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metolachlor(Dual)Herbicide Profile 2/85 <br /> Page 2 of 5 <br /> DERMAL: LDNX/ >3170 mg/kg (rat) ; slight irritaemoto skin <br /> of rabbits (62) . <br /> LD50 = >10,000 mg/kg (rabbit, Dual 6E) (54) <br /> .� ORAL: LD50 = 2780 mg tech./kg (rat) (62) <br /> LD50 = 4286 mg/kg (male rat) ; 2828 mg/kg (female <br /> rat) (Dual 6E) (54) . <br /> r. INHALATION: LC50 = >1750 mg/l air (rat, 4-hour exposure) <br /> (technical) ; >247 mg/l air (rat, 4-hour exposure) <br /> (Dual 6E) (54) . <br /> low EYES: Non-irritant to eyes (rabbit) (62) <br /> Moderatelyirritating g (rabbit, Dual 6E) (54) . <br /> B. SUBACUTE AND CHRONIC TOXICITY: <br /> bm In 90-day feeding trials NEL was: for rats 1000 mg/kg diet <br /> (c. 90 mg/kg daily) ; for dogs 500 mg/kg diet (c. 17 mg/kg daily) (62) . <br /> am IV. ENVIRONMENTAL CONSIDERATIONS <br /> LC50 (96 hr) is: for rainbow trout 2 mg/1; for carp 4.9 mg/1; <br /> for bluegill 15 mg/1. It is practically non-toxic to birds and <br /> .. honeybees (62) . <br /> 96-hour LC50 <br /> Fish species Metolachlor technical (ppm) <br /> Rainbow trout 2.0 <br /> Bluegill sunfish 15.0 <br /> Channel catfish 4.9 <br /> Guppy 8.6 <br /> 8-Day Dietary LC50 <br /> Bird species Metolachlor technical (ppm) <br /> Bobwhite quail >10,000 <br /> Mallard duck >10,000 (54) <br /> Metolachlor is more readily adsorbed to muck or clay soils than to <br /> soils of low clay and organic matter content. Organic matter is the <br /> main soil constituent determining the leaching behavior of metolachlor <br /> as it is rapidly absorbed by humic materials. High organic content <br /> soils have less metolachlor movement than comparative soils with less <br /> organic matter. When organic matter content approaches 2.0%, no <br /> significant leaching would be expected, even under heavy rainfall <br /> __•,A{�{.-...c. Tln_ ...}.,lo c�-..l�i+hli..- m ..�- ,l leoo �fFo.,�-o,i <br /> by soil particles or the mineral portion, leaching is inhibited by high <br /> clay and/or silt content. <br /> It has little, if any, lateral movement in the soil, other than <br /> being moved in physical association with soil particles. Thus, ground <br /> water contamination as a result of metolachlor leaching is highly <br /> unlikely. <br />.. Metolachlor is a nonpersistent compound in soil. Radio-labeled <br /> studies have shown a rapid decline of the parent compound and <br /> concurrent incorporation of the parent material and breakdown products <br /> into the soil humic material. By 12 weeks, about 5% is converted to <br /> CO2. <br /> There have been no significant adverse effects on soil <br /> microorganism populations from exaggerated metolachlor rates. <br /> Photolysis has been investigated in laboratory studies. Under <br /> optimum exposure conditions to natural sunlight, the half-life is <br /> approximately 8 days. Under field conditions, the half-life would be <br /> considerably greater following a preemergence application because of <br /> reduced exposure to sunlight resulting from soil topographic <br /> variability. Under certain conditions, volatility may be a significant <br /> http://pmep.cce.comell.edn/profiles/herb-growthreg/fatty-alcohol-monuron/metolac.../herb-Drof-metolachlnr hrm l n/'Ani7nn1 <br />