Aldrin/dieldrin, cancellation

Dieldrin [60-57-1] or l,2,3,4,10,10-hexachloro-l,4,4t ,5,8,8t -hexahydro-6,7-epoxy-l,4- <7o, Aro-5,8-dimethanonaphthalene (34) (mp 176°C, vp 0.4 mPa at 20°C) is formed from aldrin by epoxidation with peracetic or perben2oic acids. It is soluble in water to 27 / g/L. Aldrin and dieldrin have had extensive use as soil insecticides and for seed treatments. Dieldrin, which is very persistent, has had wide use to control migratory locusts, as a residual spray to control the Anopheles vectors of malaria, and to control tsetse flies. Because of environmental persistence and propensity for bio accumulation, registrations in the United States were canceled in 1974. 

In Hong Kong, the nine intentional POPs pesticides (aldrin, chlordane, DDT, dieldrin, endrin, heptachlor, HCB, mirex and toxaphene) targeted for global elimination or restricted production and use were not registered, or their registration status had been cancelled for many years due to toxicological or environmental concern. 

As mentioned earlier, registrations are for 15 years. However, the administrator of the EPA can cancel a registration or change the classification of the pesticide if he or she becomes aware of new data or other developments that would warrant such action. Because of the provisions, pesticide manufacturers must provide the EPA with any new adverse information. The use of many pesticides, including such insecticides as aldrin, chlordane, DDT, dieldrin, and heptachlor, has been cancelled or suspended. 

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