Silver Spots On Roses - Knowledgebase Question

Crownsville, MD
Avatar for CatherineSu
Question by CatherineSu
May 6, 2001
There are silver spots on the leaves of my roses...tiny rectangles. Have you any ideas what might be causing this and how I can deal with them? Thanks.

Answer from NGA
May 6, 2001
I think culprits are roseslugs. They aren't slugs at all -- they are sawfly larvae. The adults, which are wasplike, lay eggs between the leaf layers, and the larvae emerge to feed, leaving "windows" on the leaves. As they grow, they consume entire leaves. The larvae drop to the soil to pupate, and in some places there may be multiple generations during a summer.

You can help control the problem by spraying a neem-based insecticide /repellent may repel the adults. If the tiny larvae do emerge and start eating, a dose of neem should alter their appetite. Insecticidal soap is another option.

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