Glyphosate (Roundup PowerMax, Buccaneer, and other tradenames)
WSSA Group 9: inhibits EPSP synthase
A translocated herbicide which controls many annual and perennial weeds, both grasses and broadleaves.
For optimum control of perennial weeds such as Canada thistle, field bindweed, and quackgrass, consult labels for recommended rates and correct timing in relation to weed growth. Adding surfactant or mixing ammonium sulfate according to label may improve control of slightly stressed weeds. Apply in 20 to 60 gallons of water per acre on emerged and actively growing weeds. Glyphosate does not provide residual weed control. Do not treat when green foliage or shoots are in the spray zone. Follow all precautions on label. Repeated glyphosate applications have genetically selected for resistant biotypes of ryegrass, as well as other weed species, in the PNW. To avoid weed resistance, rotate and mix weed control practices.
At least one weed species resistant to this mode of action documented to occur in ID, OR, or WA; data from Heap, I.
The International Survey of Herbicide Resistant Weeds. Available at www.weedscience.org
Usage for glyphosate on Grapes
Post-Emergence (Weeds)
| Target | Rate of application | REI | PHI | MOA | Eff. | Notes |
|---|---|---|---|---|---|---|
| Annual Broadleaf Weeds | See product-specific label See Label | 12 | 14 | 9 | Use as a directed spray in established vineyards or for site preparation before transplanting new vines. | |
| Annual Grasses | See product-specific label See Label | 12 | 14 | 9 | Use as a directed spray in established vineyards or for site preparation before transplanting new vines. | |
| Biennial and Perennial Broadleaf Weeds | See product-specific label See Label | 12 | 14 | 9 | Use as a directed spray in established vineyards or for site preparation before transplanting new vines. | |
| Perennial Grasses | See product-specific label See Label | 12 | 14 | 9 | Use as a directed spray in established vineyards or for site preparation before transplanting new vines. |