I would like to add that there are plant viruses, and also funguses that can also be a problem that you can unwittingly be bringing to your valuable trees and plants. Learning to spot plant disease is just about an art form. I have seen people posting pictures of their fig trees which appear to be highly infected with FMV... but likely more!
All the best,
Wish list: White Madeira #1, Unk Pastiliere, Cravens Cravings, LSU Strawberry, Dannys Delight, Emalynís Purple, Yellow Longneck, Peters Honey, Col Littmans Black Cross, Green Michurinska, Cool Hybrids, Impellezeri, Sangue Dolce, 5 Terre A