Picloram
Trade Name: Tordon 101
Group 4
Site of Action: Synthetic auxins
Symptoms
At first symptoms include:
- Bending, twisting, swelling and elongation of stems
- Leaf cupping and curling
Followed by:
- Chlorosis at the growing points
- Growth inhibition
- Wilting
- Necrosis, and death of susceptible plants within 3- 5 weeks
- Low concentration may cause young leaves to look puckered
Uptake and Translocation
- Rapidly absorbed by the roots, stems and foliage.
- Translocation can be up or down with accumulation is in young, rapidly growing meristematic tissue.
Persistence
- Injury may be observed in fall cover crops
- Deep ploughing will minimize any carryover effect