Biological activity of the new herbicide LGC-40863 {benzophenone O-[2,6-bis[(4,6-dimethoxy-2-pyrimidinyl)oxy]benzoyl]oxime}

Abstract

: Herbicidal characteristics of the experimental compound LGC-40863 (ISO proposed common name : pyribenzoxim) were investigated in greenhouse and Ðeld. In the greenhouse, LGC-40863 had strong post-emergent activity on various grass and broadleaf weeds including Echinochloa crus-galli L. Beauv., Alopecurus myosuroides Huds. and Polygonum hydropiper L., while it was safe in rice (Oryza sativa L.), wheat (T riticum aestivum L.) and zoysiagrass (Zoysia japonica Steud ; (a turf species). Among important rice weeds, E. crus-galli was controlled over a wide window from the one-leaf to the six-leaf stages. In the Ðeld, LGC-40863 provided excellent control of E. crus-galli ([95%) at 30 to 40 g ha~1 when applied alone, or at 15 to 30 g ha~1 when applied in combination with pendimethalin, while it did not cause injury to rice at up to 60 g ha~1. These results suggest that LGC-40863 has potential as a new selective postemergent herbicide in rice.

In vivo pharmacokinetics of pyribenzoxim in rats

“…Pyribenzoxim {benzophenone O ‐[2,6‐bis(4,6‐dimethoxypyrimidin‐2‐yloxy)benzoyl]oxime; LGC‐40863}, which was developed by LG Chemical Ltd, Korea, is a new post‐emergence herbicide providing broad‐spectrum weed control in rice fields 1. 2 It has been used as a foliar‐applied herbicide in Korea for the control of weeds such as barnyard grass in dry‐seeded rice.…”

Multiple ALS Mutations Confer Herbicide Resistance in Waterhemp (Amaranthus tuberculatus)

“…Unfortunately, they also represent the group of herbicides with the greatest number of weed biotypes identified with resistance (Heap 2006). Despite widespread resistance to ALS inhibitors among weed species, there has been continued interest in developing and commercializing new ALS-inhibiting herbicides during the past 10 yr (Cho et al 1997;Feucht et al 1999;Hacker et al 1999;Kim et al 2003;Koo et al 1997;Larelle et al 2003;Lüthy et al 2001;Morrica et al 2001;Santel et al 1999).…”

7‐(4,6‐Dimethoxypyrimidinyl)oxy‐ and ‐thiophthalides as novel herbicides: Part 1. CGA 279 233: a new grass‐killer for rice

“…Therefore the pro‐pesticidal character of the new herbicide CGA 279 233 causes it to behave like a slow‐release form of the active ingredient over a reasonable time‐scale, giving sufficient safety to the crops plus a broad timing window offering application flexibility. Other commercialised compounds of type A , such as pyriminobac‐methyl (KIH‐6127)61 and pyribenzoxime (LGC‐40 863)62 are also of pro‐pesticidal character, but need (metabolic) activation for the break‐down of their weak O—N oxime bonds.…”