We have a question regarding our climbing roses. The leaves are turning white...

Asked June 29, 2015, 11:44 PM EDT

We have a question regarding our climbing roses. The leaves are turning white and we're wondering if our roses are infected with a virus or something else? We looked at photos on-line and nothing looked like what is happening to our roses.

Ramsey County Minnesota

1 Response

This looks like damage from rose slugs, the larval stage of the rose sawfly. Probably they've already dropped off, so there is nothing to do now. But be prepared for them next year. Insecticidal soap is a low impact pesticide. Here are references:
http://www.missouribotanicalgarden.org/gardens-gardening/your-garden/help-for-the-home-gardener/advi...
http://www.ipm.iastate.edu/ipm/info/insects/wasps/rose-sawfly-roseslug