Lorsban™ 50W is a broad-spectrum insecticide that provides effective and economical control of a wide range of insect pests on a variety of crops.

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Lorsban 50W insecticide provides reliable, easy to use, effective control of a wide range of insect pests in a variety of crops.

Broad-spectrum insecticide

Lorsban 50W is a broad-spectrum insecticide that provides effective and economical control of a wide range of insect pests on a variety of crops.


Active ingredient chlorpyrifos registered in 1965 and in market for nearly 50 years.

Easy to use

Apply as a liquid solution to the soil (for certain insects), or to foliage by either ground or aerial sprayers.


The unique three-way mode of action that works to control insect pests by contact, ingestion and inhalation of the vapour.


Below lists the crops that Lorsban 50W insecticide can be used on.


Broccoli (Brassica oleracea var. italica)

Brussels Sprouts

Brussels Sprouts (Brassica oleracea var. gemmifera)


Cabbage, Chinese (Unspecified) (Brassica rapa ssp. pekinensis)

Cabbage, Chinese Mustard (Gai Choy) (Brassica rapa ssp. nipposinica)

Cabbage, Chinese, Bok Choy (Brassica rapa ssp. chinensis)

Cabbage, Chinese, For Seed (Brassica rapa ssp. pekinensis)

Cabbage, Chinese, Napa (Brassica rapa ssp. pekinensis)


Carrot (Daucus carota ssp. sativus)


Cauliflower (Brassica oleracea var. botrytis)

Celeriac Celery Root

Celery Root (Apium graveolens var. rapaceum)


Corn, Field, For Forage, or Fodder (Zea mays ssp. mays)

Corn, Field, For Seed (Zea mays ssp. mays)

Corn, Field, For Silage (Zea mays ssp. mays)

Corn, Field, or Silage, Seed Treatment (Zea mays ssp. mays)

Corn, Field (Zea mays ssp. mays)

Corn, Sweet (Zea mays ssp. mays)

Corn, Sweet (Zea mays)

Grain Corn


Cucumber (Cucumis sativus var. sativus)


Nectarine (Prunus persica var. nucipersica)


Onion (Allium spp.)


Peach (Prunus persica)


Pepper, Bell, or Green (Capsicum annuum)


Potato (Solanum tuberosum ssp. Tuberosum)


Rutabaga (Brassica napus var. napobrassica)


Strawberry (Fragaria x ananassa)


Tobacco (Nicotiana tobacum)


Now registered in the following provinces:

  • Registered
  • Unregistered

Technical Specifications

  • Application Method
    Ground - Best results will be obtained when application is made during the early evening. Apply as a broadcast application in sufficient water to ensure thorough coverage of the foliage. Ensure uniform application. To avoid streaked, uneven or overlapped application, use appropriate marking devices. Coarse sprays are less likely to drift, so avoid combinations of pressure and nozzle type that will result in fine particles (mist).
  • Approved Use
    Refer to the Lorsban 50W label for complete use instructions.
    Refer to the Controlled Pests list for the full list of pests.
  • Rates
    Dependent on pest. Use as indicated on product label.
  • Application Timing
    Rainfast: 4 to 6 Hours for foliar treatments.
    Soil treatments should not be applied if heavy rain is forecast.
    Dependent on pest. Use as indicated on product label.
  • Mixing Instructions
    1) Lorsban mixes readily with water to form a suspension. Do not apply Lorsban with liquid fertilizer or oil as a carrier.
    2) Fill the spray tank 1/3 full of water. Activate the agitation system.
    3) Add the required number of water-soluble packets to the spray tank. Complete filling the spray tank while the water-soluble packets dissolve and the Lorsban disperses. Before beginning to spray, make sure the Lorsban has dispersed and the water-soluble packets have dissolved. Maintain sufficient agitation during both mixing and application to ensure uniformity of the spray mixture.
    4) Depending on the water temperature and degree of agitation, the water-soluble packets and Lorsban should be completely dispersed within approximately 5 minutes from the time they were added to the water.
    5) Lorsban contains a wetting agent. Do not use additional wetting agents, spreaders or stickers.
  • Herbicide Group

    Group 1B

  • Grazing

    •  Potatoes – Do not apply within 7 days of harvest.

    •  Strawberry – Do not apply within 20 days of harvest.

    •  Peach, nectarine – Do not apply within 21 days of harvest.

    •  Rutabaga – Do not apply within 30 days of harvest.

    •  Cabbage, Chinese cabbage, cauliflower, broccoli, Brussels sprouts – Do not apply within 32 days of harvest.

    •  Green pepper – Do not apply within 40 days of harvest.

    •  Carrot, cucumber, onion – Do not apply within 60 days of harvest.

    •  Celery, corn (field and sweet) – Do not apply within 70 days of harvest.


Labels (PDF)
Lorsban 50W Insecticide Label
Insecticide Lorsban 50W étiquette principale

Safety Data Sheets (PDF)
Lorsban 50W Insecticide SDS
Insecticide Lorsban 50W fiche signalétique

Additional Resource Material (PDF)
Horticulture Crop Protection Guide
Guide de Protection des Cultures

Before use and for complete product information, please read and follow label directions.

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