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California DPR Announces Changes to California-like Conditions for Terrestrial Field Dissipation Studies
On May 29, 2019, the California Department of Pesticide Regulation (DPR) released California Notice 2019-05: Changes to California Notice 2018-06: California-like Conditions for Terrestrial Field Dissipation Studies (Notice 2019-05), which updates the guidance in California Notice 2018-06: California-like Conditions for Terrestrial Field Dissipation Studies (Notice 2018-06).
Notice 2018-06, issued in January of 2018, provided to applicants for California registration of new agricultural use pesticides guidance specifically related to the requirement to submit at least one terrestrial field dissipation (TFD) study conducted under “California or similar environmental use conditions.” DPR states it is revising this guidance based on comments from the Western Plant Health Association. The updated guidance is summarized below.
Notice 2019-05 also extends the effective date to July 1, 2020; for applications submitted July 1, 2020, or later, DPR states it will consider a TFD study to have been conducted under “California or similar environmental use conditions” if the study was conducted within or outside of California in accordance with U.S. Environmental Protection Agency (EPA) study guidelines and under certain criteria, as provided below.
1. Timing: April 1 shall be the earliest study start date and September 30 shall be the latest start date. This timing ensures a potential leaching environment with respect to the amount of percolating water produced relative to evapotranspiration (ET).
3. Water Inputs:
DPR states that if a TFD study submitted to DPR to meet the statutory requirement of having been conducted under “California or similar environmental use conditions” does not meet one or more of the above criteria, the applicant may include in its submission a justification for any different criteria to avoid a determination that the study is unacceptable.
Table 1. USDA textural classes1 of soils acceptable for TFD studies
1Based on USDA particle-size classification.