Plant protecting and regulating compositions – Plant growth regulating compositions – Plural active ingredients
Reexamination Certificate
2001-04-17
2004-01-13
Clardy, S. Mark (Department: 1616)
Plant protecting and regulating compositions
Plant growth regulating compositions
Plural active ingredients
C504S128000, C504S130000, C504S139000
Reexamination Certificate
active
06677276
ABSTRACT:
This application is a 371 of PCT/EP99/05798 filed Aug. 10, 1999.
The invention relates to the field of the crop protection products which can be employed against harmful plants in tolerant or resistant crops of oil-seed rape and which comprise a combination of two or more herbicides as herbicidally active ingredients.
The introduction of tolerant or resistant oil-seed rape varieties and lines, in particular transgenic oil-seed rape varieties and lines, leads to the conventional weed control system being complemented by novel active ingredients which are nonselective per se in conventional oil-seed rape varieties. The active ingredients are, for example, the known broad-spectrum herbicides such as glyphosate, sulfosate, glufosinate, bilanafos (bialophos) and imidazolinone herbicides [herbicides (A)], which can now be employed in the tolerant crops developed for each of them. The efficacy level of these herbicides against harmful plants in tolerant crops is high, but, similarly as in the case of other herbicide treatments, depends on the nature of the herbicide employed, the application rate, the formulation in question, the harmful plants to be controlled in each case, the climatic and soil conditions and the like. Furthermore, the herbicides exhibit weaknesses (gaps) with regard to specific harmful plant species. Another criterion is the duration of action or the rate of degradation of the herbicide. Other factors which must be taken into account, if appropriate, are changes in the sensitivity of harmful plants, which may occur localized or upon prolonged use of the herbicides. Losses of action in individual plants can only be compensated for to some extent by increasing the application rates of the herbicides, if at all. Furthermore, there is always a need for methods for achieving the herbicidal action with a lower application rate of active ingredients. Not only does a lower application rate reduce the active ingredient quantity required for application, but, as a rule, it also reduces the quantity of formulation aids required. Both reduce the economic input and improve the ecological tolerance of the herbicide treatment.
A possibility of improving the use profile of a herbicide can be the combination of the active ingredient with one or more other active ingredients, which contribute the desired additional properties. However, phenomena of physical and biological incompatibility, for example lacking stability of a coformulation, decomposition of an active ingredient or antagonism of the active ingredients, occur not infrequently when using several active ingredients in combination. In contrast, what is desired is combinations of active ingredients with a favorable activity profile, high stability and the greatest degree of synergistically increased action, which allows reduction of the application rate compared with the individual application of the active ingredients to be combined.
Surprisingly, it has now been found that active ingredients from the group of the abovementioned broad-spectrum herbicide (A) in combination with other herbicides from group (A) and, if appropriate, certain herbicides (B) act synergistically in an especially advantageous manner when they are employed in the oil-seed rape crops which are suitable for the selective use of the first-mentioned herbicides.
Subject matter of the invention is thus the use of herbicide combinations for controlling harmful plants in oil-seed rape crops, wherein the herbicide combination in question comprises a synergistically effective content of
(A) a broad-spectrum herbicide from the group of the compounds consisting of
(A1) compounds of the formula (A1)
in which Z is a radical of the formula —OH or a peptide residue of the formula —NHCH(CH
3
)CONHCH(CH
3
)COOH or —NHCH(CH
3
)CONHCH[CH
2
CH(CH
3
)
2
]COOH, and its esters and salts, preferably glufosinate and its salts with acids and bases, in particular glufosinate-ammonium, L-glufosinate or its salts, bialaphos and its salts with acids and bases and other phosphinothricin derivatives,
(A2) compounds of the formula (A2) and their esters and salts,
preferably glyphosate and its alkali metal salts or salts with amines, in particular glyphosate-isopropylammonium, and sulfosate,
(A3) imidazolinones, preferably imazethapyr, imazapyr, imazamethabenz, imazamethabenzmethyl, imazaquin, imazamox, imazapic (AC 263,222) and their salts and
(A4) herbicidal azoles from the group of the inhibitors of protoporphyrinogen oxidase (PPO inhibitors) such as WC9717 (=CGA276854), and
(B) one or more herbicides from the group of the compounds consisting of
(B0) one or more structurally different herbicides from the abovementioned group (A) and/or
(B1) foliar- and soil-acting herbicides which are active against monocotyledonous and dicotyledonous harmful plants and/or
(B2) predominantly foliar-acting herbicides which are active against dicotyledonous harmful plants and/or
(B3) predominantly foliar-acting herbicides which are active in particular against monocotyledonous harmful plants and/or
(B4) foliar- and soil-acting herbicides which are active predominantly against monocotyledonous harmful plants,
and the oil-seed rape crops tolerate the herbicides (A) and (B) present in the combination, if appropriate in the presence of safeners.
“Structurally different herbicides from the abovementioned group (A)” in group (B0) applies only to herbicides which are embraced by the definition of group (A) but which are not present as component (A) in the herbicide combination in question.
In addition to the herbicide combinations according to the invention, it is possible to use further crop protection agents and auxiliaries and formulation aids which are customary in crop protection.
The compounds are referred to by their common names and they are known from the “Pesticide Manual” 11
th
Ed., British Crop Protection Council 1997 (hereinbelow also abbreviated to “PM”). In addition to the herbicide combinations according to the invention, further crop protection active ingredients and formulation aids and auxiliaries conventionally used in crop protection may be used.
The synergistic effects are observed when the active ingredients (A) and (B) are applied jointly, but can also be observed upon split application (splitting). It is also possible to apply the herbicides or the herbicide combinations in several portions (sequential application), for example after pre-emergence uses, followed by post-emergence applications or after early post-emergence applications, followed by applications at the medium to late post-emergence stage. The simultaneous use of the active ingredients of the combination in question, if appropriate in several portions, is preferred. However, the split application of the individual active ingredients of a combination is also possible and may be advantageous in individual cases. Other crop protection agents such as fungicides, insecticides, acaricides and the like, and/or various auxiliaries, adjuvants and/or fertilizer applications can also be integrated into the use of this system.
The synergistic effects permit reduction of the application rates of the individual active ingredients, a more potent action against the same harmful plant species with the same application rate, the control of species to which the action has previously not extended (gaps), a widened application period and/or a reduced number of the individual applications required, and, as a result for the user, economically and ecologically more advantageous weed control systems.
For example, the combinations of (A)+(B) according to the invention make possible synergistically increased effects which far and unexpectedly exceed the effects which are achieved with the individual active ingredients (A) and (B).
WO-A-98/09525 has already been described a method of controlling weeds in transgenic crops which are resistant to phosphorus-containing herbicides such as glufosinate or glyphosate, where herbicide combinations are employed which comprise glufosinate or glyphosate and a
Bieringer Hermann
Hacker Erwin
Willms Lothar
Aventis CropScience GmbH
Clardy S. Mark
Frommer & Lawrence & Haug LLP
LandOfFree
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