That's most likely a cultural issue: Too wet, too much fertilizer, too dry, etc. Pests don't kill trees that fast esp three different species. It's likely something you or mother nature did or didn't do. Has it rained a lot lately?

Either that or the trees were in very bad shape when planted.

What kind of soil? How did you amend it? How much and how often are you watering? We need photos!

Thank you for your replies - The soil is clay loam, it has been hot and dry. These trees came in fairly large pots. I may be over watering, was watering every couple of days because it was so hot, but I have quit since they are not happy. I tried to add a picture to my post, but I must have done something wrong, as it didnt show up.