Try Chamomile Tea or Rescue Remedy to prevent shock when planting out your new plants. Make the tea as usual and then spray on the foliage or water the plant with it. Dissolve a few Rescue Remedy pills in a liter of water and either water the plant or use it as a foliar spray. Always add a few drops of dishwashing liquid to a foliar spray as this helps the liquid to stick to the leaves. Chamomile tea has also been used on rust and other plant diseases, so give it a try before resorting to chemicals.