2000-06-08_AgendaPacket - Laserfiche WebLink

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Potamogeton spp. Bushy pondweed P Najas flexillis Watermilfoil P P P P P P P Myriophyllum spp. Coontail P P P P P P P Ceratophyllum demersum Canadian waterweed P Elodea canadensis Wild celery P Vallisneria americans Ohara (Muskgrass) P P P P Ohara spp. Aquatic Plant Survey Summaries -Lake Owasso (continued) 9/48 8/55 6/81 6/84 5/90 6/90 6/91 Bladderwort P Utricularia vulgaris Stonewort P Nitella spp. Water buttercup P Ranunculus longirostris Floating-leaf species White waterlily P P P P P P Nymphaea tuberose Little white waterlily ~ P P Nymphaea tetragona Yellow waterlily P P P P P Nuphar variegatum `P' refers to presence. `*' refers to too late in the season. Surveys conducted by Ramsey County Public Works on 6/84 and 6/90. All other surveys were conducted by MN DNR field staff . No surveys have been conducted since 1991. All surveys provide information regarding the presence or absence of certain plants, but not all surveys provide information about the abundance of aquatic plants. As a result, it is possible to make inferences in reference to whether certain species have changed, but it is not possible to comment regarding whether overall abundances, densities or areal coverage has changed. Thus, it appears that some of the native pondweeds have disappeared during the 1980s. Eurasian watermilfoil bas not been identified in Lake Owasso. Aquatic Plant Management & Control The Lake Owasso Association has coordinated an aquatic plant control program for decades. In recent years, their control effort has totaled about 48 to 54 acres treated with herbicides to control rooted plants. The Lake Owasso Association is one of a few lakes in the metro area that are allowed to control nuisance aquatic plants in areas exceeding 15% of the lake's littoral area. Fish