Crop & Pest Report

Accessibility


| Share

Chlorpyrifos Still Available for 2019 (05/23/19)

Chlorpyrifos (Trade names Lorsban 4E, Lorsban Advanced, Cobalt, Cobalt Advanced and several generic insecticides) belongs to the organophosphate group of insecticides, IRAC 1B.

Chlorpyrifos (Trade names Lorsban 4E, Lorsban Advanced, Cobalt, Cobalt Advanced and several generic insecticides) belongs to the organophosphate group of insecticides, IRAC 1B. This broad-spectrum neurotoxic insecticide has been used since 1965 for control of above ground and below ground insects and mites that feed on plant foliage and roots. The crop with the largest use of chlorpyrifos is corn in the U.S. Some examples of its uses in ND include:

  • Alfalfa – grasshoppers, leafhoppers, armyworms, cutworms, pea aphids, plant bugs
  • Dry beans – aphids, armyworms, bean leaf beetles, caterpillars, cutworms, grasshoppers, leafhoppers, seed corn maggots, spider mites
  • Field corn – cutworms, grubs, seed corn maggot, wireworm, grasshoppers, armyworms
  • Soybean – grasshoppers, Lepidoptera foliage feeders, armyworms, bean leaf beetles, cutworms, soybean aphids, spider mites
  • Sugarbeet – grasshoppers, spider mites, Lygus bugs, sugarbeet root maggots, aphids
  • Sunflower – cutworms, grasshoppers, banded sunflower moths, seed weevils, stem weevils, sunflower beetles, sunflower moths, Lygus bugs
  • Wheat – aphids, grasshoppers, army cutworm, cutworms, wheat midge, cereal leaf beetle

In addition, chlorpyrifos has played an important role as a ‘rotational’ use product for growers to delay the development of insecticide resistance for some insect pests, such as soybean aphids and spider mites.

For your review, the 9th Circuit Court of Appeals ordered the EPA to ban chlorpyrifos within 60 days on August 9, 2018. The Court’s reasoning for the ban was primarily due to the serious human health issues linked to chlorpyrifos. Next, the Department of Justice asked the 9th Circuit Court to reconsider its opinion. So far, the 9th Circuit Court has not responded yet.

When the 9th Circuit Court does respond, there will be a phase-out process, as products need to be reviewed by FIFRA, which takes time. It is impossible to predict the final fate of chlorpyrifos, but is still available for 2019.

Below is a link to EPA’s website on the status of chlorpyrifos:

www.epa.gov/ingredients-used-pesticide-products/chlorpyrifos#actions

 

Janet J. Knodel

Extension Entomologist

 

This site is supported in part by the Crop Protection and Pest Management Program [grant no. 2017-70006-27144/accession 1013592] from the USDA National Institute of Food and Agriculture. Any opinions, findings, conclusions, or recommendations expressed are those of the website author(s) and do not necessarily reflect the view of the U.S. Department of Agriculture.

USDA logo

Creative Commons License
Feel free to use and share this content, but please do so under the conditions of our Creative Commons license and our Rules for Use. Thanks.