Plant protecting and regulating compositions – Plant growth regulating compositions – Organic active compound containing
Patent
1998-05-08
2000-01-04
Clardy, S. Mark
Plant protecting and regulating compositions
Plant growth regulating compositions
Organic active compound containing
A01N 2530, A01N 5702
Patent
active
060109793
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a herbicidal composition and in particular to a glyphosate composition.
The term "glyphosate composition" is used herein to mean a herbicidal composition comprising an active ingredient N-phosphonomethylglycine or a herbicidally acceptable salt thereof.
Herbicidally active glyphosate compositions are well known and are commercially available in the form of the trimethylsulphonium, isopropylamine and other salts. Such compositions are generally applied to unwanted vegetation in the form of an aqueous formulation containing a variety of adjuvants including for example wetters or other surface-active agents, anti-freeze agents, dyes, dispersants, rheological agents, anti-foam agents and humectants. The activity of the glyphosate composition may be improved considerably by the careful choice of additives. The literature contains many hundreds of examples of different glyphosate formulations exhibiting a variety of properties and designed for a variety of purposes.
Glyphosate compositions are very effective in killing unwanted weeds to which they are applied. However the uptake of the glyphosate composition by the plant leaf surface is relatively slow. In consequence the composition may be washed off the leaf surface and the herbicidal effectiveness may be reduced or even lost if rain falls shortly after application of the composition (for example within 6 hours of application). This is a particular problem for example in tropical climates in which it is difficult to predict the occurrence of heavy rain showers. Glyphosate compositions have been produced which are claimed to give improved rainfastness, but the topic is poorly understood and the physical parameters involved are highly complex and may vary from species to species. It may for example be appropriate to provide a composition which generally improves rainfastness for most species but is relatively ineffective on particular individual species. One approach which has been studied is to seek to improve the rate of uptake of the glyphosate composition into the leaf surface with a view to minimising the susceptibility to rain. Such improved uptake is often only achieved however at the expense of localised tissue damage and reduced translocation. It is clearly important that improved rainfastness is not associated with a significant reduction in herbicidal activity in the absence of rain. It is therefore desired to provide a glyphosate composition combining good activity in the absence of rain with effective rainfastness.
The present invention seeks to provide herbicidally effective compositions having improved rainfastness, by which is meant that compositions of the present invention generally reduce the overall loss in herbicidal effectiveness resulting from a fall of rain within for example from 1 to 6 hours after application of the composition. Compositions of the present invention may also show enhanced activity as compared with known glyphosate compositions and advantage as compared with known compositions may be found in either one or in both of these effects.
According to the present invention there is provided a glyphosate composition comprising (i) N-phosphonomethylglycine or an agriculturally acceptable salt thereof, (ii) a alkylglycoside surfactant of formula (I): ##STR1## wherein R.sup.1 represents a C1 to C8 alkyl group, the sum of w+x+y+z is from 4 to 40 and R.sup.2 is hydrogen or a C1 to C6 alkyl group or a group of formula --R.sup.3 --N.sup.(+) R.sup.4 R.sup.5 R.sup.6 X.sup.- wherein R.sup.3 is a C1 to C6 alkylene group optionally substituted with hydroxy, R.sup.4, R.sup.5 and R.sup.6 are each alkyl groups wherein the total number of carbon atoms in R.sup.4, R.sup.5 and R.sup.6 is from 6 to 25 and X.sup.- is an agrochemically acceptable anion and (iii) an ethoxylated alcohol.
R.sup.1 preferably represents a C1 to C4 alkyl group for example methyl. The total number of ethylene oxide chains is represented by the sun of w+x+y+z. The sum of w+x+y+z is preferably 4 to 25. Preferably, w, x, y and z are each separately a
REFERENCES:
patent: 4264478 (1981-04-01), Seldner
patent: 4528106 (1985-07-01), Grolitzer
patent: 5258359 (1993-11-01), Kassebaum et al.
patent: 5612285 (1997-03-01), Arnold
patent: 5888934 (1999-03-01), Townson et al.
Bean Michael John
Osborn Martin Keith
Wikeley Philip Simon
Clardy S. Mark
LeCroy David P.
Zeneca Limited
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