Changes in the translocation and distribution of 2, 4, 5-T in blackberry (Rubus procerus P. J. Muell.) with time

The distribution of 2.4,5-T in Rubus procerus P. J. Muell. was measured 24 h and 7 days after application to the leaves at 60% of the normal concentration used in the field. There was no significant difference in the amount translocated at these times. At 24 h after treatment there was a very large concentration gradient across the crown but 6 days later the concentration gradient was much smaller. It was concluded that, at the rate used, the amount of 2,4,5-T translocated to the roots was insufficient to prevent regeneration from the root system.