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they decay <br />elng added to <br />ter, fro* ruaoft <br />y aueh fiahes aa <br />ally bloona occur <br />1 of plankton <br />ily (uaually <br />eually copper <br />ia uaed* <br />the area to be <br />;h and thia danger <br />‘usually 5 pounda <br />ie*green algae <br />imical ahould be <br />ieept 2*5 pounda <br />justed depending <br />i other factora. <br />he water in appre- <br />the water aa <br />re usually less <br />n the morning aa . <br />it with each <br />Ily ns poaaible <br />ices for <br />i residenta on <br />{ method* To <br />1 (motora of <br />at to be used <br />of 2” X 2” <br />the boat and <br />)iece near each <br />•lap bag can be <br />t <br />>ttom will drag in <br />r its equivalent <br />a lake (this <br />ts* At the <br />d be placed in <br />he amount in the <br />istribution of <br />i' <br />t <br />(5) Space boata equipped for application about 100 feet apart and move the liiM <br />of boats in even rank over the entire area of the lake to obtain even di^ <br />tribution of chemical* Remove bags from the water when the boat ia not <br />moving* Boats should be washed carefully when the treatment is finished <br />since copper sulphate is corrosive* <br />Initial treatments by a new group first using the boat-and-burlap-bag method <br />must bo supervised by personnel of the Division of Game and Fish* <br />Effectiveness of plankton algae treatments vary with weather conditions« uni* <br />formity of application and other factors* On some lakes a single treatment per <br />season gives satisfactory nuisance control* Other lakes may require three or more <br />treatments during a sumier* Treatment of algae one year will have no suppressive <br />effect on algae the next year* In general, treatments have greatest chance for <br />success when made in clear weather with light wind to aid mixing of the water as pre* <br />viously stated* Early morning treatments are preferable to those made in the after­ <br />noon* It is also desirable to have a day with calm weather before treatment to allow <br />cells to float up into the upper few feet of water* Usually an entire lake <br />must be treated for effective control of plankton algae since local areas such as a <br />bay can readily become reinfected* Treating a bay or marginal area should be expected <br />to give only very temporary relief* <br />A principle precaution in treatment of plankton algaei other than application of <br />correct dosage, is to make the treat*^ent before the growth becomes extremely heavy* <br />Flan early for the treatment* If treatment is made when n heavy bloom is present, <br />decay of a large amount of dead algae may deplete oxygen in the water causing a kill <br />of fish and other aquatic animals* Do not wait to treat until there are heavy scums <br />along shore* Treat while the algao .are still dispersed throughout the water* The <br />niitsr should not be used for swimming for 24 hours niter treatment* <br />If other copper compounds or formulations are used for algnc control, these should <br />|)C applied according to directions on the label and instructions for their use provided <br />by the Minnesota Department of Natural Resources* <br />Control of filamentous Algae <br />Filamentous algae may become excessively abundant in localised shore areas and <br />form blankets, scums, or moss-like growths on rocks* localized chemical treatment^ <br />\igually give adequTte control* An effective treatment consists of three appli­ <br />cations of copper sulphate at weekly intervals at a concentration of 1*0 pound of <br />chemical per million po'inds of water or 2*7 pounds per acre-foot of water* The amount <br />of copper sulphate to be used in each situation will be specified in the permit. <br />The copper sulphate c-rfi be applied by hand scattering line crystals, by the <br />burlap bag method using large crystals, or by spraying* A spray solution is made by <br />dissolving powdered cop'-er sulphate in water* The chemical should be applied along <br />the shoreline first and then into rrogresnively deeper water so that fish will move <br />out of the area to be t/e it' '^* niter t.re .ting filum-.;ntoao algae with copper sulphate, <br />the water should not be used for swimmitir for P.'* hours. <br />Control of Muokrrasn (Ch«ai*a) <br />Muskgracses are la-ge algae that lo'-k much like other large aquatic plonts* <br />Chars, the most conmon of the muskgrasses, is a coarse bushy alga that ^owa <br />attached to the bottom* The plant may grow from 6 inches to 4 feet tall and has <br />1 <br />4 <br />■ <br />it <br />whorled bra <br />crusted wit <br />the branche. <br />(?hara <br />usual treat <br />pounda of w <br />by the boat <br />phate to be <br />sulphate, tl <br />Certain <br />controlling <br />instructions <br />the treated <br />of Natural R <br />Chemica <br />boating and <br />encroachment <br />If in d< <br />Technical Sei <br />390 Centennii