Plant protecting and regulating compositions – Plant growth regulating compositions – Plural active ingredients
Reexamination Certificate
1999-08-10
2004-04-20
Clardy, S. Mark (Department: 1616)
Plant protecting and regulating compositions
Plant growth regulating compositions
Plural active ingredients
C504S103000, C504S128000
Reexamination Certificate
active
06723681
ABSTRACT:
DESCRIPTION
The invention is in the field of the crop protection products which can be employed against harmful plants in tolerant or resistant crops of cereal and which comprise, as herbicidally active substances, a combination of two or more herbicides. In the following, the term cereal is used in a narrow sense and relates only to the cereal crops of wheat, barley, rye, oats and corresponding specific variants such as triticale. The term here is not intended to include rice or corn.
The introduction of tolerant or resistant cereal varieties and cereal lines, in particular transgenic cereal varieties and cereal lines, adds novel active substances which per se are not selective in conventional cereal varieties, to the conventional weed control system. The active substances are, for example, the known broad-spectrum herbicides such as glyphosate, sulfosate, glufosinate, bialaphos and imidazolinone herbicides [herbicides (A)], which can now be employed in the tolerant crops developed specifically for them. The efficacy of these herbicides against harmful plants in the tolerant crops is high, but depends—similarly to other herbicide treatments—on the nature of the herbicide employed, its application rate, the preparation in question, the harmful plants to be controlled, the climatic conditions, the soil conditions etc. Furthermore, the herbicides exhibit weak points (zero effect) against specific species of harmful plants. Another criterion is the duration of action, or the degradation rate of the herbicide. If appropriate, changes in the sensitivity of harmful plants, which may occur upon prolonged use of the herbicides or within a geographical limited area, must also be taken into consideration.
The loss of action against individual plants can only be compensated for to some extent by higher application rates of the herbicides, if at all. Moreover, there is always a demand for methods to achieve the herbicidal effect with lower application rates of active substances. A lower application rate not only reduces the amount of an active substance required for application, but as a rule, also reduces the amount of formulation auxiliaries required. Both reduce the economic outlay and improve the eco-friendliness of the herbicide treatment.
One possibility for improving the use profile of a herbicide may consist in combining the active substance with one or more other active substances which contribute the desired additional properties. However, the combined use of a plurality of active substances does not infrequently lead to phenomena of a physical and biological incompatibility, for example lacking stability of a coformulation, decomposition of an active substance or antagonism of the active substances. In contrast, what is desired are combinations of active substances with a favorable profile of action, high stability and as synergistic an increased action as possible, which allows the application rate to be reduced in comparison with the individual application of the active substances to be combined.
Surprisingly, it has now been found that active substances from the group of the abovementioned broad-spectrum herbicides (A) in combination with other herbicides from group (A) and, if appropriate, specific herbicides (B) interact especially favorably when they are employed in the cereal crops which are suitable for the selective use of the first-mentioned herbicides.
The invention therefore relates to the use of herbicide combinations for controlling harmful plants in cereal crops, wherein the herbicide combination in question has a synergistically active 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 radical of the formula —NHCH(CH
3
)CONHCH(CH
3
)COOH or —NHCH(CH
3
)CONHCH[CH
2
CH(CH
3
)
2
]COOH, and their 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 sulfosates,
(A3) imidazolinones, preferably imazethapyr, imazapyr, imazamethabenz, imazamethabenz-methyl, imazaquin, imazamox, imazapic (AC 263,222) and their salts and
(A4) herbicidal azoles from the protoporphyrinogen-oxidase inhibitors (PPO inhibitors), such as WC9717 (=CGA276854), and
(B) one or more herbicides from the group of the compounds which consists of
(B0) one or more structurally different herbicides from the abovementioned group (A) and/or
(B1) foliar- and/or soil-acting (residual action) herbicides which are effective selectively in cereals particularly against monocotyledonous harmful plants, and/or
(B2) predominantly foliar-acting herbicides which are effective selectively in cereals against monocotyledonous and dicotyledonous harmful plants and/or
(B3) foliar- and soil-acting herbicides which are effective selectively in cereals against dicots and monocots and/or
(B4) foliar-acting herbicides which are effective selectively in cereals against monocotyledonous and dicotyledonous harmful plants,
and the cereal crops are tolerant to the herbicides (A) and (B) which form a constituent of the combination, if appropriate in the presence of safeners.
“Structurally different herbicides from the abovementioned group (A)” in group (B0) only include herbicides which are covered by the definition of group (A), but which are not component (A) in the combination in question.
In addition to the herbicide combinations according to the invention, other crop protection active substances and adjuvants and formulation auxiliaries conventionally used in crop protection may be used.
The synergistic effects are observed when the active substances (A) and (B) are applied together, but can also be observed upon split application (splitting). Another possibility is to apply the herbicides or herbicide combinations in several portions (sequential application), for example after pre-emergence applications, followed by post-emergence applications or after early post-emergence applications, followed by applications at medium or late post-emergence. Preferred is the simultaneous application of the active substances of the combination in question, if appropriate in several portions. However, a staggered application of the individual active substances 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 different auxiliaries, adjuvants and/or fertilizer applications may also be integrated into this system application.
The synergistic effects allow the application rates of the individual active substances to be reduced, a more potent action against the same species of harmful plant combined with the same application rate, the control of species to which the action has hitherto not extended (zero effect), an extended application period and/or a reduced number of required individual applications and—as a result for the user—economical and ecologically more advantageous weed control systems.
For example, the combinations of (A)+(B) according to the invention allow synergistically increased effects which far and unexpectedly exceed the effects which can be achieved with the individual active substances (A) and (B).
WO-A-98/09525 has already described a method of controlling weeds in transgenic crops which are resistant to phosphorus-containing herbicides such as glufosinate or glyphosate, herbicide combinations being employed which comprise glufosinate or glyphosate and at least one herbicide from the group consisting of prosulfuron, primisulfuron, dicamba, pyridate, dimethenamid, metolachlor, flumeturon, propaquizafop, atrazine, clodinafop, norflurazone, ametryn, terbuthylazine, simazine, prometryn, NOA402989 (
Bieringer Hermann
Hacker Erwin
Willms Lothar
Clardy S. Mark
Frommer & Lawrence & Haug LLP
Hoechst Schering AgrEvo GmbH
LandOfFree
Herbicidal compositions for tolerant or resistant cereal crops does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Herbicidal compositions for tolerant or resistant cereal crops, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Herbicidal compositions for tolerant or resistant cereal crops will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3226315