I received 4 October Glory acer rubrum trees (smart pots) from a mail-order nursery (Sooner Plant Farm) and planted them on Saturday (day after they arrived). I soaked the root ball the day they arrived (after 4 days in transit) and soaked the entire dug-up area when planting to remove the air pockets from the soil.

Temperatures over the past week have been between 60 and 85 degress.

Leaves have developed brown spots as shown in the pictures. Thoughts on what's going on and how to correct?

Thanks!