Efficacy of Rinskor™ (florpyrauxifen-benzyl ester) on Herbicide Resistant Barnyardgrass (Echinochloa crus-galli) in Rice Fields of Mekong Delta, Vietnam
2018
Duy, Le | Chon, NguyenM. | Mann, RichardK. | Kumar, BobbaV. N. | Morell, MauricioA.
Barnyardgrass (Echinochloa crus-galli) seed samples were collected in rice fields in different locations at Mekong delta in Vietnam for herbicide resistance tests. The ALS-resistant and synthetic auxin-resistant E. crus-galli were confirmed at several locations in the Mekong Delta. The average LD₉₀ value of bispyribac, penoxsulam and quinclorac for assessed weed populations was 33.1, 15.1 and 550.2 g a.i.ha⁻¹ respectively. There were cross resistant barnyardgrass populations to bispyribac and penoxsulam, the LD₉₀ value of the two ALS inhibitors for E. crus-galli was positively correlated at R²=0.39, the cross resistant population was 33.3% of total sample. The correlation analysis was not useful to evaluate the multiple resistance between quinclorac and the two ALS inhibitors, the R² value was lower than 0.05, however, the percentage of multiple resistance weed was 36.2% of population. There was no cross resistance or multiple resistance among the 3 tested herbicides and the new synthetic auxin herbicide Rinskor™. All tested weed samples, including quinclorac-resistant populations, were effectively controlled by Rinskor™. There was no difference between control from Rinskor™ in the different herbicide resistant populations. Average LD₉₀ value of Rinskor™ in all tested barnyardgrass was 17.1 g a.i ha⁻¹.
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