Here are the two earliest mentions I could find of Arab boycotts of Jews from the Chicago Sentinel. For some reason the JTA article is not listed in the JTA archives.
January 6, 1921 in Nablus, then known as Sichem (Shechem):
August 31, 1922:
Visit Elder of Ziyon.
About the Author: Elder blogs at http://elderofziyon.blogspot.co.il/
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