March 28, 2006 

Cyrus R. Lesser, Chief 

Mosquito Control Section 

Office of Plant Industries and Pest Management 

Maryland Department of Agriculture 

50 Harry S. Truman Parkway 

Annapolis, Maryland 21401 

Dear Mr. Lesser: 

The Maryland Department of the Environment, having reviewed the information in 

your applications and having considered comments by Maryland Department of 

Natural Resources (DNR), Environmental Review Unit, partially approves your 

request to use the toxic materials specified below for mosquito control in 

State waters throughout Maryland. Toxic Materials Permit TMP-06-197 is issued 

subject to the conditions below. These conditions incorporate all of the 

recommendations of the Environmental Review Unit in their March 27, 2006 

letter to the Department. Additionally, these recommendations include the 

attached table, in which DNR has identified areas where application of these 

requested toxic materials shall be restricted or prohibited. 

The Department reserves the right to withdraw or qualify approval for specific 

sites upon receipt of new information from the Department of Natural 

Resources. Unless otherwise noted for specific sites, this permit is effective 

through the end of 2010. During the course of this permit, you may substitute 

other individuals to supervise application of the materials, provided that 

they are licensed applicators. 

SPECIAL CONDITIONS 

ALLEGANY COUNTY

1. Approval is for the use of methoprene, Bacillus Thuringiensis 

israelensis (B.t.i.), and Bacillus sphaericus (B.s.) on a total of 132 

acres of marshes, woodland pools, ditches, and other standing water (as 

shown on maps submitted as part of the application) in Cumberland, 

Mexico Farms, and Potomac Park. 

2. The methoprene, B.t.i., and B.s. will be used solely in the 

aforementioned waters and in strict adherence to the recommendations of 

the manufacturer. The application will be by spraying and broadcasting. 

 

3. The application of the methoprene, B.t.i., and B.s. will be supervised 

by Michael A. Cantwell, Entomologist, Maryland Department of 

Agriculture. 

4. This permit is valid for up to five full applications between March 1 

and October 15. 

5. There shall be no direct application of methoprene to Use III 

waters, headwater tributaries, or contiguous wetlands. Between 

March 1 and June 15, there shall be no direct application of 

methoprene to documented anadromous finfish spawning areas or 

their contiguous wetlands. 
Cyrus R. Lesser, Chief 

Page 2 

ANNE ARUNDEL COUNTY

1. Approval is for the use of methoprene, B.t.i., and B.s. for mosquito 

control on a total of 3,198 acres of woodland pools, roadside ditches, 

other standing water, and wetlands (as shown on maps submitted as part 

of the application) in Anne Arundel County. 

2. The methoprene, B.t.i., and B.s. will be used solely in the 

aforementioned waters and in strict adherence to the recommendations of 

the manufacturer. The application will be by spraying and broadcasting. 

3. The application of the methoprene, B.t.i., and B.s. will be supervised 

by Michael Cantwell, Entomologist, Maryland Department of Agriculture. 

4. This permit is valid for up to five full applications of methoprene, 

B.t.i., and B.s. between March 1 and October 15. 

5. There shall be no direct application of methoprene to Use III waters, 

headwater tributaries, or contiguous wetlands. Between April 1 and June 

15, there shall be no direct application of methoprene to documented 

anadromous finfish spawning areas or their contiguous wetlands. 

6. Use of residual formulations of methoprene is prohibited in 

estuarine wetland areas. 

BALTIMORE COUNTY

1. Approval is for the use of methoprene B.t.i., and B.s. for mosquito 

control on a total of 1,314 acres of woodland pools, ditches, storm 

water management ponds, other standing water, and wetlands (as shown on 

maps submitted as part of the application) in Baltimore County. 

2. The methoprene, B.t.i., and B.s. will be used solely in the 

aforementioned waters and in strict adherence to the recommendations of 

the manufacturer. The application will be by spraying and broadcasting. 

3. The application of the methoprene, B.t.i., and B.s. will be supervised 

by Michael A. Cantwell, Entomologist, Maryland Department of 

Agriculture. 

4. This permit is valid for up to five full applications of methoprene, 

B.t.i., and B.s. between March 1 and October 15. 

5. There shall be no direct application of methoprene to Use III waters, 

headwater tributaries, or contiguous wetlands. Between March 1 and June 

15, there shall be no direct application of these materials to 

documented anadromous finfish spawning areas or their contiguous 

wetlands. 

6. Use of residual formulations of methoprene is prohibited in 

estuarine wetland areas. 

CALVERT COUNTY

1. Approval is for the use of methoprene, B.t.i., and B.s. for mosquito 

control on a total of 2,995 acres of woodland pools, ditches, storm 

water management ponds, other standing water, and wetlands (as shown on 

maps submitted as part of application) in Calvert County. 

2. The methoprene, B.t.i., and B.s. will be used solely in the 

aforementioned waters and in strict adherence to the recommendations of 
Cyrus R. Lesser, Chief 

Page 3 

 the manufacturer. The application will be by spraying and broadcasting. 

 

3. The application of the methoprene, B.t.i., and B.s. will be supervised 

by William Clay, Supervisor, Calvert County Mosquito Control. 

4. This permit is valid for up to five full applications of methoprene, 

B.t.i., and B.s. between March 1 and October 15. 

5. Between March 15 and June 15, there shall be no direct application 

of methoprene to documented anadromous finfish spawning areas or 

their contiguous wetlands. 

6. Use of residual formulations of methoprene is prohibited in 

estuarine wetland areas. 

CARROLL COUNTY

1. Approval is for the use of methoprene, B.t.i., and B.s. for mosquito 

control on a total of 31 acres of woodland pools, ditches, storm water 

management basins, wetlands, and other standing water (as shown on maps 

submitted as part of application) in Carroll County. 

2. The methoprene, B.t.i., and B.s. will be used solely in the 

aforementioned waters and in strict adherence to the recommendations of 

the manufacturer. The application will be by spraying and broadcasting. 

3. The application of methoprene, B.t.i., and B.s. will be supervised by 

Michael A. Cantwell, Entomologist, Maryland Department of Agriculture. 

4. This permit is valid for up to five full applications between March 1 

and October 15. 

5. There shall be no direct application of the methoprene to Use III 

waters, headwater tributaries, or contiguous wetlands. Between 

April 1 and June 15, there shall be no direct application of these 

materials to documented anadromous finfish spawning areas or their 

contiguous wetlands. 

CECIL COUNTY

1. Approval is for the use of methoprene, B.t.i., and B.s. for mosquito 

control on a total of 840 acres of woodland pools, ditches, dredge spoil 

sites, wetlands, and other standing water (as shown on maps submitted as 

part of application) in Cecil County. 

2. The methoprene, B.t.i., and B.s. will be used solely in the 

aforementioned waters and in strict adherence to the recommendations of 

the manufacturer. The application will be by spraying and broadcasting. 

3. The application of the methoprene, B.t.i., and B.s. will be supervised 

by Daniel Schamberger, Environmental Specialist, Maryland Department of 

Agriculture. 

4. This permit is valid for up to five full applications of methoprene, 

B.t.i., and B.s. between March 1 and October 15. 

5. There shall be no direct application of methoprene to Use III waters, 

headwater tributaries, or contiguous wetlands. Between April 1 and June 

15, there shall be no direct application of methoprene to documented 

anadromous finfish spawning areas or their contiguous wetlands. 
Cyrus R. Lesser, Chief 

Page 4 

6. Use of residual formulations of methoprene is prohibited in 

estuarine wetland areas. 

CHARLES COUNTY

1. Approval is for the use of methoprene, B.t.i., and B.s. for mosquito 

control on a total of 1,856 acres of woodland pools, roadside ditches, 

wetlands, and other standing water (as shown on maps submitted as part 

of application) in Charles County. 

2. The methoprene, B.t.i., and B.s. will be used solely in the 

aforementioned waters and in strict adherence to the recommendations of 

the manufacturer. The application will be by spraying and broadcasting. 

3. The application of the methoprene, B.t.i., and B.s. will be supervised 

by Michael Cantwell, Entomologist, Maryland Department of Agriculture. 

4. This permit is valid for up to five full applications of methoprene, 

B.t.i., and B.s. between March 1 and October 15. 

5. Between March 15 and June 15, there shall be no direct application 

of methoprene to documented anadromous finfish spawning areas or 

their contiguous wetlands. 

6. Use of residual formulations of methoprene is prohibited in 

estuarine wetland areas. 

DORCHESTER COUNTY

1. Approval is for the use of methoprene, B.t.i., and B.s. for mosquito 

control on a total of 36,155 acres of woodland pools, roadside ditches, 

wetlands, and other standing water (as shown on maps submitted as part 

of application) in Dorchester County. 

2. The methoprene, B.t.i., and B.s. will be used solely in the 

aforementioned waters and in strict adherence to the recommendations of 

the manufacturer. The application will be by spraying and broadcasting. 

 

3. The application of the methoprene, B.t.i., and B.s. will be 

supervised by David Schofield, Assistant Chief, Maryland 

Department of Agriculture. 

4. This permit is valid for up to five full applications of methoprene, 

B.t.i., and B.s. between March 1 and October 15. 

5. Between March 1 and June 15, there shall be no direct application 

of methoprene to documented anadromous finfish spawning areas or 

their contiguous wetlands. 

6. Use of residual formulations of methoprene is prohibited in 

estuarine wetland areas. 

FREDERICK COUNTY

1. Approval is for the use of methoprene, B.t.i., and B.s. for mosquito 

control in up to 254 acres of woodland pools, roadside ditches, 

wetlands, and other standing water (as shown on maps submitted as part 

of application) in Frederick County. 

2. The methoprene, B.t.i., and B.s. will be used solely in the 

aforementioned waters, and in strict adherence to the recommendations of 
Cyrus R. Lesser, Chief 

Page 5 

 the manufacturer. The application will be by spraying and broadcasting. 

 

3. The application of the methoprene, B.t.i., and B.s. will be supervised 

by Michael A. Cantwell, Entomologist, Maryland Department of 

Agriculture. 

4. This permit is valid for up to five full applications of methoprene, 

B.t.i., and B.s. between March 1 and October 15. 

5. There shall be no direct application of methoprene to Use III 

waters, headwater tributaries, or contiguous wetlands. Between 

March 1 and June 15, there shall be no direct application of 

methoprene to documented anadromous finfish spawning areas or 

their contiguous wetlands. 

HARFORD COUNTY

1. Approval is for the use of methoprene, B.t.i., and B.s. for mosquito 

control in up to 269 acres of woodland pools, roadside ditches, 

wetlands, and other standing water (as shown on maps submitted as part 

of application) in Harford County. 

2. The methoprene, B.t.i., and B.s. will be used solely in the 

aforementioned waters and in strict adherence to the recommendations of 

the manufacturer. The application will be by spraying and broadcasting. 

3. The application of the methoprene, B.t.i., and B.s. will be supervised 

by Michael A. Cantwell, Entomologist, Maryland Department of 

Agriculture. 

4. This permit is valid for up to five full applications of methoprene, 

B.t.i., and B.s. between March 1 and October 15. 

5. There shall be no direct application of methoprene to Use III 

waters, headwater tributaries, or contiguous wetlands. Between 

April 1 and June 15, there shall be no direct application of or 

methoprene to documented anadromous finfish spawning areas or 

their contiguous wetlands. 

6. Use of residual formulations of methoprene is prohibited in 

estuarine wetland areas. 

HOWARD COUNTY

1. Approval is for the use of methoprene, B.t.i., and B.s. for mosquito 

control on a total of 285 acres of woodland pools, roadside ditches, 

other standing water, and wetlands (as shown on maps submitted as part 

of application) in Howard County. 

2. The methoprene, B.t.i., and B.s. will be used solely in the 

aforementioned waters and in strict adherence to the recommendations of 

the manufacturer. The application will be by spraying and broadcasting. 

3. The application of the methoprene, B.t.i., and B.s. will be supervised 

by Jeannine M. Dorothy, Entomologist, Maryland Department of 

Agriculture. 

4. This permit is valid for up to five full applications of methoprene, 

B.t.i., and B.s. between March 1 and October 15. 
Cyrus R. Lesser, Chief 

Page 6 

5. Between March 15 and June 15, there shall be no direct application 

of methoprene to documented anadromous finfish spawning areas or 

their contiguous wetlands. 

KENT COUNTY

1. Approval is for the use of methoprene, B.t.i., and B.s. for mosquito 

control on a total of 1,184 acres of woodland pools, roadside ditches, 

other standing water, and wetlands (as shown on maps submitted as part 

of application) in Kent County. 

2. The methoprene, B.t.i., and B.s. will be used solely in the 

aforementioned waters, and in strict adherence to the recommendations of 

the manufacturer. The application will be by spraying and broadcasting. 

3. The application of the methoprene, B.t.i., and B.s. will be supervised 

by David A. Schofield, Assistant Chief, Maryland Department of 

Agriculture. 

4. This permit is valid for up to five full applications of methoprene, 

B.t.i., and B.s. between March 1 and October 15. 

5. Between March 15 and June 15, there shall be no direct application of 

methoprene to documented anadromous finfish spawning areas or their 

contiguous wetlands. 

6. Use of residual formulations of methoprene is prohibited in 

estuarine wetland areas. 

MONTGOMERY COUNTY

1. Approval is for the use of methoprene, B.t.i., and B.s. for mosquito 

control on a total of 66 acres of woodland pools, roadside ditches, 

other standing water, and wetlands (as shown on maps submitted as part 

of application) in Montgomery County. 

2. The methoprene, B.t.i., and B.s. will be used solely in the 

aforementioned waters and in strict adherence to the recommendations of 

the manufacturer. The application will be by spraying and broadcasting. 

3. The application of the methoprene, B.t.i., and B.s. will be supervised 

by Jeannine M. Dorothy, Entomologist, Maryland Department of 

Agriculture. 

4. This permit is valid for up to five full applications of methoprene, 

B.t.i., and B.s. between March 1 and October 15. 

5. There shall be no direct application of methoprene to Use III waters, 

headwater tributaries, or contiguous wetlands. Between March 1 and June 

15, there shall be no direct application of methoprene to documented 

anadromous finfish spawning areas or their contiguous wetlands. 

PRINCE GEORGE'S COUNTY

1. Approval is for the use of methoprene, B.t.i., and B.s. for mosquito 

control on a total of 3,941 acres of woodland pools, roadside ditches, 

other standing water, and wetlands (as shown on maps submitted as part 

of application) in Prince George's County. 

2. The methoprene, B.t.i., and B.s. will be used solely in the 
Cyrus R. Lesser, Chief 

Page 7 

aforementioned waters and in strict adherence to the recommendations of 

the manufacturer. The application will be by spraying and broadcasting. 

3. The application of the methoprene, B.t.i., and B.s. will be supervised 

by Jeannine M. Dorothy, Entomologist, Maryland Department of 

Agriculture. 

4. This permit is valid for up to five applications of methoprene, B.t.i., 

and B.s. between March 1 and October 15. 

5. There shall be no direct application of methoprene to Use III 

waters, headwater tributaries, or contiguous wetlands. Between 

March 15 and June 15, there shall be no direct application of 

methoprene to documented anadromous finfish spawning areas or 

their contiguous wetlands. 

6. Use of residual formulations of methoprene is prohibited in 

estuarine wetland areas. 

QUEEN ANNE'S COUNTY

1. Approval is for the use of methoprene, B.t.i., and B.s. for mosquito 

control on a total of 423 acres of woodland pools, roadside ditches, 

other standing water, and wetlands (as shown on maps submitted as part 

of application) in Queen Anne's County. 

2. The methoprene, B.t.i., and B.s. will be used solely in the 

aforementioned waters and in strict adherence to the recommendations of 

the manufacturer. The application will be by spraying and broadcasting. 

3. The application of the methoprene, B.t.i., and B.s. will be supervised 

by Daniel Schamberger, Environmental Specialist, Maryland Department of 

Agriculture. 

4. This permit is valid for up to five full applications of methoprene, 

B.t.i., and B.s. between March 1 and October 15. 

5. Between April 1 and June 15, there shall be no direct application 

of methoprene to documented anadromous finfish spawning areas or 

their contiguous wetlands. 

6. Use of residual formulations of methoprene is prohibited in 

estuarine wetland areas. 

ST. MARY'S COUNTY

1. Approval is for the use of methoprene, B.t.i., and B.s. for mosquito 

control on a total of 1,336 acres of woodland pools, roadside ditches, 

other standing water, and wetlands (as shown on maps submitted as part 

of application) in St. Mary's County. 

2. The methoprene, B.t.i., and B.s. will be used solely in the 

aforementioned waters and in strict adherence to the recommendations of 

the manufacturer. The application will be by spraying and broadcasting. 

3. The application of the methoprene, B.t.i., and B.s. will be supervised 

by Michael Cantwell, Entomologist, Maryland Department of Agriculture. 

4. This permit is valid for up to five full applications of methoprene, 

B.t.i., and B.s. between March 1 and October 15. 
Cyrus R. Lesser, Chief 

Page 8 

5. Between March 15 and June 15, there shall be no direct application 

of methoprene to documented anadromous finfish spawning areas or 

their contiguous wetlands. 

6. Use of residual formulations of methoprene is prohibited in 

estuarine wetland areas. 

SOMERSET COUNTY

1. Approval is for the use of methoprene, B.t.i., and B.s. for mosquito 

control on a total of 12,124 acres of woodland pools, roadside ditches, 

other standing water, and wetlands (as shown on maps submitted as part 

of application) in Somerset County. 

2. The methoprene, B.t.i., and B.s. will be used solely in the 

aforementioned waters and in strict adherence to the recommendations of 

the manufacturer. The application will be by spraying and broadcasting. 

3. The application of the methoprene, B.t.i., and B.s. will be supervised 

by Larry Beauchamp, Supervising Inspector, Mosquito Control, Maryland 

Department of Agriculture. 

4. This permit is valid for up to five full applications of methoprene, 

B.t.i., and B.s. between March 1 and October 15. 

5. Between March 1 and June 15, there shall be no direct application of 

methoprene to documented anadromous finfish spawning areas or their 

contiguous wetlands.

6. Use of residual formulations of methoprene is prohibited in 

estuarine wetland areas. 

TALBOT COUNTY

1. Approval is for the use of methoprene, B.t.i., and B.s. for mosquito 

control on a total of 4,620 acres of woodland pools, roadside ditches, 

other standing water, and wetlands (as shown on map submitted as part of 

application) in Talbot County. 

2. The methoprene, B.t.i., and B.s. will be used solely in the 

aforementioned waters and in strict adherence to the recommendations of 

the manufacturer. The application will be by spraying and broadcasting. 

 

3. The application of the methoprene, B.t.i., and B.s. will be 

supervised by Lawrence A. Lembeck, Entomologist, Maryland 

Department of Agriculture. 

4. This permit is valid for up to five full applications of methoprene, 

B.t.i., and B.s. between March 1 and October 15. 

5. Between March 1 and June 15, there shall be no direct application of 

methoprene to documented anadromous finfish spawning areas or their 

contiguous wetlands. 

6. Use of residual formulations of methoprene is prohibited in 

estuarine wetland areas. 

WASHINGTON COUNTY

1. Approval is for the use of methoprene, B.t.i., and B.s. for mosquito 
Cyrus R. Lesser, Chief 

Page 9 

control on a total of 39 acres of woodland pools, roadside ditches, 

other standing water, and wetlands (as shown on map submitted as part of 

application) in Washington County. 

2. The methoprene, B.t.i., and B.s. will be used solely in the 

aforementioned waters and in strict adherence to the recommendations of 

the manufacturer. The application will be by spraying and broadcasting. 

3. The application of the methoprene, B.t.i., and B.s. will be 

supervised by Michael A. Cantwell, Entomologist, Maryland 

Department of Agriculture. 

4. This permit is valid for up to five full applications of methoprene, 

B.t.i., and B.s. between March 1 and October 15. 

5. There shall be no direct application of methoprene to Use III 

waters, headwater tributaries, or contiguous wetlands. Between 

March 1 and June 15, there shall be no direct application of 

methoprene to documented anadromous finfish spawning areas or 

their contiguous wetlands. 

WICOMICO COUNTY

1. Approval is for the use of methoprene, B.t.i., and B.s. for mosquito 

control on a total of 633 acres of woodland pools, roadside ditches, 

other standing water, and wetlands (as shown on maps submitted as part 

of application) in Wicomico County. 

2. The methoprene, B.t.i., and B.s. will be used solely in the 

aforementioned waters and in strict adherence to the 

recommendations of the manufacturer. The application will be by 

spraying and broadcasting. 

3. The application of the methoprene, B.t.i., and B.s. will be 

supervised by Lawrence A. Lembeck, Entomologist, Maryland 

Department of Agriculture. 

4. This permit is valid for up to five full applications of 

methoprene, B.t.i., and B.s. between March 1 and October 15. 

5. Between March 1 and June 15, there shall be no direct application 

of methoprene to documented anadromous finfish spawning areas or 

their contiguous wetlands. 

6. Use of residual formulations of methoprene is prohibited in 

estuarine wetland areas. 

WORCESTER COUNTY

1. Approval is for the use of methoprene, B.t.i., and B.s. for mosquito 

control on a total of 6,959 acres of woodland pools, roadside ditches, 

other standing water, and wetlands (as shown on maps submitted as part 

of application) in Worcester County.

2. The methoprene, B.t.i., and B.s. will be used solely in the 

aforementioned waters and in strict adherence to the recommendations of 

the manufacturer. The application will be by spraying and broadcasting. 

3. The application of the methoprene, B.t.i., and B.s. will be supervised 

by Phil Brittingham, Supervising Inspector, Mosquito Control, Maryland 
Cyrus R. Lesser, Chief 

Page 10 

 Department of Agriculture. 

4. This permit is valid for up to five full applications of methoprene, 

B.t.i., and B.s. March 1 and October 15. 

5. Between March 1 and June 15, there shall be no direct application of 

methoprene to documented anadromous finfish spawning areas or their 

contiguous wetlands. 

6. Use of residual formulations of methoprene is restricted to storm water 

detention facilities and isolated woodland pools, neither of which is 

within or immediately next to estuarine aquatic habitat areas.

7. Use of residual formulations of methoprene is prohibited in estuarine 

wetland areas. 

GENERAL CONDITIONS

1. The use of methoprene briquets is prohibited in estuarine marsh areas. 

2. There shall be no applications of pesticides to natural waterways. 

This prohibition includes altered natural channels such as 

functioning public drainage association ditches. This prohibition 

does not apply to artificial conveyances such as roadside ditches 

and head-drainage storm water management impoundments. 

If you have any questions, please call me at (410) 537-3323. 

Sincerely, 

Edward Gertler 

Industrial Discharge Permits Division 

Water Management Administration 

Attachment 

cc: Ray Dintaman 

 Dennis Howard