I've had my lemon tree for over a year now, and i just recently brought it outside due to the nice weather. It was previously indoors because of the long winter months. Recently, i noticed that the leaves on the tree have started turning white/brown. The top of the leaves have started to change colour (white) and the other side of the leaves have turned brown. In addtion, the branches and thorns have also started to turn brown. I dont know how to solve this problem, i am in need of help !! I thought it was some sort of infection so i cut off the leaves that looked the worse (majority of the leaves) and left some on the tree.