Docket Number: EPA - HQ - OPP - 2007 - 1084

www.regulations.gov



## Sodium Tetrathiocarbonate

**Registration Review Final**  **Decision**

**September 2011** 2 

## Sodium Tetrathiocarbonate **Registrati on Review**  **Final Decision**  **September 2011**  **Case Number** 

## 7009

**Approved by: ______________________**

**Richard P. Keigwin, Jr. Director,**  **Pesticide Re -**  **evaluation Division**  **Date:**

**______________________**3 **TABLE OF CONTENTS I.**  **INTRODUCTION** ................................ ................................ ........................ 4 **II. BACKGROUND INFORMATION**  ................................ ........................... 5 **III. REGISTRATION REVIEW**  **FINAL DECISION**  ................................ ..... 64

**I. INTRODUCTION**  This document is the Environmental Protection Agency ’s (EPA or the Agency) Registration Review Final Decision for sodium tetrathi ocarbonate and is being issued pursuant to 40 CFR § 155.57 and § 155.58. A registration review decision is the Agency ’s determination whether a pesticide meets, or does not meet, the standard for registration in the Federal Insecticide, Fungicide, and Rod enticide Act (FIFRA). FIFRA, as amended b y the Food Quality Protection Act (FQPA) of 1996, mandated the continuous review of existing pesticides. All pesticides distributed or sold in the United States must generall y be registered by EPA, based on scientific data showing that they

will not cause unreasonable risks to human health or the environment when used as directed on product labeling. The registration review program is intended to make sure that, as the ability to assess risk evolves and as polici es and practices change, all registered pesticides continue to meet the statutory standard of no unreasonable adverse effects to human health or the environment. Through the registration review program, the Agency periodically

reevaluates pesticides to make sure that as change occurs, products in the marketplace can be safely used. Information on this program is provided at: http://www.epa.gov/oppsrrd1/registration_review/ . In 2006, the A gency

implemented the Registration Review program pursuant to FIFRA Section 3(g), and will review each registered pesticide every 15 years to determine whether it continues to meet the FIFRA standard for registration. Pursuant to 40 CFR § 155.50, the A gency formally initiated registration review for sodium tetrathiocarbonate (case 7009 ). The following timeline highlights significant events that have occurred during the registration review of sodium tetrathiocarbonate :  December 1 9 , 2007

– Publication o f the sodium tetrathiocarbonate Summary Document , Scoping Document, and Problem Formulation Document in the docket (EPA - HQ - OPP - 200 7 - 1084) for a 90 - day public comment period. The Summary Document also included the preliminary work plan.

 May 28 , 2008

– S ignature of the sodium tetrathiocarbonate Final Work Plan and the Agency ’s response to the public comment s received during the 9 0 - day comment period on the sodium tetrathiocarbonate Summary Document . The one comment received did not chang e the work plan set out in the Preliminary Work P lan . The Sodium Tetrathiocarbonate Final Work Plan was modified slightly from the Sodium Tetrathiocarbonate Preliminary Work Plan to include additional human health data requirements. The doc ument describing the updated human health data requirements is included in the public docket (EPA - HQ - OPP - 2007 - 1084).

 November 10, 2010

– Publication of a Notice of Receipt of r equests to v oluntarily c ancel all remaining p esticide registrations containing sodium tetrathiocarbonate in the Federal Register (75 FR 69073 ) ( FRL - 88 51 - 5 ) . The docket number for the receipt of the voluntary

cancellation is EPA - HQ - OPP - 2009 - 1017. No comments5 were received regarding sodium tetrathiocarbonate during the 30 - day comment period.

 February

25, 2011

– Pub lication of the Product Cancellation Order for all remaining pesticide registrations containing sodium tetrathiocarbonate in the Federal Register (76 FR 10587 ) (F RL - 88 63 - 4 ) .  May 4, 2011

– Publication of the sodium tetrathiocarbonate Registration Review Proposed Final Decision Notice of Availability in the Federal Register (76 FR , number 86 , pages 25340 - 25342 ).

 July 5 , 2011

– Closure of the 60 - day public comment perio d on the proposed decision. No comment was received. **II. BACKGROUND INFORMATION**  Sodium tetrathiocarbonate is a soil fumigant which acts as a fungicide, insecticide, and nematicide. Sodium tetrathiocarbonate degrades to carbon disulfide, hydrogen sulfide , sodium hydrazide, and elemental sulfur upon contact with water. C arbon disulfide (P C code 016401) is the major biologicall y active degradate. T olerances are established for carbon disulfide from the application of sodium tetrathiocarbonate. Carbon disulfide from the application of sodium tetrathiocarbonate is the residue of concern for risk assessment. Sodium tetrathiocarbonate is registered for pre - plant and post - plant soil applications on almonds, grapes, lemons, oranges, peaches, prunes, and plums. It provides control of soil nematodes (e.g., ring, root - knot), diseases (e.g., phy t ophthora, armillaria) and insects (e.g., grape phyl loxera). It cannot be used in greenhouses and other enclosed areas. There are no registered residential uses. Sodium tetrathiocarbonate is currentl y labeled for use only in Arizona, Cali fornia, Oregon, and Washington. The most recent environmental fate and ecological risk assessments for sodium tetrathio carbonate were completed in 1995 and 1996 in support of the proposed new uses on almonds, peaches, and prunes . The most recent human health assessments were also completed in 1995 and 1996 in support of the same proposed new uses. After the Final Work Plan was signed in May 2008 as part of the regi stration review process for sodium tetrathiocarbonate , the technical and end - use product registrant , Ary st a Lifescience North America, LLC, inf ormed the Agency

that they were requesting to voluntarily

cancel all of their sodium tetrathiocarbonate product registrations. These were the last remaining products registered in the U.S. containing sodium tetrathiocarbonate. A Notice of Receipt of requests to v oluntaril y c ancel all p esticide registrations containing sodium tetrathiocarbonate published in the Federal Register on November 10, 2010. There were no comments submitted regarding sodium tetrathiocarbonate d

uring the 30 - day

comment period. The Agency then issued the product cancellation order on February 25, 2011 for all remaining sodium6

tetrathiocarbonate product registrations. (Copies of those documents are included in the docket for this registration review.) As specified in the Cancellation Order, registrants are prohibited from selling or distributing end - use products containing sodium tetrathiocarbonate as of February 25, 2012. After February 25, 2012 , persons other than the registrants may

sell, dis tribute, or use existing stocks of products cont aining sodium tetrathiocarbonate until existing stocks are exhausted, provided that such sale, distribution, or use is consistent with the terms of the previousl y approved labeling on, or that accompanies, th e cancelled products. **III. REGISTRATION REVIEW**  **FINAL DECISION**  As stated in the Preliminary Work Plan for sodium tetrathiocarbonate , the Agency had intended to revise the existing risk assessments for sodium tetrathiocarbonate . However, due to the cance llation order issued affecting all sodium tetrathiocarbonate product registrations in the United States, the Agency found that it is not necessary to conduct new risk assessments for sodium tetrathiocarbonate and , therefore , issued a proposed decision purs uant to 40 CFR Part 155.53(c)(2) and 40 CFR Part 155.58. The voluntary cancellation of all remaining U.S. sodium tetrathiocarbonate registrations will become effective prior to the previously planned completion dates for the revised sodium tetrathiocarbon ate risk assessments . The Registration Review Timeline introduced in the Sodium T etrathiocarbonate P reliminary W ork P l an proposed that the Agency would issue the preliminary

risk assessments by

September 2012 and issue the revised risk assessments by

Marc h 2013 , with a final registration review decision scheduled for completion by

September 201 3. The existing stocks sales and distribution deadlines included in the February 25, 2011 cancellation order ensure that sodium tetrathiocarbonate sale, distributio n, and use will decline and eventually cease entirel y in the United States in the future. During this period, the Agency

believes that existing stocks of sodium tetrathiocarbonate products may be used until depleted without causing unreasonable risk to human health and the environment. Pursuant to 40 CFR § 155.57 and 155.58, the Agency is issuing the registration review final decision , thus concluding the sodium tetrathiocarbonate registration review for the reasons discussed above. The affected product registrations are subject to the terms and conditions of the February 25, 2011 cancellation order.