Plant protecting and regulating compositions – Plant growth regulating compositions – Plural active ingredients
Patent
1997-08-15
2000-08-01
Pak, John
Plant protecting and regulating compositions
Plant growth regulating compositions
Plural active ingredients
504129, 504131, 504132, 504133, 504134, 504135, 504136, 504137, 504138, 504139, 504140, 504141, 504142, 504143, 504144, 504145, 504146, 504147, 504148, A01N 4352, A01N 4354, A01N 4378, A01N 4300
Patent
active
060966874
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 of PCT/IB95/01059, filed on Nov. 27, 1995.
This invention relates to herbicidal compositions comprising a herbicidal sulfonylurea derivative and at least one co-herbicide selected from a range of co-herbicides. It further relates to the use of the aforesaid herbicidal compositions for controlling undesired vegetation in crops, especially cereal crops.
EP-A-0 477 808 discloses sulfonylurea derivatives of the general formula (I) ##STR2## wherein Q is --CH.dbd.CH-- or --S--, R is straight or branched C1-3 alkyl, and X is --OCH.sub.3 or CH.sub.3, or an agriculturally acceptable salt thereof. Examples of agriculturally acceptable salts include salts with inorganic bases such as alkali metal (e.g. sodium, potassium, etc.), alkali earth metal (e.g. magnesium, calcium, etc.) and ammonia as well as organic bases such as dimethylamine, triethylamine, pyrrolidine, piperidine, piperazine, morpholine, benzylamine, ethanolamine, and diethanolamine. The said herbicidal sulfonylurea derivatives are said to present advantageous activity against broadleaf weeds and graminaceous weeds without adverse effects on valuable small grain cereal crop particularly wheat.
The aforesaid sulfonylurea derivatives do not readily control all the weed species encountered in small grain cereal crops in practice. More particularly weeds such as, for example: are used. These high rates may then be detrimental to the crops and, of course, reduce the commercial value of the sulfonylurea derivatives. Moreover, environmental considerations increasingly require that lower amounts of herbicidally active substances be used in the control of undesired vegetation.
It is known to overcome this type of problem to some extent by the use of herbicidal compositions in which more than one type herbicide is present. Such compositions, however, should preferably still show the advantageous properties of the individual herbicide constituents and display a synergistic effect between them, whilst maintaining selectivity of herbicidal action with respect to the crop. It is, nonetheless, difficult to determine appropriate combinations of herbicides in view of the considerable number of different types of herbicides available and the plurality of individual herbicides within each such type.
The purpose of the present invention is to provide herbicidal compositions comprising a sulfonylurea derivative as defined above and at least one co-herbicide, said compositions having a broader spectrum of weed control than each individual herbicide constituent, whilst retaining the selectivity of herbicidal action of the sulfonylurea derivative constituent.
A further purpose of the present invention is to provide herbicidal compositions which, when applied pre-emergent or post-emergent, display an enhanced and broader spectrum of herbicidal activity than the sulfonyl urea derivatives used alone, whilst retaining the selectivity of action of the herbicidal action of the sulfonylurea derivatives defined above with regard to the crops being treated.
A further purpose of the present invention is to provide a method of controlling the germination and growth of undesired vegetation in a selective manner with regard to crops, e.g. cereal crops, being treated, which comprises applying to the crop, pre- or post-emergent, a composition according to the present invention.
It is surprising that the compositions of the present invention comprising a sulfonylurea herbicide as defined and at least one co-herbicide are particularly efficient in combating a broad spectrum of weeds while still displaying a selectivity of action with respect to the crops. It is further surprising that the compositions of the present invention additionally exhibit synergistic effects.
According to the present invention there are provided herbicidal compositions comprising a sulfonylurea derivative of formula (I) as defined above and at least one co-herbicide selected from: arenecarboxylic acid herbicides, pyridinecarboxylic acid herbicides, and action with respect to crops being treated
Monsanto Company
Pak John
White Carter J.
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