over copper sulfate crystals held near the top of the drum by a 

 bag or basket. Water with the dissolved copper sulfate is picked 

 up by means of a connection with the suction line to the pump. 

 Valves on both lines permit regulation of both intake of water 

 from the lake and volume of flow from the copper sulfate reservoir. 

 Spraying is done with a smooth fire hose (3/4" I.D., pressure) and 

 3/8" (I.D.) nozzle. 



Because of the highly corrosive nature of copper sulfate, 

 .pumps and fittings with non-corrosive parts should be used. These 

 have stainless steel or brass parts containing high percentages of 

 copper. The life of the equipment can be considerably prolonged 

 by thorough cleaning after each run. 



Bartsch (1954) gives the gallons of saturated copper sulfate 

 solution from the reservoir drum, required per minute to give one 

 p. p.m. in lake water to a depth of one foot, using two spray widths 

 60 and 80 feet, obtained with 3/8 or 1/2 inch openings, respectively, 

 in the fire hose nozzle. 



Table 2. --Gallons of saturated solution of copper sulfate 

 required per minute to give one p. p.m. (after 

 Bartsch, 1954) 



CONTROL OF EMERGENT AND FLOATING-LEAFED AQUATIC PLANTS 



The two kinds of plants are considered jointly, because of 

 similarity in control methods. 



Cattails, softstem bulr'ush, arrowheads, plantains, burreed, 

 willows, spikerush, alligator weed and manna grass, are some of the 

 common emergent aquatic plants which tend to form marshes about 

 the borders of ponds. They encroach upon the fish-producing areas 

 and provide unneeded shelter for them. The removal of fish by 

 draining or seining is also made difficult. Spikerush ( Eleocharis ) , 

 for example, may start grov/ing along the wet shores, then, after 

 the pond has been drained and left exposed for some time, spread 



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