Appendix L
Maintenance Level Guidelines
A 5% a.i. solution of glyphosate formulated for use over water applied as a foliar spray will kill reed canary grass. Two herbicidal applications may be necessary to ensure complete coverage. Herbicide applied with a wick applicator attached to a tractor affects taller stands of reed canary grass without impacting the shorter vegetation. A late mowing in mid-September, followed by the application of 5% glyphosate a.i. in October (after big bluestem is dormant) can help to control reed canary grass. Because reed canary grass productivity is reduced by shade, planting native shrubs or wetland trees in areas of chemically-treated grass may be effective. While herbicide kills reed canary grass, the seed bank may germinate and recolonize the site. Several herbicidal applications may be necessary to inhibit seed bank recolonization. After the first application of herbicide has killed living plants, disturbance of the soil can encourage seed bank germination. When this occurs, the site can again be treated with herbicide to deplete the seed bank. An alternative method involves wick application of glyphosate in the first to third weeks of June, followed by a late June to mid-July burn. This technique reduces reed canary grass cover, depletes the seed bank, and stimulates native seed banks. In non-aquatic environments, DalponTM and Trichloracetic (TCA) TM effectively treat reed canary grass when applied in late fall or early winter. Both are soil sterilizing herbicides that must be sprayed on dried foliage in a rate of 20 to 40 lbs. per acre. Aquatic systems may also be treated with DalponTM for control up to two years. DalponTM is weakly cationic and is not absorbed by substrates Purple loosestrife ( Lythrum salicaria ) Purple loosestrife is a nuisance exotic weed that is extremely invasive in wetlands. Although colorful, this plant is extremely undesirable because it prevents many desirable native wetland plants from becoming established. Flower Purple loosestrife is a perennial herb 3-7 feet tall with a dense bushy growth of 1-50 stems. Showy flowers vary from purple to magenta; possess 5-6 petals aggregated into numerous long spikes, and bloom from July to September. Leaves are opposite, nearly linear, and attached to four-sided stems without stalks. Purple loosestrife was first introduced as a garden perennial from Europe during the 1800's Infestation This plant's optimal habitat includes marshes, stream margins, flood plains, sedge meadows, and wet prairies. It is tolerant of moist soil and shallow water sites such as pastures and meadows, the way most herbicides are. http://www.dnr.wi.gov/news
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Naperville Park District | 2023 MASTER PLAN
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