02-07-1977 Planning Packet - Laserfiche WebLink

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•. - ■•V A:: . V: r and control \1 is initiatod* ( aquatic herbi- ; offoctivo and the that a particular Ification nay not ;jpoa of planta tturea of planta at >a ooanon in Ninno« ) Ninnoaota Diriaion into aont in for towoUing* control ao that cone in contact ted during perioda area or becone so of chenicals wavs be read rding to label oid ham to per- h irrigation and d area. Re* iod of tine oating*leaved Iheae are all water because Boilst and are f control of all cide will control e growing season Bd fruit. This ■uddy water be* these conpounda, botton. itor types of season. Granular Lng. When liquid lould be added to sen using 2,4*0 or > accuaulate on ;ay of plants and »d when the ition can also rale chenical re* V4. ■J '■ i rf .'•V ■i; - .7- Liquid endothall and diquat hare been Used with sons success on duckweeds but the ability of these tiny plants to reproduce rapidly and their tendency to accumulate in layers due to wind and wave action hinder control neasures. Oudc%reeds are small elliptical plants that float on the surface of quiet waters, eifpeCially small fertile ponds, where they may completely cover the water surface. lemical control of emergent plants The most common emergent plants causing nuisance conditions in Minnesota are cattail and bulrush. Occasionally growths of broad*leaved emergents such as arrow* head and grassy plants like reed»conary grass cause nuisance conditions. Woody plants such as willow may also sometimes become abundant in damp low areas next to the shore of a lake or pond. Cattails can usually be controlled by the use of formulations of dalapon. This chemical is applied as foliar spray. Spraying should be done early in the season when the plants are ? to 3 feet tall. Any successive regrowth should be sprayed as it re* appears. Spraying is effective throughout the season and con continue until shortly before the first frost. Bulrush is extremely difficult to control chemically. There is no one herbicide that has given consistent r<*sults in Minnesota. Mechanical control by cutting and pulling has usually proven to be the best method. Because of the unique value of bulrush, few permits are granted for large scale removal on public waters. Excessive growths of emergent monocotyledonous plants (those with parallel*veined leaves, like grasses) can usually be controlled by the some chemicals used for cattails, and emergent dicotyledonous plants (those with net«veined leaves, like a dandelion) controlled by use of liquid 2,4*D. Woody plantr like willows may be sprayed with 2,4-D or ammonium sulfamate. Complete wetting of all plants with the spray solution is important for effective control of emergent plants, lifhen a water base solution is used, the addition of house* hold detergent (any of the common liquid kinds) as a wetting agent will increase the effectiveness of the herbicide. Commonly 1/4 cup of liquid detergent per 25 gallons of ^ray solution is used. There are also commercial wetting agents available. Spray drift can be minimized by directing the spray downward and VM of Imt pressure which produces large droplets. Spraying should not be done on ^ays. Illustrations of some common aquatic plants On the following pages are illustrations of some common aquatic plants occurring in Minnesota. The kinds that have the names starred are especially valuable as water* fowl food and cover plants and this should be taken into consideration when control of them is contemplated. The yellow lotus (Nelumbo lutea) is a protected wild flower and the waterlilies and pickerelweed, while not protected wild flowers, have considerable ornamental value. A ri j'v' "vd f a