WEED CONTROL IN ORNAMENTALS WITH GLYPHOSATE1
George F. Ryan
The herbicide glyphosate is well established as an important chemical for controlling many kinds of perennial weeds. These include Canada thistle (Cirsium arvense), field bindweed (Convolvulus arvensis), Japanese knotweed (Polygonum cuspidatum), mugwort (Artemesia vulgaris), bracken fern (Pteridium aquilinum), leafy spurge (Euphorbia esula), nutsedge (Cyperus esculentus and C. rotundus), and many perennial grasses such as quackgrass (Agropyron repens), Johnsongrass (Sorghum halapense), and Bermudagrass (Cynodon dactylon).
This report will not attempt to review in detail the great amount of work that has been done with glyphosate for weed control in ornamentals. Instead it will call attention to certain aspects that may influence successful use of this herbicide when it becomes available for use on ornamentals, and may account for some variability that is observed in weed control and crop response.
Timing of applications. To properly evaluate the effectiveness of a translocated herbicide
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