Washington and Lee University
OP-9: Integrated Pest Management

During November of 2008 the campus was reviewed by Van Yahres Tree Company arborists to evaluate trees and shrubs for current pest and disease problems. This information was reviewed alongside the current pest management practices and a proposal for an IPM program was submitted and approved. The overall IPM program was implemented in 2009.

Integrated Pest Management Overview:

• Boxwood Leaf Minor: Boxwood leaf minor is still active in various hot spots. Areas will be treated with a systemic that will allow for better control and reduce the potential forfuture populations. Similarily, scale can be better controlled with a combination of systemic and contact sprays.
• Anthracnose sprays on the Dogwoods and Ash may be unnecessary. Because the sprays are done as a prophylactic, the only way to determine successful treatment is to discontinue sprays. Plants will be reviewed for active disease that has the potential to threaten long term survival of the tree. If the treshold for damage is low enough, it is often possible to skip multiple sprays, or even successive seasons.
• Two Hemlocks have Adelgids, and will be treated with a trunk injection. The remaining Hemlocks are suffering from environmental stress with a few opportunistic Mites. Trees will be reviewed, but at this point sprays will not make any noteworthy change.
• The Mimosa webworm in the Locust trees will be controlled with a trunk injection. This would eliminate multiple sprays in high traffic areas and suppress the population over multiple generations.

All IPM scheduled visits include review of trees and shrubs from Lee House to Lee Chapel, including parking and front campus lawn. Spot treatments will be done for localized insect, mites or disease problems as needed in small volume, low pressure suppression sprays. Assessment and recommendations for larger pest/disease treatments will be provided as needed.