PMEP Home Page --> Pesticide Active Ingredient Information --> Herbicides, Growth Regulators, and Desiccants --> Herbicides, F to M --> Halosulfuron-Methyl --> Halosulfuron-Methyl - Registration of Permit® 5/97

Halosulfuron-Methyl - Registration of Permit® Herbicide 5/97

New York State Department of Environmental Conservation
Division of Solid & Hazardous Materials
Bureau of Pesticides Management
Pesticide Product Registration Section
50 wolf Road, Albany, New York 12233-7250
Phone 518-457-6934 FAX 518-457-0629
E-Mail: ppr@gw.dec. state.

May 2, 1997


Mr. Stephen A. Adams
State Registration Manager
Monsanto Company
800 N. Lindbergh Boulevard (C2SF)
St. Louis, MO 63167

Dear Mr. Adams:

Re: Application for Registration of Permit® Herbicide (EPA Reg.
    No. 524-465) Containing the Active Ingredient Halosulfuron-methyl:

The New York State Department of Environmental Conservation has completed the review of
your application received on October 23, 1995, together with all of the supporting supplemental
information supplied to date, regarding registration of the referenced pesticide product in New
York State. Permit® Herbicide contains the active ingredient halosulfuron-methyl.

The first New York State registration of a pesticide product containing the active ingredient
halosulfuron-methyl was Manage® Turf Herbicide (EPA Reg. No. 524-465). Manage® Turf Herbicide
was registered by this Department on April 15, 1997.

Permit® Herbicide (EPA Reg. No. 524-465) is a.selective herbicide for preemergence and
postemergence control of annual broadleaf weeds and nutsedge in field corn, field corn
grown for seed, and grain sorghum (milo). Permit Herbicide is labeled for two postemergence
applications of 0.032-0.063 lb. active ingredient per acre with a total application not to
exceed 0.125 lb. active ingredient per acre per use season. Preemergence soil applications
used exclusively with Pioneer IR field corn hybrids allow a maximum of 0.157 lb. active
ingredient per acre per use season. Permit Herbicide postemergence application to grain
sorghum (milo) is limited to a single application of 0.032 lb. active ingredient per acre
per use season.

The Department reviewed halosulfuron-methyl and the referenced pesticide product regarding
potential human health, nontarget organism, and ground and surface water impacts.

Halosulfuron-methyl and the Permit® Herbicide formulation were not very toxic to laboratory
animals in acute studies and halosulfuron-methyl was generally not very toxic in subchronic
or chronic exposure studies.

There are no chemical-specific federal or State drinking water/groundwater standards for
halosulfuron-methyl or its major degradates, 3-chlorosulfonamide acid (3-CSA), and
3-chlorosulfonamide ester. Based on their chemical structures, each fall under the 50
micrograms per liter New York State drinking water standard for "unspecified organic
contaminants" (10 NYCRR Part 5-Public Water Systems). The State drinking water standard
for the sum of these compounds is 100 micrograms per liter.

The Department's leaching simulations predict that, when Permit® Herbicide is applied as
labeled, concentrations of halosulfuron-methyl and its degradates in leachate (groundwater)
will remain below applicable drinking water standards and trigger values.

According to the Department's aquatic and terrestrial models, halosulfuron-methyl is not
toxic to mammals, birds, insects, fish, or aquatic invertebrates on an acute or chronic
basis. It is toxic to representative species of aquatic macrophytes. Based on the
aquatic study data submitted by Monsanto and the Department's Aquatox modeling, there
is the potential that runoff to surface water from labeled use rates of Permit© Herbicide
could result in environmental concentrations of halosulfuron-methyl sufficient to cause
toxicity to representative aquatic plants.

While use of Permit® poses a potential risk to aquatic plants, there are agronomic and
environmental benefits associated with this postemergent herbicide for nutsedge control.

Although there are currently 48 pesticide products registered in New York State to control
nutsedge, most of these products provide, minimal control and have associated
groundwater/drinking water risks. According to Cornell University researchers, the other
products are not as efficacious in providing nutsedge control. These products only suppress
nutsedge growth. Therefore, there is an annual need for both pre- and postemergence

The current product recommended by Cornell for postemergence nutsedge control is Laddock®, a
combination of sodium bentazon and atrazine. Atrazine has been identified as a significant
Teacher and has been found in groundwater and surface water across the United States. The
United States Environmental Protection Agency is conducting a special review of atrazine
regarding a possible link to breast cancer.

Monsanto, in the normal course of business, is pursuing a project called "Operation
Greenstripe." In this endeavor, Monsanto works with growers to plant a vegetated buffer
strip at the edge of cropped fields which limits the amount of runoff reaching aquatic
systems. Monsanto has offered to put a more aggressive effort into this venture in New
York State in lieu of performing an additional study.

The Department hereby accepts for registration Permit® Herbicide (EPA Reg. No. 524-465)
subject to the following conditions:

o  Permit® Herbicide must be included in the New York State Corn Herbicide Management Plan
   and Monsanto must provide the Department, within 90 days of receipt of this letter, with
   the educational brochure associated with the Corn Herbicide Management Plan;

o  Monsanto must provide the Department with an annual report of its efforts regarding
   "Operation Greenstripe" in New York State.

o  Monsanto must provide interim and final study results for the work currently proceeding
   in California with the use of halosulfuron-methyl on rice.

Enclosed for your files are the Certificate of Pesticid Registration and New York State
stamped "ACCEPTED" labeling.

Please contact Maureen P. Serafini, Supervisor of our Pesticide Product Registration
Section, at (518) 457-7446, if you have any questions.


Norman H. Nosenchuck, P.E.
Division of Solid & Hazardous Materials

cc: w/enc. - N. Kim/A. Grey - NYS Dept. Of Health
    N. Rudgers/R. Mungari - NYS Dept. of Ag. & Markets
    D. Rutz/W. Smith - Cornell PMEP