Classifications

• • A—HUMAN NECESSITIES
  • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
  • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
  • A01N47/00—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom not being member of a ring and having no bond to a carbon or hydrogen atom, e.g. derivatives of carbonic acid
  • A01N47/08—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom not being member of a ring and having no bond to a carbon or hydrogen atom, e.g. derivatives of carbonic acid the carbon atom having one or more single bonds to nitrogen atoms
  • A01N47/10—Carbamic acid derivatives, i.e. containing the group —O—CO—N<; Thio analogues thereof
  • A01N47/16—Carbamic acid derivatives, i.e. containing the group —O—CO—N<; Thio analogues thereof the nitrogen atom being part of a heterocyclic ring

Definitions

• This invention pertains to synergistic herbicidal combinations, particularly such combinations for use in controlling weeds in a rice crop.
• Molinate (S-ethyl hexahydro-lH-azepine-1-carbothioate) is a thiocarbamate herbicide which has been used to control weeds in rice crops for a number of years, and is generally sold under products bearing the trademark ORDRAM®.
• molinate is applied pre-plant, pre-flood or post-flood to control a wide range of weeds in rice crops, and is generally applied at rates ranging from about 500 to about 11 ,000 g/ha.
• Oxyfluorfen or 2-chloro-l-(3-ethoxy-4-nitrophenoxy)-4-(trifluoromethylbenzene) is a diphenyl ether herbicide sold primarily under the trademark GOAL®.
• oxyfluorfen is sold for control of weeds in fruit, nut and vegetable crops, and in cotton. It is not usually used for control of weeds in rice crops because the rate of application needed to control weeds tends to cause unacceptable damage to the rice.
• Oxyfluorfen is used, however, in China on a small scale to control weeds in rice.
• oxyfluorfen in an amount which produces substantially no phytotoxicity to a rice crop, in combination with molinate, particularly a lesser amount or lower application rate of molinate than is normally used, produces a synergistic effect, resulting in good control of weeds in rice crops in either pre-flood or post-flood applications.
• This invention comprises a herbicidal composition as well as a method of controlling weeds in rice crops.
• this invention relates to a synergistic herbicidal composition comprising molinate and oxyfluorfen.
• it comp ⁇ ses a herbicidal composition comp ⁇ sing molinate and oxyfluorfen in a weight ratio of from about 500 1 to about 30 1 , respectively
• this invention comprises a method of controlling weeds in a ⁇ ce crop comprising applying to said crop, said weeds or the locus of either or both, a synergistic combination comp ⁇ sing molinate and oxyfluorfen, preferably in a weight ratio of from about 500 1 to about 30 1, respectively
• the invention involves the use of the combination of the herbicides molinate and oxyfluorfen to control weeds in a ⁇ ce crop
• the combination within the scope of this invention, demonstrates synergistic effects, that is effects that would have been unexpected from the performance of the two herbicides individually against the same weeds under similar circumstances
• weeds are controlled in the presence of a ⁇ ce crop by treating the crop, the weeds, or the locus of either or both, with a herbicidally effective amount of a synergistic combination of the herbicides molinate and oxyfluorfen
• a synergistic combination of the herbicides molinate and oxyfluorfen in general, we have found that synergy is demonstrated when the combination includes these two herbicides, respectively, in a weight ratio of from about 500 1 to about 30 1 , preferably, from about 250 1 to about 40 1
• Applicants' discovery is that of synergism between molinate and oxyfluorfen, and is not necessarily limited to combinations of these herbicides within these weight ratios, as synergy may exist at others
• the combination produces synergistic or unexpected control of weeds in ⁇ ce when applied at the va ⁇ ous times, and to ⁇ ce planted in different ways
• the combination may be applied p ⁇ or to planting, after planting but p ⁇ or to flooding (pre-flood, post- emergence) or after emergence of the ⁇ ce and flooding (post-flood, post-emergence) and may be applied to either direct seeded or transplanted rice
• the two herbicides, molinate and oxyfluorfen be applied in a physically combined form, or even at the same time
• the combination effect results so long as the two herbicides are present at the same time in the rice crop, regardless of when they were applied
• a physical combination of the two herbicides could be applied, or one could be applied earlier than the other
• one of the two herbicides could be applied even prior to planting the rice in a controlled release formulation such as a microencapsulated formulation, and the other applied subsequently in a conventional liquid or solid formulation, so long as the earlier-applied herbicide is still present in the soil when the second is applied, and so long as the weight ratio of available herbicides falls within that disclosed and claimed herein.
• Either herbicide could thus be applied in liquid or solid form, or a combination product containing both herbicides could be produced, again, in either liquid or solid form.
• Typical liquid formulations include emulsions, suspensions (including suspensions containing. microcapsules), solutions, emulsifiable concentrates, and flowables.
• Solid products include forms such as granules, wettable powders, water-dispersible solid products (including water-dispersible granules containing microencapsulated pesticides) or dusts.
• compositions will generally contain, in addition to the active herbicide, other ingredients such as solvents, wetting agents, suspending agents, anti-caking agents, dispersing agents, emulsifiers, antifreeze agents, antifoam agents, and other additives.
• other ingredients such as solvents, wetting agents, suspending agents, anti-caking agents, dispersing agents, emulsifiers, antifreeze agents, antifoam agents, and other additives.
• Either herbicide, or both may be utilized in one of a number of known forms of controlled release compositions.
• Such compositions provide relatively slow or controlled release of the active ingredient into the environment and include, for example, encapsulations, microencapsulations, and various forms of controlled release granules.
• Combination products or compositions according to this invention may contain the two herbicides in numerous different physical forms.
• a combination product may be produced by simply physically mixing ("tank-mixing") commercially available products containing the active herbicides, for example, two emulsifiable concentrates containing the herbicides, so long as all the ingredients of the two products are relatively compatible.
• a package may be manufactured and sold which contains, overall, the two herbicides in separate containers, but packaged together, commonly termed a "twin-pack".
• a twin-pack is particularly suitable for the herbicidal compositions herein, since the amount of molinate is substantially greater than that of oxyfluorfen, so that an overall product package can be produced containing a relatively large container of a molinate-containing herbicide product together with a relatively small container of an oxyfluorfen-containing herbicidal product.
• compositions containing the two herbicides can be produced.
• Molinate is a liquid and oxyfluorfen in a solid which is soluble in many organic solvents. For that reason, liquid compositions appear preferable for products containing the two herbicides.
• Typical liquid compositions would include an emulsifiable concentrate containing both herbicides, or a two-phase emulsion (or microemulsion) with one herbicide in each phase.
• both herbicides are currently also sold as solid formulations, that is, impregnated granules, so that a similar solid product containing both herbicides could likewise be produced, as impregnated granules.
• other solid formulations such as wettable powders or dusts could be prepared.
• microencapsulated products in which one or both herbicides are contained within a microcapsule and said microencapsulated products could be sold in either liquid form (i.e., capsule suspensions) or solid form (i.e., water-dispersible granules produced by drying of microcapsule suspensions).
• liquid form i.e., capsule suspensions
• solid form i.e., water-dispersible granules produced by drying of microcapsule suspensions.
• One type of liquid form would be a microcapsule suspension in which one of the herbicides is contained within the capsules while the other is present in a nonencapsulated form, in the continuous liquid phase.
• Another type would be a suspension containing molinate and oxyfluorfen separately encapsulated.
• the types of formulations or compositions which may contain these two herbicides is not limited by those enumerated herein, as other types of formulations would likely be envisaged by those skilled in the art.
• EXAMPLE 1 This example demonstrates application of the combination of molinate and oxyfluorfen for weed control applied post-flood/postemergence in transplanted rice.
• Rice was grown to the 2-4 leaf stage away separately from the trial tubs. The soil in the tub was flooded and tilled (puddled) until a blend was achieved. The rice plants were then transplanted into this blend. Weeds (2 leaf stage) were either grown separately and transplanted in or were grown in the tub on the blended soil.
• Herbicide application typically was made by injection or broadcasting of chemical after flooding.

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• Life Sciences & Earth Sciences (AREA)
• Agronomy & Crop Science (AREA)
• Pest Control & Pesticides (AREA)
• Plant Pathology (AREA)
• Health & Medical Sciences (AREA)
• Engineering & Computer Science (AREA)
• Dentistry (AREA)
• General Health & Medical Sciences (AREA)
• Wood Science & Technology (AREA)
• Zoology (AREA)
• Environmental Sciences (AREA)
• Agricultural Chemicals And Associated Chemicals (AREA)

Applications Claiming Priority (3)

Publications (1)

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• 1998
  • 1998-08-27 EP EP98940400A patent/EP1009234A1/de not_active Withdrawn
  • 1998-08-27 JP JP2000508248A patent/JP2001514196A/ja not_active Ceased
  • 1998-08-27 CN CN 98808804 patent/CN1237877C/zh not_active Expired - Fee Related
  • 1998-08-27 WO PCT/GB1998/002574 patent/WO1999011131A1/en active IP Right Grant
  • 1998-08-27 AU AU88733/98A patent/AU753747B2/en not_active Ceased
  • 1998-08-27 BR BRPI9811439-5A patent/BR9811439B1/pt not_active IP Right Cessation
  • 1998-08-27 EA EA200000276A patent/EA002152B1/ru not_active IP Right Cessation
  • 1998-08-27 KR KR10-2000-7001855A patent/KR100511847B1/ko not_active IP Right Cessation
  • 1998-09-02 MY MYPI9804009 patent/MY116605A/en unknown

Non-Patent Citations (1)

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