or over several years
- For management information see Verticillium wilt...
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Armillaria Root Rot
- Leaves may be small, pale green to yellow with dark green veins
- When severe, leaf edges turn brown leaves wilt and the branch dies
- No symptoms on branches
- Flat white sheets of fungal mycelia can be seen under the bark on roots or at the base of the plant
- Clusters of honey-colored mushrooms may grow at the base of the shrub in the fall
- More information on Armillaria Root Rot...
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- Light infestations do not exhibit obvious symptoms
- Severe infestations can cause chlorotic, stunted foliage
- Dieback and cracked bark can result from heavy infestations
- Light to dark brown, elongated, 1/10 to 1/8 inch long oyster-shell shaped scales found on bark.
- More information on Oystershell scale...