Phytosanitary Certificate is required for both fresh and frozen blueberries.
Maximum Residue Levels (MRLs) are strictly enforced for fruit entering Japan. Japan frequently tests imported food product MRL levels and will take action if the residue amount exceeds the Japanese established MRL. Japan also has a 0.01 ppm default tolerance for any MRL that has not yet been established. Specifically, for 87 pesticides with US blueberry MRLs, 28 have a Japanese MRL more restrictive than the U.S. MRL. Fifty-nine (59) of these pesticides have a Japanese MRL harmonized with or set higher than the U.S. MRL.
More information on MRL levels can be found within the Global MRL Database: https://www.bryantchristie.com/BCGlobal-Subscriptions/Pesticide-MRLs. Thanks to funding from the U.S. Department of Agriculture and the Environmental Protection Agency, a started level subscription to the database is available for no charge.
Under the U.S. –Japan Trade Agreement, effective as of January 1, 2020, fresh and dried U.S. blueberries can now enter Japan duty-free.