Spots on Rose of Sharon

Asked May 18, 2019, 2:28 PM EDT

We've had this Rose of Sharon for 30 + years. This year the leaves and stems are covered with white spots. Would appreciate help. Thank you.

Atlantic County New Jersey rose of sharon

1 Response

Hello,

Although it would be nice to see a closer picture, I believe this is one of the cottony scale insects, maybe a Pulvinaria scale. They are soft bodied, with eggs under that cottony covering. Eggs will be hatching soon. You can wash with insecticidal soap and a strong stream of water from the hose, treat with horticultural oil, or call a landscape professional to treat. I suggest pruning the shrub before you treat, because there will be less in the way of branches and leaves to treat. It will stress the shrub but not kill it and may be worse one year than the next.

Thank you for contacting Cooperative Extension.
Nancy