US EPA announces proposed registration for new pesticide metamitron

The U.S. Environmental Protection Agency (EPA) released its proposed registration decision for plant growth regulator products containing the new active ingredient (AI) metamitron for use on apple and pear trees. Metamitron is a chemical thinning agent applied to apple and pear tree leaves shortly after the blooming stage to thin excess fruit. This allows the remaining fruit to grow larger and may contribute to higher quality fruit and plant health. 

EPA's Risk Assessments 

In addition to its proposed registration decision, EPA has also released its draft human health and ecological risk assessments as well as a biological evaluation for the pesticide under the Endangered Species Act (ESA).  

No human health risks of concern were identified when metamitron is used according to the label. EPA conducted an ecological risk assessment and biological evaluation (BE) under the ESA and initiated an informal consultation with the U.S. Fish and Wildlife Service (FWS). In its effects determination, EPA found that metamitron was not likely to adversely affect any of the identified species or critical habitats. EPA will not move forward with any final decision on these registrations until the informal consultation with FWS is complete.  

After considering public comments on the proposed registration and the draft risk assessment, EPA will determine whether the registration action meets the FIFRA registration standard. If EPA determines that the registration action can be granted, EPA will finalize the decision and the risk assessment including the ESA effects determination. 

To read more about the proposed registration of metamitron and to comment, see docket ID EPA-HQ-OPP-2022-0575 at www.regulations.gov. The public comment period will be open for 15 days, closing on October 14, 2024.