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Establishing Residue Decline Curves for Pesticides in Blueberries

The U.S. Highbush Blueberry Council (USHBC) has collaborated with Oregon State UniversityMichigan State UniversityAg Metrics Group and Synergistic Pesticide Laboratory, LLC to establish residue decline curves for pesticides that have no established Maximum Residue Limits (MRL) and MRLs that are lower than U.S. tolerances.

The objective was to investigate the residual level of multiple pesticides at different consequential timings after application on blueberry, thus understanding their degradation ratio and speed for better application/harvesting strategies. These findings would in turn allow for the development of low residue programs that meet the low MRL standards.

Specifically, research entities have applied 18 insecticides and 15 fungicides on highbush blueberries for three years in five growing sites (to account for variation in climate, varietals, and pest and disease vulnerability). Research entities sent samples to Synergistic Pesticide Laboratory LLC for chemical residue extraction and analysis over the span of three years.

As a result of this research study, several insecticides and fungicides can be applied to blueberries for export markets that could not have been used previously. Read the full report and in-depth findings on each pesticide here. — By the U.S. Highbush Blueberry Council

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