DD276619A1 - SELECTIVE HERBICIDE COMBINATIONS - Google Patents

Abstract

The invention relates to selective herbicide combinations for the control of monocotyledonous and dicotyledonous weeds in crop plants, in particular in cereal crops and on greenland. The novel combinations contain, in addition to the usual auxiliary and carrier substances as active ingredients substituted phenoxy-carboxylic acids of the general formula I or II and an alkali metal cyanate. Not only do they cause an extension of the spectrum of action, but, surprisingly, real synergistic effects occur, in particular with regard to the action against dicotyledonous harmful plants.

Description

or by the general formula II

EY ^ OVO-CH-CCOR

in which R ₁ and R _{2 may be} identical or different and are H, halogen or lower alkyl,

η - may be 1 and 3 and R _{3 is} Na, K, H or alkyl, and an alkali cyanate of the general formula III

in which M stands for Na or K.

2. Selective herbicide combinations according to claim 1, dadu'.ch characterized in that they contain preferably 7O ... 95Teiie a Na'riLimcyanats and 5 ... 30 parts of at least one substituted phenoxycarboxylic acid.

Anwendungsgabiet the invention

The invention relates to novel herbicidal compositions for the selective weed control of annuollon monocotyledonous and dicotyledonous weeds in arable crops, preferably for use in crop rotation in cereal crops.

Characteristic of the known technical solutions

The use of phenoxycarboxylic acid herbicides for weed control in cereal and grassland crops is known and practiced worldwide (WEGLER, R .: Chemie pesticides, vol. 2 1970, 274-28O _1, as a result of the different sensitivity of broadleaf weed species more resistant species such as Matricaria ssp., Galium aparine, Galeopsis srp., Veronica csp., and Stellaria media in the course of the multi-annual application and place higher demands on effective weed control.

Potassium cyanate is one of the successive inorganic horbicides with selective properties. The effect of the alkaline earth metal compounds is directed against dicotyledonous weed species with non-waxy leaves (BETTY, R.H., and B.H.DAVIS: Proc. Northeast, Statos Wood Control, 19b1, p.161). Sodium cyanate causes similar effects, but no practical use is confessed.

Suggested were dos woitoror. Gomischa from oinom cyanate and amino- or chloro substituted or picolinic acid and trichlorophenoxyssacetic acid and / or trichlorophenoxypropionic acid (JA 14310/68) or mixtures of a cyanate and / or sulfamate and salts, esters or amides of trichlorophenoxy-oxyacetic acid and / or trichlorophenoxypropionic acid and 2,3, 5-trichloro-4-pyridinol (JA 23027/68).

Diosc Horbizidkcmbinationon, however, are not suitable for selective weed control in mangol crop tolerance. One effective combat typical of the Uncreutor in Gotroido requires oino constanto adaptation of the habitual word obeying agent to the Beinngo dor practice.

Ziol of the invention

The aim of the invention is to develop new selective agents by suitable combinations of known active substances which are well-suited for weed control, in particular in cereal crops and on grassland.

Explanation of the essence of the invention

This object is achieved in that the selective herbicide combinations in addition to conventional excipients and carriers as active ingredients at least one substituted Phonoxycarbonsäure the general formula I.

or the allturn formula II

 O-C.'l-COOR.

-CiI-COOR ₃

ir. (Jonen M, and R _{2 may be} identical or different and are H, halogen or lower alkyl, η = 1 or 3 and R _{3 is} Na, K, H or Alky !, and an alkaiicyanate of the general formula III

I III

where M stands for Na or K.

contain.

These combinations not only cause an extension of the Wii kungspektrums and a simple addition of the different effects, but there are surprisingly real synergistic effects, especially with regard to the action against dicotyledonous harmful plants.

With the active compound combinations according to the invention, a significant increase of the Biikämpfungserfolyes against typical cereal weeds v \, o Stellario media, Lamium spp., Guleopsis by the interaction of two acting predominantly against dicotyledonous weed components. spp., Matricaria spp. and Galiu.n aparino while reducing the application rate per unit area oranges

For diogenic agents, 70 to 95 parts of emergency cyanoate and 5 to 30 parts of substituted phenoxycarboxylic acids are recommended.

The application of the herbicide combinations is zwockmäßigerweise in the customary for herbicides Präparunys- or application forms, such as solutions, emulsions, suspensions or spray concentrates, which prepares with the addition of liquid and / or solid carriers or diluents usually with the addition of surface-active substances and other Formuüerungshilfsmittol and diluted with water for use. It is essential, in any case, to ensure a fine distribution of the effective substances. The preparation of the various preparations is carried out in the known manner by mixing and milling or by dissolution. Apart from a common application of erfinduigsgomäßen combinations with other agrochemicals is possible.

Dio below. Examples are intended to explain the invention in more detail without restricting it.

Ausführungsbeispieie

In Gowächshausvorsuchon, under a single soil of average sorption capacity (sandy lohm) was tested at ooror Wassofkapp; itität of 60% dio h <\ bizido effect of mixtures of active ingredients compared to the Cinzolkomponanton. Daboi have been followed by active ingredients

(A) Sodium salt of 2-methyl-4-chloro-oxycactic acid

(B) Sodium salt of 2,4-dichlorophoroxyoxygenase

(C) Potassium salt dor 2 (2,4-DiChIOrPhOnOXy) -PrOPiUiISaUrO (DiNntriumcyonat

Dio application took place in 10001 water jo Hoktar in the spray booth after dom Auflaufon dor Tostpflanzon. To confirm the effect of horbicidone and the presence of cultured plant precursors, the following was found:

Table 1: Bonrturkey Schad strength weed growth Boniturnote destroyed 0 1 5 2 15 3 30 4 50 5 70 6 85 7 95 8th unharmed 100 9

The test was carried out on the weed species Stellaria madia (L.) Senecia vulgaris L.

Anthemis arvensis L.

ThlasDi arvense L.

Agrosteinma githago L.

Lamium pupureum L.

Chenopodium album L Polygonum lapathifolium L.

Spergula orvensis L.

Galium aparine L.

Apara spica-venti (L.) P.B.

Pea annua L.

Setaria glauca (L.) P. B.

BromussecalinusL.

F.chinochloa crus-galli (L.) P. B. as well as winter barley and winter wheat.

In contrast to the single active substances, the active substance combinations produced a change in activity, which is based on synetgistic effects. The Kombinationswirkur.g is then referred to as synurgistic, if it is better than calculated from the two individual effects of the mixing partners independent relative effect (COLBY Weeds 15 (1967) 1, 28-22).

The calculation was carried out according to IANG et. al. (Conference report "Weed Control in Industrial Plant Production", Hall 11979)).

The comparison of the expected and the actual effort required by the combination refers to a residual occlusion rate of 5% (ED _K value). In this comparison, therefore, not the strongest synergism, but a practice-relevant effect of 95 ... 100% control success prevail, whereby the respective average values of the test plants are given.

For the calculation, the rating values from the 30th day after the application were used. Table 2 shows the substance incorporation achieved with the herbicide mixtures. Table 3 shows the effect improvement achieved with the combinations. The culture compatibility of the combinations is included in Tabello 4.

Table ?. Subitonselntparung In the impact area ED ₉₆ by the Kombinattonen

mixing ratio Testpflnnzon dose determined in the experiment A D KGAs / ha after Modnil saved 0.653 1,522 A + D calculated dose 0.335 3,015 2,175 dose Single drug combinations 0.263 4,987 3,350 KGAs / ha % I.KoinbinationA + D B D 5,250 30:70 dikotylo 0.653 1,522 B f D 2.B16 23 10:90 dikotyk- 0.335 3,015 2,175 6,078 45 5:95 dicotyle 0.263 4, aa / 3,350 8.795 4C 2Komblr, ationB + D C D b li> i) 30:70 dikotylo 0.653 1,522 C (D. 2,772 22 10:90 dikotylo 0.335 3,015 2,17b 5,470 39 5:95 nikotylo 0.263 4,987 3,350 7,244 28 j. *? mblr, ationC + D t., 250 30:70 dikotylo 2,410 10 10:90 dikotylo 4056 17 5:95 dikotylo 6,438 18

test plants application rates A combinations D A + D -4- in ex loading 276 619 individual active 0.653 KGAs / ha 1522 2,175 periment rochnet 0.335 3,015 3350 Unkrautbesa'- Wirkungs- dicotyle 0.263 4,987 5,250 2 5 verbes dicotyle B 0 B + D 2 8th provement Table 3 Improvement of herbicidal activity by the combinations dicotyle 0.653 1,522 2,175 2 7 mixing ratio 0.335 3,015 3350 3 dicotyle 0.263 4,987 5,250 4 7 6 dicotyle C D C + D 4 8th 5 1st combination A + D dicotyle 0.653 1,522 2,175 4 6 30:70 0.335 3,015 3,350 3 10:90 dicotyle 0.263 4,987 5,250 9 13 4 5:95 dicotyle 7 12 2 2.CombinationB + D dicotyle y 5 30:70 3 10:90 5 5:95 3 3. Combination CfO 30:70 10:90 G: 95

Table 4 Selectivities of the drug combinations

mixing ratio

KGAs / ho

Bigg

Winter wheat (Boniturnoten)

1st combination A + D 2,174 9 30:70 3350 9 10:90 5,250 9 5:95 2. Combination B + D 2,175 9 30:70 3350 9 10:90 5,2b0 9 5:95 3. Combination C + D 2,175 9 30:70 3,350 9 10:90 5,250 9 5:95

Claims (1)

-ί- £ 276 claim: 1. Selective merbicide combinations for combating monocotyledonous and dicotyledonous weeds in cultivated plant stands, in particular in cereal crops and on grassland, characterized 'characterized in that in addition to conventional excipients and Tcägerstoffen as active ingredients at least one substituted phenoxycarboxylic acid of the general formula I. 0- (CH₁) - (JOOR ..
2 Xi J