General Information


Lorsban-4E insecticide is an emulsifiable concentrate for use in listed crops. This product resists washoff once it is dry. Target pests and a p plication rates are provided in the accompanying tables.

Use Precautions and Restrictions

Insect control may be reduced at low spray volumes under high temperature and wind conditions.

Some reduction in insect control may occur under unusually cool conditions.

Flood irrigation: To avoid contamination of irrigation tail waters, do not flood irrigate within 24 hours following a soil surface or foliar application of L orsban-4E.

Do not aerially apply this product in Mississippi.

Insecticide Resistance Management (IRM)

Lorsban-4E contains a Group 1B insecticide. Insect/mite biotypes with acquired resistance to Group 1B may eventually dominate the insect/mite population if Group 1B insecticides are used repeatedly in the same field or in successive years as the primary method of control for targeted species. This may result in partial or total loss of control of those species by Lorsban-4E or other Group 1B insecticides.

To delay development of insecticide resistance:

- Avoid consecutive use of insecticides with the same mode of action (same insecticide group) on the same insect species.

- Use tank mixtures or premix products containing insecticides with different modes of action (different insecticide groups) provided the products are registered for the intended use.

- Base insecticide use upon comprehensive Integrated Pest Management (IPM) programs.

- Monitor treated insect populations in the field for loss of effectiveness.

- Contact your local extension specialist, certified crop advisor, and or manufacturer for insecticide resistance management and/or IPM recommendations for the specific site and resistant pest problems.

- For further information or to report suspected resistance, you may contact Dow AgroSciences by calling 800-258-3033.

Application Directions

Broadcast Foliar Application

Apply with conventional power-operated spray equipment using nozzles and spray pressures specified for insecticides. Apply Lorsban-4E in a spray volume of not less than 2 gallons per acre (gpa) for aerial application equipment (fixed wing or helicopter) or not less than 10 gpa for ground equipment, unless otherwise specified. Increase spray volume to ensure adequate coverage with increased density and height of crop canopy.

Ground Application: Orient the boom and nozzles so that uniform coverage is obtained. The swath width should not be wider than the boom. Follow nozzle manufacturer’s specifications for insecticide nozzles with respect to nozzle type, pressure, and spacing.

Broadcast Soil Application

Apply with conventional power-operated spray equipment that will apply the product uniformly to the soil surface. Use nozzles that produce medium or coarse droplets (255 to 400 microns). Unless otherwise indicated, a spray volume of 10 gpa or more is needed. For band application, use proportionally less spray volume.

Aerial Application

Use a minimum spray volume of 2 gpa. Mark swaths by mechanical flagging, permanent markers or use of GPS equipment.

Limitations, Restrictions, and Exceptions


Not for use in Mississippi

Postharvest Application

Apply as a directed spray to crown of strawberry plants immediately after harvest and after plants are topped. Repeat application, if required, 1 4 to 18 days later. Use a minimum spray volume of 100 gpa.

Specific Use Precautions:

- Do not tank mix Lorsban-4E with pesticides, surfactants, or fertilizer formulations unless prior use has shown the combination non-injurious under your current conditions of use.

- Phytotoxicity may occur when Lorsban-4E is applied to strawberries under conditions of high temperature and drought stress.

Specific Use Restrictions:

Postharvest Application: Do not sprinkle irrigate for one week

following application.

- Maximum single application rate is 2 lb ai chlorpyrifos (2 quarts of Lorsban-4E) per acre for preplant incorporation and 1 lb ai chlorpyrifos (1 quart of Lorsban-4E) per acre for foliar and postharvest application.

- Do not make a second application of Lorsban-4E or other product containing chlorpyrifos within 10 days of the first foliar application and within 14 days of postharvest application.

- For prebloom use only. Do not apply after berries start to form or when berries are present.

Pre-Harvest Interval

21 days

Restricted Entry Interval

24 hours

Exception: If the product is soil-injected or soil-incorporated, the Worker Protection Standard, under certain circumstances, allows workers to enter the treated area if there will be no contact with anything that has been treated.


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