Peanuts |
208 g ai/ha |
Soybeans |
138-208 g ai/ha |
Ornamentals, trees, shrubs |
167 kg/ha (BroadStar); 0.56-0.84 kg/ha (SureGuard) |
Vines |
600 g ai/ha |
Sugar cane |
210-280 g/ha (6-8oz/acre, max 12 oz/acre per season) |
Ecotoxicology:
Mallard duck: LD50 >2,250 mg/kg practically non-toxic;Rainbow trout [96 h]:LC50 = 2.3 mg/L moderately toxic;Bobwhite quail:LD50 >2,250 mg/kg practically non-toxic;Bluegill sunfish [96 h]:LC50 >21 mg/L slightly toxic;Honey bee: LC50 >105 μg/bee practically non-toxic;Daphnia pulex[96 h]: LC50 = 5.5 mg/L moderately toxic;Small mammals:LD50 >5000 mg/kg practically non-toxic;Sheepshead minnow [96 h]: LC50 >4.7 ppm moderately toxic;Eastern oyster [96 h]:LC50/EC50 =2.4 ppm moderately toxic;Mysid shrimp [96 h]:LC50/EC50 =0.23 ppm highly toxic
Environmental fate:
Fate in :
Flumioxazin is highly toxic to terrestrial plants; in seedling emergence studies lettuce is the most sensitive species (90 g ai/ha), with cucumber being the most sensitive in vegetative vigour studies (90 g ai/ha).
Fate in soil:
Flumioxazin degrades rapidly in soils. Degradation is primarily due to microbial action (DT50 11.9 – 17.5 days (average 14.7 days) in aerobic soil) but hydrolysis and photolysis of the molecule also occurs; flumioxazin has a photolytic half-life of 3.2 to 8.4 days (average 5.8 days).
In unaged leaching studies, flumioxazin was found to be moderately mobile whilst in aged leaching studies it was generally not found at a depth greater than 3 inches.
Fate in aquatic systems:
Flumioxazin is rapidly degraded in water by both photolysis (DT50 1 day at pH 5) and hydrolysis; it has a half-life of 4.2 days at pH 5, 1 day at pH 7 and 0.01 days at pH 9. Due to its instability, it is unlikely that flumioxazin will leach to groundwater. However, the potential for the degradation products APF and THPA to leach to groundwater is high. The mobility of the major degradation product, 482-HA, detected in the hydrolysis study and of the unidentified residues in the photolysis and anaerobic aquatic metabolism studies is unknown. The residues may persist in the environment and may leach to groundwater. It is possible that flumioxazin could reach surface water via spray drift or runoff under certain environmental conditions and so should not be applied where run-off is likely to occur.
Despite the potential for acute dietary exposure to flumioxazin in drinking water, the EPA does not expect flumioxazin to pose any significant health risks. The Estimated Environmental Concentrations (EECs) were 2.4 ppb for surface water and 6.3 ppb for ground water for the acute scenario. For the chronic scenario, the EEC was 0.67 ppb for surface water and 6.3 ppb for groundwater. These values were less than the lowest drinking water level of concern (DWLOC) values of 90 ppb for acute and 70 ppb for chronic exposure.
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