You have a female Chinese pistache, thus the berries. The tree is stressed for some reason. The usually cause is dry soil although soggy wet/poorly drained soil is also a possibility. Weed and feed fertilizers used in turf around the tree can also cause problems. I suggest that if soil is dry you give it a good soaking now. In early spring apply a cup or two of turf fertilizer per inch of trunk diameter spread evenly throughout a large circular area. Repeat this in early summer. Each time water the fertilizer in well. During summer give the tree a good watering of about 1-2 inches every two weeks when it has not rained. Wet a large area extending out about 2 times the branchspread on a young tree or 1 times the branch spread on an older tree.
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