I have always had very high success rate here with Mangoes. With temperatures in the summer months over 100 degrees and long growing seasons, my other mango trees thrive here, and lots of other people have them here too. As for this sad tree, I agree with the possibility of a pre existing infection that was brought out during the stress of shipping. I have 7 other mangoes that are all very alive and producing. For those in San Diego areas, the milder climate and wetter weather can be an impairment, but we are fortunate here that most tropicals can adapt and thrive here. I will look into grafting. For now, I suppose I will look into alternate trees to replace this seemingly dead tree. Any ideas for a good Mango. I already do have an unknown variety that might be Valencia Pride, Carrie, Honey Kiss, Alampur Baneshan, Irwin, Ice Cream, Cotton Candy and Coconut Cream.