Examined was the possibility of interaction between morphactins and herbicides in phytotoxicity towards Spirodela as a test plant.Three newly here synthesized 9-amine-9-fluorenephosphonic acid derivatives and the following herbicides were used: Aresin, Banvell D4-S, Gesagard, Pielik, Sys 67-Prop and U-46 KV Pulver.Synergism in phytotoxicity to Spirodela was found in the case of joint application of morphactin no.
1 telemarkskongen flue and herbicides U-46 KV Pulver, Pielik and Sys 67-Prop.