GLYPHOSATE
Trade Names: Glyfos, Roundup, Touchdown, Vantage
Group 9
Site of Action: Inhibitors of 5-enolpyruvaylshikimimate-3-phosphate synthase (EPSP)
Symptoms
Leaves
- Arrow-shaped, puckered, upward cupped
- May be interveinal chlorosis
- Symptoms from point where herbicide contacted leaf to the end of the shoot
- Second year may be severely strapped
Shoots
- Shortened internodes
- Numerous lateral shoots resulting in bushy appearance
- Second year early shoot growth is stunted
Uptake and Translocation
- Absorbed through foliage
- Translocated throughout the plant
Persistence
- None- crops can be planted or seeded directly into treated areas following application
- Half life in field: 47 days
Often Confused With
Eutypa Dieback – trunk cankers with fruiting bodies; necrotic flecks on leaves
Period of Activity
Symptoms develop about 2 weeks after exposure.
Management Notes
Applications should be made before the end of grape bloom, or with shielded sprayers or wiper equipment.
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