Effect of concentration on absorption and translocation of 2,4,5-T in blackberry (Rubus procerus P. J. Muell.)

Radioactive 2,4,5-T was applied to the leaves of small Rubus precerus (P. J. Muell.) plants grown in pots in the glasshouse in amounts ranging from 24 μg to 55.8 μg per leaf. The amount of 2,4,5-T absorbed and translocated was measured 6h and 24h later. The herbicide was translocated throughout the plant within 6h and the concentration in the various plant parts increased between 6h and 24h. More 2,4,5-T was absorbed at high concentrations than at low concentrations although the percentage absorbed in 24h decreased from 13% to 6% as the concentration was increased Translocation of 2,4,5-T-1-14C was variable, although the amount translocated inereased as the amount applied was increased, and was closely correlated to the amount of herbicide absorbed by the leaves.