Claim · model-written summary
The authors warn that clopyralid spray overlap can cause unacceptable wheat injury and yield loss.
- Taxon
- winter wheat
Triticum aestivume1 - Outcome
- spray overlap clopyralide0
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleTreatmentComparatorSettingDirectionValueQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Verbatim
e0“where there is a spray overlap clopyralid can cause unacceptable wheat injury and yield loss”
e1“sensitivity of winter wheat to clopyralid”
Title
Winter Wheat Tolerance to Clopyralid Applied in the Fall, Spring, or Fall Followed by Spring
Nader Soltani; Christy Shropshire; Peter H. Sikkema Journal of Agricultural Science 2025. doi:10.5539/jas.v17n5p21
Other claims from this paper (15)
- Observation No visible injury was observed at 1, 2, or 4 weeks after clopyralid treatment.
- Intervention effect Fall clopyralid application caused no winter wheat injury at any tested rate.
- Intervention effect Spring clopyralid at 100 g ai ha-1 caused 3% visible wheat injury.
- Intervention effect Spring clopyralid at 200 g ai ha-1 caused 7% visible wheat injury.
- Intervention effect Spring clopyralid at 400 g ai ha-1 caused 14% visible wheat injury.
- Intervention effect Sequential clopyralid at 100 g ai ha-1 caused 4% visible wheat injury.
- Intervention effect Sequential clopyralid at 200 g ai ha-1 caused 9% visible wheat injury.
- Intervention effect Sequential clopyralid at 400 g ai ha-1 caused 17% visible wheat injury.
- Intervention effect Across rates and timings, clopyralid had no significant effect on wheat height or seed moisture.
- Intervention effect Fall clopyralid at all tested rates did not affect wheat yield.
- Intervention effect Spring clopyralid at 100 or 200 g ai ha-1 had no impact on wheat yield.
- Intervention effect Spring clopyralid at 400 g ai ha-1 reduced wheat yield by 19%.
- Intervention effect Sequential clopyralid at 100 fb 100 or 200 fb 200 g ai ha-1 had no significant wheat-yield effect.
- Intervention effect Sequential clopyralid at 400 fb 400 g ai ha-1 reduced wheat yield by 17%.
- Recommendation The authors conclude that label-rate clopyralid applied in fall, spring or sequentially has no adverse effect on winter wheat.