02-07-1977 Planning Packet - Laserfiche WebLink

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-'t' nder the ility shall nts or y reason of shall be domestic or any kind, at all times, yecs shall be ury. not endorse any ween manu- have financed is denied, hereof, kd for made hereby r of )inmissioner il Resources >1 m j i. 4 ‘ 1 -TLZZZTLr •I s-i *.V^' r ' JvV * Infftmiational Leaflet 6 V .V MINNESOTA DEPAIOMENT OP NATUBAL RESOURCES nVIBOilHENT SECTION DIVISION OF FISH AMD VIIDLUZ CONTROL OF AQUATIC VEGETATION Aquatic auisaneta in Minnesota lakes nay be caused by excessive growths of rooted Aquatic plants and algae, by large numbers of snails of kinds that carry the organiaA swianer's itch or by leeches* Rooted aquatic plants are the greatest single Aource of nuisance complaints* • M •Aquatic nuisances usually can be controlled by necnoas vnav are ■aintenance of fish and wildlife populations and the protection of human health* aXl aspects of lake use must be considered by the Division* Control of aquatic nui«» sani*ve will not be approved if it is apt to be harmful to fish or wildlife populations or conflict with important lake uses and values* Types of Aquatic Vegetation Most aquatic plants, exclusive of algae, are of three general growth-forms. These are: (1) ifcihaerged plants that are usually attached to the bottom and have submerged leaves mmA stems, although some may also have leaves floating on the surface and may have flowers and^eeds borne on short stems extending above the water; (2) Floatins-leaf plants such as waterlilies which are rooted in the bottom but have most of th^r leaves floating on the surface and duckweeds which are minute plants that float on the surface; and . ^ w a (3) Urgent plants such as cattails and bulrushes which are rooted in the bottom and have leaves and stems extending out of the water* General Information There are about 150 kinds of larger plants in Minnesota that grow in water, along shores or on saturated soils* Of the aquatic plants, there are about 25 kinds that nay grow so abundantly they can interfere with ouch activities as swimming and boating* Often several unrelated kinds grow together* This complicates control, especially if a herbicide is used* There is no aquatic herbicide that is safe to use idiich will eliminate all kinds* Often a herbicide that eliminates one kind will improve conditions for growth of others* Water plants propagate by several methods* Many are long-lived perennials that grow from rootstalks in the soil* growth of rootstalks a single plant nay eventually form a large patch* Cattails, reeds, rushes, many pondweeds, water fliilfoil sad waterlilies have this kind of growth* Others, such as bushy pondweed (Najas) and wild rice are annuals that grow from seed each year* Many kinds of submerged aquatic plants grow from winter buds—really short thickened stems with many reduced leaves— that form on the plant in late summer and autumn* These fall to the bottom and grow the next spring* Canada waterweed, coontail, water milfoil, and many pondwveds, in cluding the troublesome curlyleaf pondweed, have such winter buds* Most kinds of aquatic plants also produce seeds or seed-like fruits* Often these have a hard interior portion that will pass through a duck or other water bird after it is eaten* In this way water plants are carried from lake to lake* Seeds, parts of *1 ’i I * »- * r i-‘i 1’^ . ■If 1 plants, ai tile foot I planted ii and cane, plants foj loose by % AU < native wi] the sane i C urlyleaf uabellatui from larg« are britt] As the nai margin ali Aqual growth son directly < food chaii other kin: Fish food* there are thrive in Fish shell bass and i in early i Water puri elements i plant nutx water weec water plan Water plaz oxygen and aquatic ar Frotection break the Food and e that are e are often for broodfl Esthetic v yellow lot all of whi mental as plants* 1