On the undersides the spots are yellowish brown. As the spots run together the leaves look scorched, ragged and shotholed. The last stage of the disease is defoliation. Destroy all fallen and spotted leaves. The disease is caused by Septoria veronicae and no chemical control is listed.
Powdery mildew causes a white powdery growth on the leaves.
The disease can be controlled with benomyl or sulfur. This information is for educational purposes only. References to commercial products or trade names does not imply endorsement by MSU Extension or bias against those not mentioned. This information becomes public property upon publication and may be printed verbatim with credit to MSU Extension. Reprinting cannot be used to endorse or advertise a commercial product or company.