Synergistic herbicidal mixtures

Details Synergistic herbicidal mixtures Synergistic herbicidal mixtures

1998-05-01

2000-01-11

Davis, Zinna Northington

Plant protecting and regulating compositions

Plant growth regulating compositions

Organic active compound containing

546112, A01N 4390

Patent

active

060136057

DESCRIPTION:

BRIEF SUMMARY
The invention relates to novel mixtures of 1-(3-chloro-4,5,6,7-tetrahydropyrazolo-[1,5-a]-pyridin-2-yl)-5-(methylprop argylamino)-4-pyrazolylcarbonitrile and other herbicides, and to their use for controlling weeds in agricultural crops.
The herbicidal action of 1-(3-chloro-4,5,6,7-tetrahydropyrazolo-[1,5-a]-pyridin-2-yl)-5-(methylprop argylamino)-4-pyrazolylcarbonitrile has already been disclosed (DE OS 43 15 330). Furthermore, it is known that the use of mixtures of active substances can result in specific advantages, especially since the use of the individual active substances is unsatisfactory in most cases.
It has now been found that herbicidal compositions which comprise, as active components, a mixture of 1-(3-chloro-4,5,6,7-tetrahydropyrazolo-[1,5-a]-pyridin-2-yl)-5-(methylprop argylamino)-4-pyrazolylcarbonitrile [Component (A)] and another herbicide selected from the group consisting of bentazone, molinate, daimuron, thiobencarb, butachlor, pretilachlor, dimepiperate, fenoxaprop-ethyl, clomeprop, cinmethylin, bromobutide, quinclorac, mefenacet, pyrazosulfuron-ethyl, esprocarb, cinosulfuron, thenylchlor, cumyluron, MK 243, naproanilide, anilofos, benfuresate, bifenox, CH-900, MCPA, nitrofen, oxadiazon, pendimethalin, simetryn, sulcotrione (ICIA0051), trifluralin, piperophos, pyributicarb, ethoxysulfuron, bensulfuronmethyl, pyrazolate, pyrazoxyfen, benzofenap, cyclosulfamuron, cyhalofop-butyl, NBA-061, azimsulfuron, propanil or imazosulfuron [Component (B)] exhibit an especially high herbicidal activity without losing the selective properties relative to agricultural crops such as rice and which in some cases even decidedly improve crop compatibility.
With the exception of cumyluron and NBA-061, the active substances of Component (B) are known, for example, from The Pesticidal Manual, 10th Edition (1994), Brit. Crop Prot. Council, London, and The Royal Soc. of Chem., Cambridge. Cumyluron itself has been described, inter alia, in Agrochem. Jpn., 63, 18-19, 1993 (Konnai et al.) and NBA-061 in DE 504059, EP 612735 and EP 726259.
Surprisingly, the herbicidal activity of the active substance combinations according to the invention by far exceeds the activity of the individual components and also the total of the individual components. Thus, a synergistic effect is present.
For example, the active substance combinations according to the invention can be used for controlling the following plants: Sinapis, Galium, Stellaria, Matricaria, Galinsoga, Chenopodium, Brassica, Urtica, Senecio, Amaranthus, Portulaca, Xanthium, Convolvulus, Ipomea, Polygonum, Sesbania, Cirsium, Carduus, Sonchus, Solanum, Lamium, Veronica, Abutilon, Datura and Viola, and Setaria, Scirpus, Panicum, Digitaria, Poa, Eleusine, Brachiaria, Lolium, Bromus, Cyperus, Agropyron, Sagittaria, Monochoria, Fimbristylis, Eleocharis, Ischaemum, Potamogeton, Eichhornia and Apera.
The mixtures according to the invention are employed post-emergence by direct application, for example by spraying them onto the plants, or else pre-emergence by direct application into the paddy water, or by spraying. Selective application is possible in a series of crop plantings, of which rice is preferred. The rate of application is between 0.001 and 5 kg/ha for the total of the components in the mixture, depending on the intended purpose.
The weight ratio of Component (A) to Component (B) in the mixture is between 1:0.1 and 1:100, preferably 1:0.5 and 1:50.
If desired, the compositions according to the invention can also be used in the form of a mixture with other active substances, for example other crop protection chemicals or pesticides, depending on the intended purpose.
Moreover, the intensity and speed of action can be enhanced for example by activity-promoting additives such as organic solvents, wetting agents and oils. Such additives may therefore allow the dosage rate of active substance to be reduced even further.
It is expedient to employ the compositions characterized in the form of preparations such as powders, materials for spreading, granules, solutions,

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