Russell S. Walters

• Tapholes drilled into frozen sugar maples close slowly
• Vacuum transfer system increases sugar maple sap yield
• Black cherry provenances for planting in northwestern Pennsylvania
• Conversion planting on poor hardwood sites shows promise in Ohio
• Past growth of yellow-poplar and oak reproduction key to future
• Sugar maple sap volume increases as vacuum level is increased
• Tapholes in sugar maples
• Tapholes in sugar maples: what happens in the tree
• White pine provenances for Christmas trees in eastern Kentucky & Ohio