1. The translocation and metabolism of ATA-5-C14 was studied in bean plants. Entry and movement of the phytocide were rapid but so was its metabolic breakdown. Some thirteen different compounds were found to have derived label from ATA. 2. No ATA-5-C14 was detected in the terminal growth of bean plants following application of the phytocide to one primary leaf. Large quantities of radioactivity accumulated in the terminal growth, but most of this was in the form of an unknown compound designated "1." 3. Compound 1 was found to be the principal metabolic product of ATA-5-C14 in alfalfa, honeysuckle, maple, and beans. This unidentified compound may be inferred to be involved in the phytotoxic action of ATA, since ATA itself did not reach the terminal meristem, where the most drastic symptoms are usually noted following foliar application. 4. Some one or more of the compounds other than compound 1 that are derived from ATA in the plant may have phytocidal activity. But this is yet to be determined.