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Development of new pesticide interim standards

Development of new pesticide interim standards. Pesticides detected in Montana groundwater during 2011 testing. Dichlorprop-p. Detected in Helena and Billings, Dichlorprop targets post-emergent broadleaf weeds and brush (both annuals and perennials).

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Development of new pesticide interim standards

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  1. Development of new pesticide interim standards Pesticides detected in Montana groundwater during 2011 testing

  2. Dichlorprop-p • Detected in Helena and Billings, Dichlorprop targets post-emergent broadleaf weeds and brush (both annuals and perennials). • Used for weed control on residential lawns, sod farms, roadsides, industrial sites, rights-of-way, and forests. • The United States uses roughly 4 million pounds of dichlorprop-p annually. An estimated 60% of this is used on residential lawns . • Not used in agricultural applications.

  3. Dichlorprop-p a herbicide • The EPA classifies this compound as a toxin • (Class D). • Review of available data has derived a interim • human health standard of 0.3mg/L. • DEQ preliminary calculations have been • confirmed by EPA Region 8.

  4. Myclobutanil- a fungicide First detected in the Billings area, Myclobutanil is a fungicide. It has a number of food crop applications (grapes, strawberries and blueberries) and commercial or residential landscaping applications.

  5. Myclobutanil • The EPA considers it a toxin (class E) • Review of available data has derived a interim • human health standard of 0.2mg/L. • DEQ preliminary calculations have been • confirmed by EPA Region 8.

  6. Fipronil- an insecticide • Detected in several locations (Gallatin River, Missoula and Helena) Fipronil is used to control a variety of insects including ants, beetles, cockroaches, fleas, ticks, termites, mole crickets, thrips, rootworms, and weevils. • Fipronil may be found in turf products, seed treatments, pet care products, baits, and termite treatments • It is registered for use on commercial and residential turf. There are currently three tick and flea control products with fipronil for use directly on pets.

  7. Fipronil • The EPA does consider this compound a • carcinogen (class C). • Review of available data has derived a interim • human health standard of 0.001 mg/L. • DEQ preliminary calculations have been • confirmed by EPA Region 8.

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