Observations on excessive weed growth in two lakes in New Zealand

摘要: Summary Weed growth during recent years in lakes Rotorua and Rntoiti has become sufficiently abundant to threaten normal use of lacustrine facilities such as angling, boating, etc. Data referring the ecology weed are presented from results a survey made 1961. An arsenical herbicide failed control growth, possibly because low temperature lake water, or an acquired tolerance poison since high arsenic levels were found already exist plants bottom deposits lakes. The dangers trout fishery further eutrophication these arc discussed.