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Methidathion

General Information

• Chemical Class: Organophosphate insecticide
• Uses: Almonds, apples, apricots, artichokes, carambola, cherries, cotton, grapefruit, kiwifruit, lemons, longan, mandarin, mango, nectarines, olives, oranges, peaches, pears, pecans, plums and prunes, safflower, sugar apple, sunflower and walnuts, alfalfa and clover seed, grass hay, tobacco, and ornamental plants and shrubs for broad control of insects.
• Alternatives: Organic Agriculture
• Beyond Pesticides rating: Toxic

Health Effects

• EPA Acute Toxicity Class: I (highly toxic)
• Cancer: Possible (8)
• Endocrine Disruption: Not documented
• Reproductive Effects: Not documented
• Neurotoxicity: Yes (8)
• Kidney/ Liver Damage: Not documented
• Sensitizer/ Irritant: Yes (4)
• Birth/ Developmental Defects: Not documented

Environmental Effects

• Detected in Groundwater: Not documented
• Detected in Streams: Not documented
• Potential Leacher: Not documented
• Toxic to Birds: Yes (8)
• Toxic to Fish/ Aquatic Organisms: Yes (8)
• Toxic to Bees: Yes (8)
• Toxic to Mammals: Yes (8)
• Long-Range Transport: Not documented

Additional Information

• Regulatory Information:
  • Cancellation Order for Pesticide Registrations: Methidathion (6/2010)
  • EPA Reregistration Eligibility Decision (RED) signed (7/2006)
• Supporting information:
• Extoxnet Methidathion Factsheet (Extension Toxicology Network)
• PAN Pesticides Database - Methidation (Pesticide Action Network)