https://www.gardenguides.com/12587299-spirea-diseases/
Spirea Diseases. Spirea is also known by the scientific name Spiraea japonica and is a member of the Rosaceae family. This evergreen produces lovely pink...
spireadiseases
https://www.gardeningknowhow.com/ornamental/shrubs/spirea/how-to-control-japanese-spirea.htm
Japanese spirea is a small shrub that's naturalized throughout parts of the U.S. In some areas, it is invasive. Learn how to control it here.
spireacontrolgardensstopspread