Diflubenzuron Focus Meeting Summary

 August 22, 2012 

1:00 – 2:00 pm

Objective

The purpose of the meeting was for members of the Environmental
Protection Agency Office of Pesticide Programs’ Pesticide
Re-evaluation Division (PRD), Environmental Fate and Effects Division
(EFED), Health Effects Division (HED), Biological and Economic Analysis
Division (BEAD), and Registration Division (RD) to meet with Chemtura
Corporation (Chemtura), a technical registrant for diflubenzuron, to get
a better understanding of the need for and scope of a residential
exposure assessment during registration review.  

Attendees

Chemtura (via conference call): Kevin Donovan, Judy Ball

EPA: Steven Snyderman (PRD), Avivah Jakob (PRD), Tracy Perry (PRD), John
Hebert (RD), Autumn Metzger (RD), Sue Hummel (HED), James Miller (HED),
Don Atwood (BEAD), John Faulkner (BEAD), Faruque Khan (EFED)

Discussion

In response to Agency questions regarding its diflubenzuron products,
Chemtura detailed specific use information and gave a broader
understanding of total U.S. usage of these non-agricultural products. 
The discussion covered: 1) non-agricultural uses, including better
characterization of outdoor forest lands, standing water, tree shrub,
recreational area, and ornamental plant uses (i.e., application rates,
number of applications, acres treated, and timing of applications); and
2) the general usage of residential products registered for use on bird
ponds, pool tarps, and as an impregnated wood termiticide.  Of
particular value was the applicator information on the residential uses
for the EPA Reg. No. 400-543 label (i.e., bird ponds, fountains, small
water gardens, pool tarps, and impregnated wood termite use).  In
addition, Chemtura explained its minor use products, including
registered feed-through cattle labels.

Follow-up

Based on the discussion, the Agency concluded that a residential handler
and post-application exposure assessment is needed in registration
review.  EPA will continue to work with Chemtura and other diflubenzuron
registrants to clarify labels.

