BIOLOGICAL-ACTIVITY OF THE NEW HERBICIDE LGC-40863 (BENZOPHENONE IS[(4,6-DIMETHOXY-2-PYRIMIDINYL)OXY]BENZOYL]OXIME)

Herbicidal characteristics of the experimental compound LGC-40863 (ISO proposed common name: pyribenzoxim) were investigated in greenhouse a nd field. In the greenhouse, LGC-40863 had strong post-emergent activi ty on various grass and broadleaf weeds including Echinochloa crus-gal li L. Beauv., Alopecurus myosuroides Huds. and Polygonum hydropiper L. , while it was safe in rice (Oryza sativa L.), wheat (Triticum aestivu m 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 field, LGC-40863 prov ided excellent control of E. crus-galli (>95%) at 30 to 40 g ha(-1) wh en 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.