Effects of selected herbicides and plant hormones on Prototheca wickerhamii. 
Prototheca wickerhamii was treated in vitro with 11 different herbicides and plant hormones.  Growth was inhibited by indolyl-3-acetic acid, indolyl-3-butyric acid and indolyl-3-propionic acid at 400 mug per ml.  Coconut milk was stimulatory.