A procedure for the screening of antialgal substances has been described and evaluated with specific reference to microbial products. Data on the extracellular materials of 545 actinomycete and fungal isolates showed a wide distribution of agents having algicidal activities. Of these culture filtrates, 20.4% apparently had selective antagonistic effects against particular algal groups. A more comprehensive examination revealed that metabolic products from two actinomycete cultures exhibited properties that warrant further studies on their chemical and physiological characteristics.
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Safferman et al. (1962) studied this question.