Table 2: Key physicochemical properties for florpyrauxifen-benzyl active constituent Off-white powder at 21.1 °C (99. 4%) Tan powder at 21.1 oC (96.4 %) DENSITY: 1.46 g/cm3 (20 oC) Mild odour 137.07 °C pH 6.58 at 23.4 ºC (1% w/w dispersion in distilled water) (KOW): pH 5 (log10Pow = 5.4 ± 0.1) pH 7 (log10Pow = 5.5 ± 0.04) pH 9 (log10Pow = 5.5 ± 0.1) 4.6 10-5 Pa at 25 C and 3.2 10-5 Pa at 20 C. 20 Purified water: 0.015 mg/L pH 5 buffer solution: 0.014 mg/L pH 7 buffer solution: 0.011 mg/L pH 9 buffer solution: 0.012 mg/L 20 Acetone 210 g/L Methanol 13 g/L 1,2-dichloroethane 95 g/L Xylene 14 g/L n- heptane 0.053 g/L n-octanol 4.9 g/L Ethyl acetate 120 g/L 0.202 g/mL at 23.4 °C 0.320 g/mL at 23.4 °C 25 pH 4 DT50 = 913 days pH 7 DT50 = 111 days pH 9 DT50 = 1.3 days Not highly flammable Not observed up to the maximum test temperature (400 ºC) Not oxidising Stable to normal and elevated temperatures, and in the presence of common metals and metal ions RATE STORAGE
Animal commodity MRLs Table 5 shows the predicted residue contribution from rice forage used as feed for livestock. Table 5: Predicted residue contribution from rice forage used as feed for livestock 500 20 DM (%) (%) Rice forage 2.40* HR 100 2.40 20 48 2.4 Total 100 2.4 Highest observation in forage (3.28 mg/kg at a 6 day WHP after two applications at 59.7 and 61.6 g a.i./ha, Site 140904) converted to expected residues (2.40 mg/kg) at the highest proposed application rate of 45 g a.i./ha. A dairy cattle feeding study was submitted. Four treatment groups of four dairy cows each were dosed orally for 28 consecutive days with florpyrauxifen-benzyl. The average dose levels of florpyrauxifen-benzyl based on concentration in the diet (DM feed basis) were 2.58 ppm, 13.1 ppm, 23.9 ppm and 110.8 ppm. For beef and dairy cattle the estimated maximum livestock burden for florpyrauxifen-benzyl is 2.40 ppm, based on a diet of 100% rice forage. The predicted residues of florpyrauxifen-benzyl in the milk and tissues of cattle fed with a 2.4 ppm dietary burden are shown in Table 6 Table 6: Predicted residues of florpyrauxifen-benzyl in the milk and tissues + XDE-848 2.58 <0.02 <0.02 <0.02 <0.02 <0.02 2.40 – beef and dairy, estimated burden <0.02 <0.02 <0.02 <0.02 - Recommended MRLs *0.02 *0.02 *0.02 *0.02
the higher rate where weeds are large or dense at spray time. Ensure floodwater is lowered sufficiently to expose 75% of weed foliage. See Water Management in General Instructions. WEEDS CONTROLLED WEED GROWTH STAGE (mL /ha) CRITICAL COMMENTS Arrowhead (Sagittaria calycina) Up to 4 leaf and not more than 5 cm across 100 See Water Management in GeneraL INSTRUCTIONS. Only treat small seedling weeds that are actively growing. Weeds larger than 5 leaf will not be controlled. Barnyard grass (Echinochloa crus-galli) Up to the 5 leaf stage and not more than 7 cm high Dirty dora submerged by floodwater will not be controlled by post-emergence treatment. Suppression: Dirty dora (Cyperus difformis) Up to 4 leaf stage and not more than 3 cm high Starfruit (Damasonium minus) Up to 4 leaf and not more than 5 cm across Water plantain (Alisma Table 2: WEEDS CONTROLLED OR SUPPRESSED IN RICE – SCWIIRT or Bickley boom (in-flood) application. DO NOT apply any later than panicle initiation (BBCH 30). Always use GF-3301 in sequence with foundation herbicide treatments having a different mode of action. Always apply with Uptake™ Spraying Oil, Hasten Spray Adjuvant or Loveland Products MSO with Leci-Tech Spray Adjuvant at 2–8 L/ha in total spray volume of 5–20 L/ha. Premix GF-3301 thoroughly in oil, then once fully dispersed, add remaining water to make up total spray mix volume. WEEDS CONTROLLED WEED GROWTH STAGE RATE (mL /ha) CRITICAL COMMENTS Arrowhead (Sagittaria calycina) Up to 4 leaf and not more than 5 cm across or high 150 See Water Management in GeneraL INSTRUCTIONS. A follow up treatment with a herbicide having a different mode of action may be required for complete control of weeds larger than label size or growth stage. Suppression: Dirty dora (Cyperus difformis) Up to 3 leaf stage and not more than 3 cm across or high Jerry Jerry (Ammania multiflora)