Swarthmore College
OP-9: Landscape Management

All of the College's land is managed to some degree, including rental housing units.

The IPM program utilizes monitoring, developing damage thresholds, utilizing cultural practices as control, reduction or elimination of plants in the collection that are prone to insects and/or diseases, and as a last resort using the least toxic pesticide if damage threshold warrants it. 1. Action thresholds are set by discussions between Director of Grounds and Arboretum Director. High visibility areas around main academic buildings are held to a higher standard than more remote outlying areas. These areas are monitored more frequently. 2.Monitoring is performed monthly on a rotating basis in most high priority areas and less often in lower priority areas. Our goal is to increase the frequency. Staff are always looking during normal gardening activities. We also use phenological and growing degree day information gathered from years of record keeping to help pinpoint pest life cycles. It is very important to know the difference between a pest and a beneficial. 3. We first try to use best cultural practices to encourage healthy pest resistant plants. Proper selection, siting, planting, and maintenance can prevent many problems or reduce their impact. 4.Monitoring and understanding the life cycle of a pest, can help us chose the control method with the least environmental impact. Mechanical, biological, or environmentally sensitive pesticides can usually be used if a problem is caught early.

The organic areas rely on improving soil health, proper selection of appropriate plants, the use of compost and compost tea, application of organic fertilizers if needed.

The Scott Arboretum has adopted a proactive approach to treating invasive or potentially invasive plants in our collections. Consistent with Federal Executive Order #13112 we apply the following to evaluate plants for acquisition and deaccessioning: * Prevent the introduction of invasive species * Detect and control such species * Monitor invasive species * Educate the public on invasive species The Arboretum's collections are managed so that plants not appropriate to conditions in this area are eliminated from the collection. This includes invasive exotic plants, plants are are very susceptible to insects and diseases. The collections includes many plants that have existed on site for many years, including a number of trees over 100 years old. While not used exclusively, native plants play a major role in the campus landscape.

Storm water management is part of the official Sustainability Framework document developed by the College which dictates high standards of design and site work. The Framework adopted storm water control measures that are higher than what is required by the local Planning Commission. There are numerous underground storm water infiltration systems, a biostream rain garden, landscaped infiltration beds, use of porous paving, 5 green roofs. Restoration efforts are progressing for the Crum Creek and woods for stream bank restoration/protection and restoration of woods areas impacted by construction on utility rights of ways.

All of lawn cuttings and green waste is composted on-site at Swarthmore College. The only materials that are hauled from campus and not included in the compost is diseased plant and tree material.

Any new building project utilizes landscape architects who must adhere to the College's Sustainability Framework for energy conservation and storm water management.

The Arboretum's collections are developed to use the most insect and disease resistant plants suited to this area that are possible. Adoption of the IPM program in 1990, participation in plant phenology research to predict insect emergence, and the establishment of 5 green roofs helped propel Swarthmore College to a leadership role in Grounds maintenance sustainability. Grounds employees founded and participate in a regional Landscape Management Forum of grounds directors who attempt to utilize sustainable processes in grounds management.

Jeff Jabco, Director of Grounds, Coordinator of Horticulture, Scott Arboretum (610) 328-8294 jjabco1@swarthmore.edu