Carfentrazone
Trade Name: Aim EC
Registration status: This herbicide is registered for use in orchards with a hooded sprayer.
When to suspect injury: Injury may occur from drift from under-tree applications if the sprayer hood is not working. Also, injury may occur from drift from neighbouring fields under windy conditions. If you notice symptoms of spotting on leafs or necrotic plants, look carefully at neighbouring fields, and at weeds in the treated area.
Herbicide Information: Knowing how the herbicide works will help to determine the likelihood of injury from either direct application or drift. Consider how the herbicide works in plants, behaves in soils and what symptoms are common in other plants.
Chemical Family/Group: Aryl triazolinone
Site of Action: Inhibitors of protoporphyrinogen oxidase (Protox) (WSSA Group 14)
General Symptoms in Plants
- Necrotic spotting on leaves
- Initial symptoms appear within a few hours
- Plant death within a few days
Symptoms in Fruit Trees
- Same as above, necrotic spots on leaves, appearing within hours after application
- Leaves may die after several days if enough spray contacts the leaves
Uptake and Translocation
- Taken up through the foliage
- Not readily transmitted
Persistence
- No residual activity
If you suspect herbicide injury, laboratory analyses of herbicide levels in plant tissue are necessary to confirm the presence of herbicides, although symptoms may be helpful in diagnosing which herbicides caused the problem.
Both damaged and healthy plant tissues should be analyzed, because comparison levels are not readily available for many herbicides. Contact your lab for instructions on which plant parts should be sampled, how to handle and ship the sample, and what costs are involved to ensure an accurate and timely diagnosis.
(Photo source: http://herbicidesymptoms.ipm.ucanr.edu/?selectedAI=141)
