Extension > Garden > Diagnose a problem > What's wrong with my plant? > Deciduous > Viburnum > Leaves discolored yellow to pale green
Viburnum > Leaves > Leaves discolored yellow to pale green
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Two-spotted spider mite
Tetranychus urticae
- White to yellow stippling on foliage
- Heavy infestations will causer leaves to turn white, yellow and ultimately grayish bronze
- Premature leaf drop may occur
- Shake leaves over white paper or plate to detect mites- adults are dark and move slowly
- More information on Two-spotted spider mite
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Downy mildew
Plasmorpha viburni
- Leaf spots are first yellow then brown
- Spots may be angular or have feathery edges depending on species of viburnum
- Fuzzy, grayish-white areas of fungal growth may be visible on underside of blotches
- Spots may join together to form large blotches.
- Young leaves may become crinkled or distorted
- In severe cases, infected leaves may fall
- More information on Downy mildew
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Oystershell scale
Lepidosaphes ulmi
- 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
