rose damage #407092 - Ask Extension

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rose damage #407092

Asked June 14, 2017, 3:02 PM EDT

What is the cause of the damage to these roses?

Prince George's County Maryland

Expert Response

This is the work of the larvae of the rose slug sawfly.
They start out by 'windowpaning' the leaf by scraping the surface, making tan marks. Over time or under heavy insect pressure, the centers fall out or the whole leaf disappears.
Here is a page about them:
https://extension.umd.edu/hgic/rose-slugs-shrubs

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