Leaf damage on rose #644298 - Ask Extension

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Leaf damage on rose #644298

Asked June 01, 2020, 1:07 PM EDT

Noticed this damage to the leaves of the rose this week. Looks like something has been feeding on the foliage. Any idea in what it is and what is best practice moving forward?

Harford County Maryland

Expert Response

The holes on the leaves are caused by rose slug sawfly larvae. Look on the undersides of the leaves for the young larvae. If the infestation is light, pick off and destroy the larvae by hand. To control heavy infestations, use horticultural oil or spray with spinosad. Target the undersides of the leaves. See our website for more information
https://extension.umd.edu/hgic/rose-slugs-shrubs

Marian

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