DD242163A1 - SELECTIVE HERBICIDE COMBINATIONS - Google Patents

Abstract

The invention relates to selective herbicide combinations for the control of monocotyledonous and dicotyledonous weeds in cultivated plant stocks which contain as active ingredients 3-chloropyridazinyl-6-phenyl ether, N- (4-bromophenyl) -N, N-dimethylurea and / or protometry. In these combinations, which can be applied in different mixing ratios, real synergistic effects occur, in particular with regard to the action against monocotyledonous harmful plants. Their application takes place in the customary for weedkämpfungsmittel preparation or application forms.

Description

Ill

I \\

(CHO ₀ CH-HH * "^ / ³²

j <-

contain.

2. Selective herbicidal compositions according to claim 1, characterized in that they come in combination with other pesticides and / or agrochemicals used.

Field of application of the invention

The invention relates to novel herbicide combinations for the selective weed control of annual mono- and dicotyledonous weeds in arable crops, preferably in potatoes.

Characteristic of the known technical solutions

The herbicidal action of phenylpyridazin-3-yl ethers against predominantly monocotyledonous weed species is described by a number of patents (JA 6358/66, JA 703920, JA 7113753, JA 7113758, JA 56005428, JA 71214751, SU 262029, JA 7113754) ).

It has been shown that the application is so far relatively limited due to lack of selectivity (plant protection and pest control, ed. K. H. Büchel, Georg Thieme Verlag Stuttgart 1977, p. 182) and limited to use in tomatoes, strawberries and rice.

It is also known that substituted aryl ureas have a good action against dicotyledonous weeds (DD-PS 111542, DD-PS 102275 et al.). To expand their spectrum of activity, mixtures have been developed with triazines which have a very good activity against anniculate dicotyledonous weed species and are well suited for selective weed control (FR 2187226, GB 1366887). Furthermore, it is known that mixtures of acetanilides are suitable for closing their gaps in our Ungräsern (DD-PS 13438), which have not yet been used.

Object of the invention

The aim of the invention is to develop new selective herbicide combinations, which simultaneously capture annuelle mono- and dicotyledonous weeds with improved crop plant compatibility.

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 3-chloro-pyridazinyl-6-phenyl ether of the formula I.

and N- (4-bromophenyl) -N ', N'-dimethylurea of the formula II

TiH-CO-N

/ ^CE 3

CH.

and optionally 2-methylthio-4,6-bis (isopropylamino) -1,3,5-triazine (Prometryn) of the formula I.

kX

NE-CH (CH,) - "

J c $ d.

contain.

These combinations cause not only an extension of the spectrum of action as well as a simple addition of the different effects, but there are real synergistic effects, especially with regard to the effect against monocotyledonous weeds.

In the drug combinations according to the invention, the well-known good effect of 3-chloro-pyridazinyl-6-phenyl ether against grass weeds by the interaction with acting against dicot species N- (4-bromophenyl) -N ', N'-dimethylurea was added and thus a significant reduction the application rate per unit area while improving the herbicidal activity and crop plant compatibility achieved. In addition, the inclusion of prometryn proves effective under certain conditions. The application of the herbicide combinations is expediently carried out in the preparation or application forms customary for herbicides, such as, for example, solutions, emulsions, suspensions or spray concentrates which, with the addition of liquid and / or solid carriers or diluents, usually prepare surface-active substances and other formulation auxiliaries and can be diluted with water for use. The application forms vary with the intended use. It is essential in any case to ensure a fine distribution of the active substances.

The preparation of the various preparations is carried out in the known manner by mixing and milling or by dissolution. In addition, a common application of the combinations according to the invention with other agrochemicals is possible

 The following examples are intended to illustrate the invention without limiting it.

example 1

In greenhouse experiments, using a soil of medium sorption capacity (sandy loam) with a water capacity of 60%, the herbicidal activity of mixtures of active substances was tested in comparison to the individual components. The following active ingredients were considered:

3-Chloro-pyridazinyl-6-phenyl ether (A)

N- (4-bromophenyl) -N ', N'-dimethylurea (B)

2-methylthio-4,6-bis (isopropylamino) -1,3,5-triazine (C)

To assess the herbicidal activity, the key given in Table 1 was used.

The test was carried out on the weed species Stellaria media (L.) Senecio vulgaris L.

Anthemis arvensis L. Thlaspi arvense L.

Agrostemma githago L.

Lamium purpureum L Chenopodium album L

Polygonum lapathifolium L. ·

Spergula arvensis L.

Galium aparine L.

Apera spica-venti (L) P.B.

Poa annua L.

Setariaglauca (L) P.B.

Bromus secalinus L.

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

With the drug combinations occurred in comparison to the individual active ingredients an improvement in the effect, which is based on synergistic effects. The combination effect is said to be synergistic if it is better than the independent relative effect calculated from the two individual effects of the mixing partners (COLBY Weeds 15 [1967] 1, 20-22).

The calculation was carried out according to LANG et al. (Conference Report "Weed Control in Industrial Plant Production", Halle 1979).

The comparison of the expected with the actually required by the combination application rate refers to a residual weed transmission of 10 or 5% (EDgo or ED ₉₅ value). In this comparison, therefore, not the strongest synergism, but a practice-relevant effect of 90 ... 100% Bekäm'pfungserfolg relevant, with 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 savings achieved with the herbicide mixtures. Table 3 shows the effect improvement achieved with the combinations.

Example 2

While maintaining the experimental conditions described in Example 1, including the Boniturschlüssels investigations to determine selectivities of the new drug combinations in the herbicidally effective dosages

performed.

The test results are included in Tables 4 and 5.

Example 3

In two field trials, the herbicidal activity and crop plant compatibility of the active ingredient combination A + B in potatoes in preemer application were tested on areas with a high incidence of millet.

The results of the visual assessment 10 weeks after the application are shown in Table 6.

Table 1: Rating key

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

Table 2

1.1. Substance savings in the effectiveness range ED ₉₀ through the combination A + B

Mix test plants in the experiment determined dose

relationship

A: B A B

KGAs / ha

according to model saved dose calculated dose % A + B kg AS / lta 0.515 0.746 31 0.462 0.584 21 0.462 0.571 10 0.807 1,089 26 0.702 0.868 19 0.716 0.766 7

total 0,288 0.227 monocotyle 0.259 0,203 dicotyle 0.259 0,203 total 0.605 0.202 monocotyle 0.527 0,175 dicotyle 0.537 0,179

- test plants dose determined in the experiment B A + B test plants dose determined in the experiment B C A + B + C according to model according to model -4- 242163 mix KGAs / ha 0.156 0.034 0.423 calculated dose calculated dose saved dose relationship A 0.126 1,048 A 0.194 0,042 , 0.525 KGAs / ha % FROM 0,107 0.895 total 0.233 0.084 0,018 0.226 KGAs / ha 0.516 total 0.922 0.096 0.803 monocotyle 0,289 0.106 0,068 0,483 1,571 0.556 88:12 monocotyle 0.788 dicotyle 0,124 0.144 0.092 0.656 1,364 0.421 33 dicotyle 0.707 1.2. Substance savings in the effectiveness range ED ₉₀ through the combination A + B total 0.309 0.098 0.062 0.444 1,014 0.705 34 Table 2 (continued) mix monocotyle 0,420 0.059 0.166 0.592 0.769 21 relationship dicotyle 0,284 0,065 0.183 0.653 + C 0.556 A + B + C total 0.367 0,040 0.113 0.403 0.784 55: 37: 8 monocotyle 0.405 0,089 0.246 0.424 0,874 saved dose dicotyle 0,250 0.059 0.164 0.282 0.684 % total 0,089 0.078 0.214 0.370 0.493 64:22:14 monocotyle 0.059 0.459 18 dicotyle 0.078 0.424 6 46 62:10:28 31 15 20 21:21:58 24 25 41 14 39 13

Table 3

1.1. Improvement of the herbicidal action by combination A + B

mix test plants application rates B A + B weed growth calculated effect relationship A KGAs / ha , in the experiment % improvement FROM 0.227 0.515 % 21 % 56:44 total 0,288 0,203 0.462 10 17 11 monocotyle 0.259 0,203 0.462 10 8th 7 dicotyle 0.259 0.202 0.807 5 21 3 75:25 total 0.605 0,175 0.702 10 17 11 monocotyle 0.527 0,179 0.716 10 7 7 dicotyle 0.537 0.126 1,048 5 28 2 88:12 total 0.922 0,107 0.895 10 25 18 monocotyle 0.788 0.096 0.803 10 18 15 dicotyle 0.707 5 13

Table 3 (continued)

1.2. Improvement of the herbicidal action by the combination A + B + C

mix test plants application rates B C A + B + C weed growth calculated effect 1 relationship A KGAs / ha in the experiment % verbesseruni 28 A + B + C 0.156 0.034 0,432 % 15 % 14 55: 37: 8 total 0.233 0.194 0,042 0.525 10 6 5 3 monocotyle 0,289 0.084 0,018 0.226 5 33 7 dicotyle 0,124 0.106 0,068 0,483 5 24 12 64:22:14 total 0.309 0.144 0.092 0.656 10 8th 10 monocotyle 0,420 0.098 0.062 0.444 5 12 61 dicotyle 0,284 0.059 0.166 0.592 5 22 4 62:10:28 total 0.367 0,065 0.183 0.653 10 15 38 monocotyle 0.405 0,040 0.113 0.403 5 66 5 dicotyle 0,250 0,089 0.246 0.424 5 9 21:21:58 total 0,089 0.059 0.164 0.282 5 43 monocotyle 0.059 0.078 0.214 0.370 5 15 dicotyle 0.078 10

Table 4 Determination of Selectivities of Combination A + B

A: B kgAS / ha potato carrot

(Bonitumoten)

Mustard bean

oats

Corn

0.895 0.702 0.462

5 5 4

8 6 4

9 9 9

Table 5 Determination of Selectivities of Combinations A + B + C

A: B: C kgAS / ha potato carrot

(Bonitumoten)

Bean

Corn

55: 37: 8 64:22:14 62:10:28 21:21:58

0.525 0.656 0.653 0.424

7 8

4 5 8 8 9 7

7 9

Table 6 Herbicidal action and potato compatibility of combination A + B

probe member

KGAs / ha

Herbicidal action (% control)

Selectivity (credit score)

0.6 + 0.4 1.2 + 0.8 1.8 + 1.2

83 88 90

9 9 9

Claims (2)

Invention claim: 1. Selective herbicide combinations for the control of monocotyledonous and dicotyledonous weeds in cultivated crops, characterized in that they are in addition to conventional excipients and carriers as active ingredients 3-chloro-pyridazinyl-6-phenyl ether of the formula I. and N- (4-bromophenyl) -N ', N'-dimethylurea of the formula II and optionally 2-methylthio-4,6-bis (isopropylamino) -1,3,5-triazine of the formula I S-CH,