Answer: That white snowy stuff might be colonies of cottony scale or mealybugs. I would prune off the affected branches to remove the insects before they really get out of hand. Both are very difficult to control once the populations grow large. So, prune off the affected branches and get them out of the garden as soon as possible.
Newly transplanted trees can suffer transplant shock. Once the roots become established they will perk up. You are watering too often. If you keep the soil too wet the roots can suffocate. Water deeply every 3-4 days and they will establish soon.
Good luck with your garden!
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