Herbicidal composition

Abstract

At present, many herbicidal compositions have been developed and used, but they are not necessarily sufficient to control undesired plants such as weeds to be controlled in some cases, and a herbicidal composition having high activity has been desired. A herbicidal composition comprising flazasulfuron or its salt, and at least one herbicidal compound selected from the group consisting of imazapic, hexazinone, mesotrione and their salts, and a method for controlling undesired plants using it.

What is claimed is: 
     
         1 . A method for controlling undesired plants or inhibiting their growth, which comprises applying a herbicidal composition comprising (A) flazasulfuron or its salt and (B) mesotrione or its salt. 
     
     
         2 . The method composition according to  claim 1 , wherein the mixing ratio of (A) to (B) is from 1:1 to 1:20 by the weight ratio. 
     
     
         3 . The method according to  claim 1 , wherein the undesired plants are gramineae, compositae, leguminosae, caryophyllaceae, geraniaceae, labiatae, convolvulaceae, portulacaeae or polygonaeae. 
     
     
         4 . The method according to  claim 3 , wherein the undesired plants are wild oat ( Avena fatua  L.), annual bluegrass ( Poa annua  L.), guinea grass ( Panicum maximum  Jacq.), hairy fleabane ( Conyza bonariensis  (L.) Cronq.), horseweed (Erigeron  canadensis  L.), dandelion ( Taraxacum officinale  Weber), common ragweed ( Ambrosia artemisiifolia  L.), rostrate  sesbania  ( Sesbania rostrata  Bremek. & Oberm.), white clover ( Trifolium repens  L.), sticky chickweed ( Cerastium glomeratum  Thuill.), carolina geranium ( Geranium carolinianum  L.), henbit ( Lamium amplexicaule  L.), field bindweed ( Convolvulus arvensis  L.), common purslane ( Portulaca oleracea  L.), spotted knotweed ( Polygonum lapathifolium  L.) or green smartweed ( Polygonum scabrum  MOENCH). 
     
     
         5 . The method according to  claim 4 , wherein the undesired plants are annual bluegrass ( Poa annua  L.), hairy fleabane ( Conyza bonariensis  (L.) Cronq.), horseweed ( Erigeron canadensis  L.), henbit ( Lamium amplexicaule  L.), field bindweed ( Convolvulus arvensis  L.) or common purslane ( Portulaca oleracea  L.), spotted knotweed ( Polygonum lapathifolium  L.) or green smartweed ( Polygonum scabrum  MOENCH). 
     
     
         6 . The method according to  claim 5 , wherein the undesired plant is field bindweed ( Convolvulus arvensis  L.). 
     
     
         7 . The method according to  claim 1 , wherein the undesired plants are gramineae, leguminosae or convolvulaceae. 
     
     
         8 . The method according to  claim 7 , wherein the undesired plants are wild oat ( Avena fatua  L.), guinea grass ( Panicum maximum  Jacq.), rostrate  sesbania  ( Sesbania rostrata  Bremek. & Oberm.) or field bindweed ( Convolvulus arvensis  L.). 
     
     
         9 . A method for controlling undesired plants or inhibiting their growth, which comprises applying a herbicidally effective amount of (A) flazasulfuron or its salt and a herbicidally effective amount of (B) mesotrione and its salt, to the undesired plants or to a place where they grow. 
     
     
         10 . The method according to  claim 9 , wherein (A) is applied in an amount of from 10 to 50 g/ha, and (B) is applied in an amount of from 50 to 200 g/ha. 
     
     
         11 . The method according to  claim 9 , wherein the undesired plants are gramineae, compositae, leguminosae, caryophyllaceae, geraniaceae, labiatae, convolvulaceae, portulacaeae or polygonaeae. 
     
     
         12 . The method according to  claim 11 , wherein the undesired plants are wild oat ( Avena fatua  L.), annual bluegrass ( Poa annua  L.), guinea grass ( Panicum maximum  Jacq.), hairy fleabane ( Conyza bonariensis  (L.) Cronq.), horseweed ( Erigeron canadensis  L.), dandelion ( Taraxacum officinale  Weber), common ragweed ( Ambrosia artemisiifolia  L.), rostrate  sesbania  ( Sesbania rostrata  Bremek. & Oberm.), white clover ( Trifolium repens  L.), sticky chickweed ( Cerastium glomeratum  Thuill.), carolina geranium ( Geranium carolinianum  L.), henbit ( Lamium amplexicaule  L.), field bindweed ( Convolvulus arvensis  L.), common purslane ( Portulaca oleracea  L.), spotted knotweed ( Polygonum lapathifolium  L.) or green smartweed ( Polygonum  scabrum MOENCH). 
     
     
         13 . The method according to  claim 12 , wherein the undesired plants are annual bluegrass ( Poa annua  L.), hairy fleabane ( Conyza bonariensis  (L.) Cronq.), horseweed ( Erigeron canadensis  L.), henbit ( Lamium amplexicaule  L.), field bindweed ( Convolvulus arvensis  L.) or common purslane ( Portulaca oleracea  L.), spotted knotweed ( Polygonum lapathifolium  L.) or green smartweed ( Polygonum scabrum  MOENCH). 
     
     
         14 . The method according to  claim 13 , wherein the undesired plant is field bindweed ( Convolvulus arvensis  L.). 
     
     
         15 . The method according to  claim 9 , wherein the undesired plants are gramineae, leguminosae or convolvulaceae. 
     
     
         16 . The method according to  claim 15 , wherein the undesired plants are wild oat ( Avena fatua  L.), guinea grass ( Panicum maximum  Jacq.), rostrate  sesbania  ( Sesbania rostrata  Bremek. & Oberm.) or field bindweed ( Convolvulus arvensis  L.).