Figure 3. Drill wounds In hybrid poplar. A, excellent uniform growth, excellent closure and compartmentalization. Notethat discoloration did not move Into the new ring that formed after wounding. B, good uniform growth, excellent closure and compartmentalization. C, good uniform growth, good closure and fair compartmentalization. D, good uniform growth, good closure, poor compartmentalization. E, excellent early growth, poor growth last 3 years, poor closure, excellent compartmentalization. F, poor uniform growth, poor closure, and good compartmentalization. G, excellent early growth, poor growth lasts 4 years, poor compartmentalization.