MRC-04 (5-((2,6-difluorobenzyloxy)methyl)-4,5-dihydo-5-methyl-3-O-tolylisoxazole) is an analogue of the new turf herbicide methiozolin developed by Moghu Research Center.  Herbicidal activity was evaluated under paddy conditions in glasshouse and field in Daejoen, Korea in 2013. Soil applied MRC-04 demonstrated potent herbicidal efficacy against susceptible and ALS-resistant barnyardgrass (Echinochloa oryzoides) at 3 leaf stage at 300 g a.i. ha-1 and good safety to transplanted rice (Oryza sativa) at 600 g a.i. ha-1 in greenhouse. Rice phytotoxicity under different transplanting depth (1 vs. 4 cm) and irrigation depth of water (1 vs. 5 cm) was similar. Tank mixed MRC-04 (300 g a.i. ha-1) with ALS inhibiting rice herbicides, flucetosulfuron (25 g), pyrazosulfuron-ethyl (21 g), imazosulfuron (75 g), or penoxulam (24 g), showed excellent control efficacy to both susceptible and ALS-resistant barnyardgrass at 2.5 leaf stage without rice phytotoxicity at 300 g a.i. ha-1. In the paddy field, MRC-04 soil applied at 0, 10, or 15 days after transplanting (DAT) completely controlled barnyardgrass at 150 g (0 DAT) or 300 g a.i. ha-1 (10 and 15 DAT); however, rice phytotoxicity was acceptable at 600 g (0 DAT) or 900 g a.i. ha-1 (10 and 15 DAT). The results suggest that MRC-04 is an excellent rice herbicide candidate especially controlling resistant barnyardgrass without rice damage.

Herbicidal efficacy of MRC-04 under paddy conditions

248th National Meeting (2014)

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