Translocation of foliar-applied imazosulfuron in purple nutsedge (Cyperus rotundus L.)

The translocation of imazosulfuron in purple nutsedge was estimated using 14C-labeled compound. After having planted a tuber in a pot, a few plants (mother plants) emerged and grew forming their daughter plants. Following [14C] imazosulfuron treatment to a leaf blade of one of mother plants, about 60% of absorbed 14C compound remained in the treated site 5 days after treatment (DAT), and the rest translocated in the directions of tip and base of the treated leaf. From the results of radioactivity measurement at 5DAT and autoradiography at 12DAT, it was found that 14C accumulated in the basal bulb of the treated mother plant and the planted tuber. Moreover, 14C appeared to translocate through rhizomes, and accumulated in basal bulbs of daughter plants. Autoradiographic evidence also showed that 14C translocated to part of the roots, and to the basal bulb and part of the shoot of another mother plant which was relatively young at the time of the treatment.