GLYPHOSATE ABSORPTION AND TRANSLOCATION IN RUST-INFECTED QUACKGRASS (ELYTRIGIA REPENS)

Puccinia coronata infection increased absorption of C-14-glyphosate in quackgrass 3 days after inoculation (DAI) when compared to 0, 6, 9, o r 12 DAI, Days after inoculation had no effect on glyphosate transloca tion out of treated leaves until 9 to 12 DAI when 89% of the absorbed C-14-glyphosate was retained within the infected leaf, In contrast, on ly 43% was retained in leaves treated at 0 DAI, In other studies, C-14 -glyphosate absorption increased linearly from 21 to 35% 12 to 96 h af ter treatment (HAT). Differences between control and rust-infected pla nts were not significant, Sixty-three percent of absorbed C-14-glyphos ate translocated out of control leaves by 96 HAT, while only 10% trans located out of rust-infected leaves, Additionally, 28 and 4% of the C- 14 absorbed was recovered from the rhizomes of control and rust-infect ed plants, respectively.