For those who don't feel like wading through the entire report Azoxystrobin showed to very effective against rust when used as a foliar spray. But I have also been using it on new plants when they arrive as a root dip, then when the plants are potted up I have used the solution to pour into the pots as a drench.
Quote from the study:
"Azoxystrobin was also shown to significantly reduce disease severity for up to 9 weeks postapplication when used as a root dip and as a single soil drench treatment."
