Abstract
Diurone—a common algicide, was used in controlling the oospore formation ofChara species. Ten ppm solution of the chemical was found effective in controlling the sperm production in case ofChara corallina within 72 h of treatment. Fifty ppm solution was toxic toChara zeylanica within 24 h of treatment. The threshold concentration (10–50 ppm) obtained did not affect the germination and vegetative growth of the rice seedlings since the transient effect was quickly reversed within a short time.
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