DD211274A1 - HERBICIDE MEDIUM - Google Patents

Abstract

The invention relates to herbicidal agents for combatting monocotyledonous and dicotyledonous weeds in crop plants. As active ingredient they contain a combination of substituted Thiocarbamaten of the general formula I, in which R deep 1 = hydrogen, ethyl or n-propyl and, R deep 2 = cyclohexyl or N-propyl and substituted thioureas of the general formula II, in the R 1 = H or methyl and R deep 2, R deep 3, which may be the same or different, = H or halogen.

Description

VEB CHEMICAL COMPANY. BITTER PSLD. Bitterfeld, 3rd November 1982

Herbicidal agents

Field of application of the invention:

The compositions according to the invention can be used for combating monocotyledonous and dicotyledonous weeds in cultivated plant stands,

Characteristic of the known technical solutions ;

It is known that the long-term use of weed control agents acting predominantly against dicotyledonous weeds to shift the weed flora in favor of grass weeds and hard-to-control dicotyledonous species such as Klettenlabkraut u. a. has led ·. ':

It is also known that substituted thiocarbamates readily control grass weeds in beet stocks (US Pat. No. 3,175,897, DE-OS 2,738,628, CH-PS 357238). There is a certain effect with doses of dicotyledonous weed at twice the dose; But the beet compatibility is negatively affected.

The use of phenylthiourea derivatives is also known. On the one hand unsubstituted phenylthioureas, such as 1,1-dimethyl-3-phenylthiourea (DD-PS 110115; BE-PS-839797; US-PS 2655447) are described which are used selectively

- 2 - 2360

but not enough against monocots; Weeds work; On the other hand, phenyl-substituted thiourea derivatives are also known as herbicidally active compounds.

Examples of these are N-CS 1 -dichlorophenyl-N ¹ , N ¹ -dimethylthiourea) against dicotyledonous and monocotyledonous weeds with use in many cultures (DE-PS 2542468) or N »(4-bromophenyl-N, N'-dimethylthiourea ), which has a certain effect in the wake-up procedure against couch grass and Johnsongras (Sorghum halepense) (US-PS 2655447). In combination with N-isopropyl-2-chloroacetanilide, a wider range of monocotyledonous and dicotyledonous weeds can be detected in important agricultural crops. However, the simultaneous fight against mono- and dicotyledonous weeds always brings certain problems.

The aim of the invention is to develop new herbicidal compositions which simultaneously destroy atopic monocotyledonous and dicotyledonous weeds. "

This object is achieved in that the herbicidal agent in addition to conventional excipients and carriers as the active ingredient is a combination of substituted thiocarbamates of the general formula I '

J ^ N. -CO-S-G _? HI),. in the

^R 1

R - is hydrogen, is ethyl or n-propyl and R is cyclohexyl or n-propyl,

  '. "- 3» ·.. " , · '.; V; , : ϊ 2360

and substituted aryl thioureas of the general ^; , , Formula II.

(II)

in the ^'7; Λ. _: '. , '. \ '. , R. = H or methyl,. , ,. .;. '. ,; \

R ₉ R, which may be the same or different, .. ·. ,

= H or halogen.

The active compound combinations according to the invention surprisingly show a synergistic effect, both against monocotyledonous and against dicotyledonous harmful plants. '. '

In addition, a significant reduction in the amount of effort per hectare with simultaneous improvement in activity against monocotyledonous and dicotyledonous weeds is achieved in the spectrum of action of herbicide combination according to the invention are all ^; Containing weed species in Rübenanbäu included. ',. , \. '. , ^:

The application of the herbicidal agent is conveniently carried out in the customary for Unl herb control formulation or application forms, such as. As solutions, emulsions, suspensions or spray concentrates, which prepares with the addition of liquid and / or solid carriers or diluents mostly with the addition.oberflächenaktiv substances or other ITormulierungshilfsmittel and diluted for use with water.

The application forms vary with the intended use. It is essential to ensure a fine distribution of the active substances in each case. The preparation of the various preparations is carried out in a conventional manner by Hisch- ^ and grinding or by dissolution.

Ausführunssbeispiel

The following examples are intended to demonstrate the synergistic action of the agents according to the invention, the active ingredient sparing which can be achieved with them, and the crop plant compatibility.

This was' thiocarbamate as

N-cyclohexyl-II-ethyl-S-ethyl-thiocarbamate (A)

and as a thiourea

li- (4-Broraphenyl-N '.', ϊ ^; ί'-dimethylthiourea (B)

used "

In greenhouse experiments the herbicidal activity of mixtures compared to the individual components was tested using a Boder.s medium sorption capacity (sandy loam) with a water capacity of 60 'ο.

The application of the active ingredients or mixtures of active ingredients was carried out in the form of a 72 / ffl.gen emulsion concentrate and a wettable spray powder in 1000 liters of water. per hectare in the spray booth after sowing the test plants.

The following key was used to assess the herbicidal activity:

Table I; üloni ^ urgchlüssel

Boniturnote _ι _ _ί .. _{x mf ι ι} SchadstärJ-c _< e _iiiiiii ; _iii) _ _u _ _Li _ ^ _ji _ ^ _ U

1 annihilates 0

2 5

3 15 .4 30

5 50

6 70

7 85 S 95 S undamaged 100

The testing took place on the weed species:

Stellaria media (L.)

Seriecio vulgaris L.

Anthenis arvensis L.

Thlaspi arvense L.

Agrostemma githago L.

Lamium purpureum L.

Ghenopodium album L.

Polygonum lapathifolium L.

Spergula arvensis L.

Galium. .aparine L.

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

Poa annua L.

Setaria glauca (L.) P.B.

Bromus secalinus L.

Echinochloa crus-galli (L.) P.B.

i.It with the agents according to the invention occurred in comparison to the Einzelwixkstoffen an effect improvement, which is based on synergistic effects. The combination effect is known to be described as synergistic if it is better than the independent relative effect calculated from the two individual effects of the mixing partners / GOLBY, eeds J ^ (1967) 1, 20 - 22].

The calculation was carried out according to LAIiG et.al. ITagungsbericht "Weed Control in Industrial Plant Production", Halle (1979) 1.

The comparison between the expected and the actual amount of effort required by the combination refers to a residual weed loss of 10 % (ED _{0 (} - value).) Thus, this comparison is not the strongest synergism, but a practice-relevant effect of 90. .. 100 '/ o control measures significantly, the respective averages of .'Testpflanzen be specified. For · the calculation were the Boniturvv he used te of 30 days after application.

Table II ': Active toff one parunp ;. ia range of action ED ₀ by the invention I ₁ -UtG ₁ I

Mixture! Planting ratio Λ. p «rl · -I-J

dose determined in the experiment

A B. A + B

  kg AS / ha '

according to models calculated dose independently equivalent -: "kg AS / ha j '

saved

dose

independently equivalent

74; 26 monocot dikotyle total 0.53. 2.78 1.55. 0.18 0 _s 98 0.55 0.71 3.76 2.10 56 s 44 monocot dikotyle total 0.63 2.0.2 1.27 0,50 1,58 1,00 1.13 3.60 2.27 35: 65 monoko-ty'le dicotyle total 0.38 1.20 0.69 0.70 2.24 1.29 1.08 3.44 1.98 12 s 88 monocot dikotyle total 0.12 0.39 0.24 0.91 2.89 1.78 1.03 3.28 2.02

1.07 7.90 2.90 0.98 7.75 2.80 34 52 28 28 51 25 1.17 4.01 2.75 0.99 4.67 2.79 3 10 17 -14 23 19 1.81 5.92 2.67 1.63 6.03 2.74 40 42 26 34 43 28 2.80 5.86 2.75 2.43 5.64. 2.69 63 44 27 58 42 25

Table III: Improvement of Herbicides by the Inventive Agents

Ki s clrung ratio A: B : 26 test plants Expenditure [.kg AS / ha] A 3 0.18 0.98 0.98 A + B Weed trimming in the experiment calculate independently. t equiv. Improved circulation independently. equiv. 11 8 1 74 : 44 monocot dikotyle total 0.53 2.78 2.78 0.30 1.58 1.58 0.71 3.76 3.76 8 1 2 24 8 1 19 9 1 16 · 7 1 28 2 56 : 65 monocot dikotyle total 0.38 2.02 2.02 0.70 2.24 2.24 0.68 3.60 3.60 2 5 4 46 7 5 30 8 6 44 2 1 11 6. 4 35 : 68 monocot dikotyle total 0.38 1.20 1.20 0.91 2.89 2.89 1.08 3.44 3.44 6 2 3 33 8 5 17 8 7 27 6 2 29 6 4 12 monocot dikotyle total 0.12 0.39 0.39 1.03 3.28 3.28 5 2 3 53 8 7 34 8 7 48 6 4

- 8 -, 2360

Example 2

In field trials, the active ingredient combination A + B (mixing ratio '2: 1) was tested on a range of agricultural and horticultural crops to characterize their pre-emergence selectivity at 3.0, 4.0 and 5.0-kg AS / ha. The visual assessment of crop tolerance was carried out for 20 days (date I) and 40 days (date II) after administration according to the 3onitürkey shown in Table I. The results are included in Table IV.

Table IV crop compatibility of the inventive compositions at different levels of expenditure

KuItürρflanse , 3 kg AS / ha II 4 kg AS / ha II 5 kg AS / ha II Meeting . 9 meeting 8th meeting 8th I ' ⁹ ' I 8th . ' I 7th mangel 9 .9 8th . 8th 7 7 sugar beet   9 9 - 9 8th 8th 9 spinach : · 9 9 8th 9 8th 9 Mark's cabbage , 9 9 9 9 8th 9 sunflower , 9 .9 · - 9 , 9 9 9 lupine , 9th 9 9 9 9 8th potato 9 9 9 Red clover 9 8th 8th

Claims (1)

  - 9 - 2360 Erfindimffsanspruch Herbicidal agents for combatting monocotyledonous and dicotyledonous weeds in long-lasting foliage plants, characterized in that they contain, in addition to the usual excipients and carriers, as active ingredient a combination of substituted thiocarbamates !! der'general formula I. N - CO - S - C ₂ H ₅ (I), ^R i in eggs. R ₁ = hydrogen, ethyl or n-propyl and R = cyclohexyl or n-propyl, imd substituted thioureas of the general formula II R ₀ SR · - '"X I X '' \ 0 V-IiH-CW ^ (II), in the R ₁ = H or methyl and ι .. R, R_, which may be the same or different, = H or halogen,
contain. ,