We had 3 trees planted 5 yrs. ago. They grew well and now are 8 to 11 ft. tall. However over the past 3 yrs. we experienced some tips that brownout in different locations around the trees, about 7 or 8 such brown spots. We also have every yr. where whole branches slowly start to turn light green and then yellow and over a few months the branch turns brown ,this occurs in only one spot on the tree and has done this with 2 different trees . a third one has not yet had this problem. Early this spring we had to cut a large branch 2/3 up one of the trees out. Now a smaller branch on another tree has begun to turn light yellow and a few tips have turned brown. Last yr. the Penn St. Ag. Center looked at snipped branches and got back to us that the tree was under stress. We are at a loss to understand this problem and do not want to loss the trees. Now they are really growing nice new shoots. We would like your advice on what might be happening.
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