ground-water aquifiers. Copper sulfate and sodium arsenite are 

 the most thoroughly tested chemicals for algae control. However, 

 other newer chemicals such as dichlone (whose trade name is 

 Phygon-XL and whose technical name is 2 ,3-dichloro-l ,4-naphthoquinone) 

 and Hy anine 2389 (40 per cent methyl dodecyl benzyl trimethyl 

 ammonium chloride and 10 per cent methyl dodecyl xylene bis- 

 trimethyl ammonium chloride) have given good results under certain 

 conditions . 



Control of Algae with Dichlone 



Dichlone has sometimes given amazing results in control of both 

 blue-green algae (for which it is specific) and green algae. 

 Suggested treatments are given in Table 1. 



Table 1. --Rates of treatment with dichlone 



Rate Per acre Per 100,000 cu. Per million gal- 

 Kind of algae p .p .m. foot feet of water Ions of water 



Blue-green, bloom- 

 producing forms 0.05 2.3 ozs. 5.3 ozs. 6.4 ozs. 



Green algae, sur- 

 face scums 0.15 6.4 ozs. 1 lb . 1^ lbs. 



Bond et . al (1960) showed the 24 hours median tolerance limit 

 (TLjh) of largemouth bass to be 0.08 p. p.m. The margin of safety 

 is therefore close, and any use of dichlone should be preceded by 

 careful measurements of areas to be treated. In spite of the close 

 margin of safety, field applications have produced few fish kills. 

 The larger quantities required for treatment of surface scums is 

 most safely applied by spraying with the aid of gun and pneumatic 

 tank as illustrated in Figures 7 and 8. 



Hyamine for Algae Control 



Hyamine 2389 / alkyl (C9-C15) totyl methyl trimethyl ammonium 

 chlorid^/ is a promising algicide for use in tanks or ponds with 

 obstinate growths of algae which have not responded to copper 

 sulfate treatment, or where the latter can not be used. Swimming 

 pool operators use it instead of copper sulfate because the latter 

 may form mordants with certain clothing and hair dyes. The amount 

 recommended by the manufacturer for algae control is 0.001 per 

 cent (by weight), or 10 p. p.m. One gallon of 10 per cent solution 

 in 10,000 gallons of water will kill heavy growths of algae. 

 Estes (unpublished report JL/) , who worked with Hyamine as a fungicide, 



l_l Estes, Ray Don. 1957. The effectiveness of certain fungicides 

 on goldfish and goldfish eggs. (M.S.) 75 pp. Auburn University, 

 Alabama 



