Hi Mathias, thanks for the question.

This does look like herbicide injury. A virus or disease would not affect multiple plants at the same time.  Overspray, drift, or volatilization of herbicides could very likely be the cause.  Volatilization can affect plants up to a mile away.  Recent high temperatures make volatilization more of a problem. Nearby farm fields or lawn service work can be the source. Sprayer contamination can also cause the problem. Check out the following links:

Reducing Herbicide Damage in the Landscape | Home & Garden Information Center (clemson.edu)

Herbicide Drift and Drift Related Damage (psu.edu)

Noticing herbicide drift in your garden? | UMN Extension

I hope this is helpful.