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ABSTRACT
An acute 96-hours experiment, in three repetitions, with the herbicide STOMP 33 EC has been carried out with Chlorella kessleri. Toxic criteria—inhibition of the growth rate. The statistically averaged dependency of the preparation's toxicity from the concentration and time is given analytically. EC5, EC50, EC95 for 24, 48, 96h and the probable harmless concentration have been established. A lot of morphological changes such as: cell's loss color, retaining of the cell division, conjugants, to strongly injured, yellowish cells with empty content, as well as completely destroyed algal cultures at the high concentrations, were registered.