Effects of formulation types and application timing of benzobicyclon-mixture on weed control and phytotoxicity of rice

Abstract

: This study was conducted to evaluate the efficacy of two different formulations and application timings of benzobicyclon+penoxsulam+pyrzaosulfuron-ethyl (BPP) in rice field. BPP granule (GR) and tablet (TB) controlled more than 90% of four weed species 10 and 15 days after sowing in direct seeding when compared with untreated control. BPP TB was highly effective to control herbicide resistant Scirpus juncoides and Monochoria vaginalis both 10 and 15 days after transplanting (DAT). BPP GR controlled 94.0 and 96.5% of S. juncoides and M. vaginalis, respectively 10 DAT, but its efficacy decreased to 88.5 and 49.8% respectively 15 DAT. When compared with untreated control, no visual injuries were detected at 255 and 510 g a.i./ha of BPP. The yield of rice increased in both BPP GR and TB in transplanting and direct seeding rice cultivation when compared with untreated control. Based on these data, early application (10 DAT) of BPP GR and TB can be applied to provide effective weed control, especially in the field infested with herbicide resistant weed species.

Selectivity of Tefuryltrione between Rice and Eleocharis kuroguwai

“…Among many different modes of action, inhibitors targeting HPPD drew many attentions since successful commercialization of mesotrione for maize. These HPPD inhibitor herbicides have been known to control many ALS inhibitor resistant weeds such as Schoenoplectus juncoides (synonym-Scirpus juncoides) and Monochoria vaginalis (Park et al, 2012;Won et al, 2013). Unlike other HPPD inhibitors, tefuryltrione is known to show good herbicidal efficacy against Eleocharis kuroguwai (Personal communication with Bayer CropScience).…”