Rw. Wallace et Rr. Bellinder, RUST-INFECTED QUACKGRASS (ELYTRIGIA-REPENS) GROWTH AND RHIZOME BUD DEATH AFTER GLYPHOSATE APPLICATION, Weed science, 41(3), 1993, pp. 501-507
Photosynthesis decreased 32% in quackgrass infected with rust. Photoas
similate transport in rust-infected quackgrass, assessed by autoradiog
raphy, was less than that of control (no rust) leaves 35 min after exp
osure to (CO2)-C-14. Greenhouse-grown quackgrass height, foliar and rh
izome dry weights, rhizome length, and bud numbers decreased 11, 25, 2
8, 19, and 21% in rust-infected plants, respectively, compared to cont
rol plants. Foliar and rhizome biomass decreased 31 and 39%, respectiv
ely, in field-grown rust-infected plants. Rhizome bud death 48 h after
treatment (HAT) in both control and rust-infected plants increased as
glyphosate rate increased from 0.13 to 1 kg ae ha-1; however, control
plant bud death was significantly greater than that of rust-infected
plants.