Lorsban™ 50W

Reliable, easy to use, effective control of a wide range of insect pests in a variety of crops.


  • Reliable: 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.
  • Effective: The unique three-way mode of action that works to control insect pests by contact, ingestion and inhalation of the vapour.
Lorsban 50W logo


Insects controlled
  • Black cutworm
  • Cabbage maggot
  • Darksided cutworm
  • Oriental fruit moth
  • Potato flea beetle
  • Red-backed cutworm
  • Seed-corn maggot
  • Strawberry cutworm
  • Tarnished plant bug

Crops & Crop Rotation

  • Broccoli
  • Brussels sprouts
  • Cabbage
  • Carrot
  • Cauliflower
  • Celery
  • Chinese cabbage
  • Cucumber
  • Field corn
  • Green pepper
  • Nectarine
  • Onion (excluding bunching onions)
  • Peach
  • Potatoes
  • Rutabaga
  • Strawberry
  • Sweet corn
  • Tobacco


Rate based on pest. See label for details.

When to Apply

Dependent on pest. Use as indicated on product label.


4 to 6 hours for foliar treatments. Soil treatments should not be applied if heavy rain is forecast.
Light rainfall during or after application is helpful.

Tank Mixes and Mixing Instructions

Tank mixes
  • No registered tank mixes.


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.

Grazing & Harvest

  • 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.

Application Guidelines

  • Ground application: 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).
  • Aerial application: Not registered for aerial application.