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Blackberry Tree Experiment

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On September 28, we collected 30 gall balls near Susquehanna University, Selinsgrove, Snyder County, PA. we have two sites. We chose a blackberry tree (Prunus serotine) in the field and use the tape measure to draw a circle with a radius of 2 meters and marked this area as our site 1. Then as the same blackberry tree as the center, draw a circle with a radius of 10 meters and marked the area out out this circle as our site 2. Group 1 random collected 15 gall balls from site 1 and marked them with red tape. Group 2 random collected 15 gall balls from site 2 and marked them with green tape. After the collection, we bring all the 30 samples to the laboratory separately. Each group used knife and forceps to cut and open the gall balls and put the
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