I have several Otto Luyken that are being consumed by what I assumed were insects. I have sprayed with pesticide with no success. The leaves have multiple small circles eaten out of them. The problem started on a few but is quickly spreading to others. This problem has not stopped new growth on the shrub, but has kept the shrub from growing in over all size. The shrubs receive afternoon into evening sun and are watered on a regular basis. Any help would be greatly appreciated. DJJ