DD218265A1 - SELECTIVE HERBICIDE COMBINATIONS - Google Patents

Abstract

The invention relates to selective herbicide combinations, in particular to annealing weed. As active ingredients they contain mixtures of substituted cyclohexylureas and benzofuran derivatives.

Description

The invention relates to novel herbicide combinations for the selective weed control of monocotyledonous and dicotyledonous weeds in arable crops, in particular beetroots, legumes and permanent crops.

Characteristic of the known technical solutions:

The N-cyclohexyl-N ¹ , N'-dimethylurea is described as a herbicide against dicotyledonous weeds in US-PS 26 61 272. Furthermore, it is known that arylurea derivatives are generally dicotyledonous weeds better than monocot species to combat (DD-PS 11 15 42; DD-PS 10 22 75; DD-PS 11 01 56; DD-PS 11 01 59).

The herbicidal activity of benzofuran derivatives against mono- and dicotyledonous weeds was also recognized in the mid-seventies (US Pat. No. 3,235,363, JA-PS 4261/67).

Object of the invention:

The aim of the invention is to develop new selective herbicide combinations that simultaneously destroy annoying mono- and dicotyledonous weeds.

2aNlRl 1983 * 0 Ψ \

Explanation of the essence of the invention:

It has been found that the selective herbicide combinations in addition to conventional excipients and carriers as active ingredient substituted cyclohexylureas of the general formula I.

/. VnH-CO-NR ¹ R ² Formula I

1 Ό 2 ''

in the R and R are independently hydrogen or

C.-C 1-6 -alkyl and '. :

2-Ethoxy-2,3-dinydro ~ 3,3-dimethylbenzofuran-5-yl-methanesulfonate of the formula H ₁

CH ₃ -SO ₂ -O,

Formula II

contain.

For these combinations, not only is an addition of the different effects obtained, but there are real synergistic effects, both in terms of the effect against monocotyledonous and against dicotyledonous harmful plants. In the combination of active substances according to the invention, the well-known good effect of 2-ethoxy-2,3-dihydro-3,3-dimethylbenzof uran-5-yl-methanesulfonate against grass weeds by the interaction with the anti-dicot weed species N-cyclohexyl-N ", N'-dimethylurea supplemented, whereby a substantial reduction in the application rate per unit area was determined.

The application of the herbicide combinations is advantageously carried out in the customary for weedkillers preparation or application forms, such as solutions, emulsions, suspensions or spray concentrates, the

Addition of liquid and / or solid carriers or diluents usually prepares with the addition of surfactants and other formulation auxiliaries and can be diluted for use with water. The application forms vary with the intended use. It is essential in any case to ensure a fine distribution of the active substance mixture. The preparation of the various preparations is carried out in a conventional manner by mixing and milling. 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 about 60 %, the herbicidal activity of combinations of N-cyclohexyl-N ¹ , N-dimethylurea (A) and 2-ethoxy-2,3-dihydro -3,3 ~ dimethylbenzofuran-5-yl methanesulfonate (B) pre-emergence compared to the individual components.

The formulation of the formulated active ingredients was carried out as a tank mix in 1000 l of water per hectare in the spray booth immediately after sowing the test plants. The following key was used to assess the herbicidal activity:

Boniturnote Schad strength 1 destroyed 2 ' I 3 5 6 7 8th 9 unharmed

Table 1 "Rating key

___ weeds are sown ζ

0 5

15 30 50 70 85 95 100

The testing was carried out on the weed species

Stellaria media, (L.) Senecio vulgaris L. Anthemis arvensis L.: Thlaspi arvense L. Agrostemma githago L. Lamium purpureura L. Chenopodium album L. Polygonurn lapathifolium L. Spergula arvensis L. Galium aparine L. Apera spica-venti ( L.) PB Poa annua L.

Setaria glauca (L.) P.B. ,

Bromus secalinus L

 Echinochloa crus-galli (L.) P.B.

The combination of the active ingredients compared to the individual active ingredients an improvement in the effectiveness of weeds was found, which is based on synergistic effects. The combination effect is then said to be synergistic if it is better than the independent relative effect calculated from both individual effects of the mixing partners

(COLBY, Weed 15/1967/1, 20-22) or equivalent effect (TAMMES, - Meth. J. Plant Path., 70 / 196V, 73-80). 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 rates refers to a residual weed stock of 10 % EDg ^ value.

In this comparison, therefore, not the strongest synergism, but a practice-relevant effect of 90-100 % control success prevail, the average values of Testpflanzeri are given. The credit rating of 30 days after application was used for the calculation.

Table 2 shows the substance savings achieved with the herbicide combinations.

Table 3 shows the effect improvement achieved with the combinations.

Table 2 Substance savings with the herbicide combination of A. + B in the ED range

: 10 test plant Dose 'A (kg in experiment B A + B AS / ha) 1.2 Dose calculates independently equivalent. A + B A + B (kg AS / ha) 0.9 1.1 1.2 saved dose independently equivalent. A + B A + B - 33, - 45 - 33 ·. I σ> : 30 total monocotyl dicotyl 1.1 1.4 1.4 0.1 0.2 0.2 0.9 0.8 1.6 0.8 0.9 1.2 1.0 0.6 2.1 - 50 - 78 - 33 10 - 33 24 I Mixing ratio A: B : 50 total monocotyl dicotyl 0.6 0.56 1.1 0.3 0.24 0.5 1.2 0.8 1.6 0.8 • 0.6 1.8 1,2. 0.7 1.2 - 13 "- 33 11 0 - 14 - 33 90 : 70 total monocotyl dicotyl 0.6 0.4 0.8 0.6 0.4 0.8 1.1 0.5 1.0. 0.7 1.2 1.5. 0.5 2.0 - 20 - 14 - 33 27 0 20 70 : 90 total monocotyl dicotyl 0.3 0.15 0.5 0.1 0.35 1.1 1.3 0.5 1.6 1.2 0.6 1.8 1.9 0.6 1.7 8 17 11 32 17 6 50 total monoko'tyl dicotyl 0.13 0.15 0.16 1.17 0.35 1.44 2.0 0.7 1.8 35 29 11 30 10

Table 3 Effect improvement with the herbicide combination A + B

: 10 test plants Dose A • (kg in experiment B A + B AS / ha) 1.6 1.6 1.6 Weed stock in the experiment is calculated independently. equiv. 2 1 3 2 1 - 3 Impact improvement independent equiv. - 2 - 1 - 2 I -O I : 30 total monocot. dicot 1.4 1.4 1.4 O O ro ro 1.6 0.8 1.6 '4 2 5 2 2 3 4 4 4 CM v- OJ I I I 2 - 4 2 Mixing ratio A: B 9 : 50 total monocotyl dicotyl 1.1 0.6 1.1 in oj in ο ο ο 1.6 0.8 1.6 OJ 00 CM 2 3 4 6 4 6 0 - 6 1 - 1 - 4 90 : 70 total monocotyl dicotyl 0.8 0.4 0.8 0.8 0.4 0.8 1.6 0.5 1.6 7 5 10 5 9 7 9 ' 7 8 _ C - 2 - 6 4 0 3 70 : 90 total monocotyl dicotyl O O O Ul O Ul Ul 1.1 0.45 1.1 1.6 0.5 1.6 4 7 .5 13 7 14 12 6 12 V-OJ OJ -j »ro -P- 50 total monocotyl dicotyl 0.16 0.05 0.16 1.44 0.45 1, 44 8 4 11 5 3 3 30 10

Example 2

In field trials, the active ingredient combination of A + B (mixing ratio 1: 4) was tested in an assortment of agricultural and horticultural crops with application rates of 2.0 and 3.0 kg ai / ha to characterize the pre-emergence selectivity.

Visual assessment of crop tolerance was carried out for 20 days. (Appointment I) and 40 Days' (Appointment II) after application according to the rating key shown in Table 1. The results are shown in Table 4.

Table 4 Crop compatibility of the herbicide grain

tion A + B (1: 4) 7 Boniturnote Appointment II 2.0 3.0 (kg AS / ha) 7 Cultivated Boniturnote Appointment I 2.0 3.0 (kg AS / ha) , , 8th 9 8th mangel 9 8th 9 8th sugar beet 9 9 9  9 spinach 9 9 9 sunflower 9 9 lupine 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 substituted in addition to conventional excipients and carriers as active ingredient cyclohexylureas of the general formula I. / VnH-CO-NR ¹ R ² Formula I 12 ^{v. Chr} in which R and R independently of one another represent hydrogen or 0 ,, - Cr-alkyl, and 2-Ethoxy-2,3-dihydro-3,3-dimethyl-benzofuran-5-yl-methanesulfonate of the formula ΪΙ CH ₃ -SO ₂ -O OC _n IL Formula II contain. 2. Selective herbicidal compositions according to item 1, characterized in that they come in combination with other pesticides and pesticides and / or agrochemicals are used.