Chlorpyrifos has been widely used as an insecticide for various agricultural and non-agricultural applications. However, it's important to note that due to increasing concerns about its potential health and environmental impacts, the use of chlorpyrifos has been restricted or banned in many countries.

Here are some of the common applications of chlorpyrifos:

1. Agriculture: Chlorpyrifos was commonly used in agriculture to control a wide range of pests on crops such as corn, soybeans, citrus fruits, and many others. It has been effective in controlling insects like aphids, beetles, caterpillars, and mites.

2. Residential and Structural Pest Control: Chlorpyrifos has been used for pest control in and around residential areas and structures. It was employed to combat pests like ants, cockroaches, termites, and mosquitoes.

3. Forestry: Chlorpyrifos was applied in forestry to protect forests and timber from destructive insects.

4. Turf and Ornamental Management: Chlorpyrifos has been utilized in the management of pests on lawns, golf courses, ornamental plants, and nurseries.