porkpal said: A brush killer would not have killed the grass.
We do not know what chemical was used.
I do not believe the chemical sprayed from the plane was a brush killer. The field looks to be maintained for a crop purpose and a brush killer shouldn't be needed.
We do not know the environment (Drought conditions, excess rain, insect or disease) this shrub may have encountered this year.
Best bet is holding hope that it returns fine next Spring.
