Posted: 12/07/2013 at 14:27
Yes, probably lack of watering, Carol. Newly planted trees of any kind should be watered once a week for a few months, regardless of the time of year that they are planted. You might save them but at least being new plantings they will be easy to remove should they die and you want to replace them. Unfortunately, it is unlikely the brown bits will sprout fresh green growth though, even if the trees do survive, so if you can live with that it's worth trying to save them, otherwise replace (in which case wait until late Autumn which is the best time to plant new trees.)
PS: when you say the ground was quite wet, is it possible that it's permanently waterlogged? That will also kill them!