DD219655A1 - HERBICIDE MEDIUM - Google Patents

Abstract

The invention relates to herbicidal agents, in particular for weed control in vegetable crops. As active ingredients, they contain a combination of 1,1-dimethyl-3-phenylthiourea (I) and 2- (2,2,2-trichloro-1-hydroxyethylamino) -4-phenylamino or -4- (m-methyl) phenylamino) -1,3,5-triazine (II), wherein the mixing ratio of the active ingredients I: II is preferably 2: 1.

Description

VEB GHBMIEKOMBIMT BITTERJ v ELD Bitter * eld, 25. 7. 1983 /

2461

Herbicidal agent Field of application of the invention .

The invention can be used for controlling monocotyledonous and dicotyledonous weeds in cultivated plant stands, in particular in vegetable crops.

Characteristic of the known technical solutions

1-Phenyl-3,3-dimethylthiourea (i'enthiuron) has long been known as herbicidal active ingredient (DD-PS 110 155, US-PS 2891 855).

However, thiourea-based herbicides have the disadvantage that relatively high application rates are required and their spectrum of action also has considerable gaps, in particular with regard to their action against monocotyledonous weeds "" Gazette for Plant Protection in the GDR, p. 1979) J ^.

The use of differently substituted triazines as herbicidal active ingredients has also been known for some time. Triazines with 'chloralsubstituted' amino groups as substituents have been proposed, for example, for weed control in maize crops (BG-UHS 16210).

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Aim of the invention;

The aim of the invention is to develop new herbicidal compositions, in particular for weed control in vegetable crops, which act at low application rates at the same time against mono- and dicotyledonous weeds.

Explanation of the essence of the invention

This object is achieved in that the herbicidal composition in addition to conventional excipients and carriers as the active ingredient is a combination of iji-dimethyl-3-phenylthiourea (I) and a 1,3,5-triazine of the general formula II

R - C ₆ H ₄ HN-U sy- ^ - OE - ^CC1 3 C ¹¹ )

in which RsH or CHo means contain.

The mixing ratio of the active ingredient I: II is preferably 2 s 1; the application rates of the agents according to the invention are between 2.5 and 4 kg AS / ha ·

It has surprisingly been found that the combination of the two active ingredients has a synergistic effect and, in addition, gaps in the activity spectrum are closed.

The application of the herbicidal compositions according to the invention is carried out in 3% of the usual PSM formulations (wettable powders, emulsions, suspensions) which are prepared by the addition of excipients and surfactants to the active substances with subsequent homogenization and dispersed in water before administration become.

The particular application forms depend on the intended use. The preparation of the solid preparations is carried out in a known manner by grinding and mixing.

Augführungsbeispiel

The experiments were carried out under field conditions on sandy loam on 20-m -pats with 4 repetitions. The treatment took place after the planting of the tomatoes;) ungrafted or before the potato casserole. The active substances, formulated as 50% wettable powders, were suspended in water (1000 l / ha). The spraying was carried out by means of a backpack sprayer. The combinations of 1-phenyl-3,3-dimetyl-thiourea were tested with 2- (phenylamino) -4- (2 ^f , 2 », 2'-trichloro-i ^t hydroxyethylamino) sym-triazine or with 2- (m-methyl-phenylamino) -4- (2 ', 2 ", 3'-trichloro-1'-hydroxyethylamino) -ozyme, triazine and compared with the effect of the individual components. Tables Ϊ and II give the mean values of weed stocking for 10 dicotyledonous and 3 monocotyledonous weeds in tomato and potato plantations.

The study included the following weeds:

Amaranthus retroflexus Atriplex patula Galinsoga parviflora Hibiscus trionum Portulaca oleracea Sonchus arvensis Sinapis arvensis Capsella bursa-pastoris Cirsium arvense Convulvulus arvensis Echinochloa crus-galli Panicum sanguinale Setaria viridis

- Krummer Foxtail

- Spreading message

- Small flowered buttonweed

- Yellow hour flower

- vegetables Portulac

- Field foxing thistle

- Ackersenf

- Shepherd's purse

- Field scratch thistle

- field winch

- European millet

- Blackthorn

- Green bristle millet

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The improvement in the herbicidal action of the compositions according to the invention is based on a synergistic effect.

According to Colby's method of calculation (Weeds 15, 1, 20-22, 1967) synergism can be demonstrated as follows:

¹ 100 where

a weeds on compound A with dose ρ »Weed on compound B with dose q

s expected additive weed population after application of compounds A + B in dose ρ + q

= experimentally determined weed stocking after the application of compounds A + B in dose ρ + q,

Is EXj E ^, then there is synergism, E ^ ₁ = E _Rf so the effect is additive, E ^ is is He "is ^s0 · antagonism before.

For the calculation, the data of the weed stock on 30 days after the treatment were used.

The crops (tomatoes or potatoes) remained undamaged in all cases.

Table I! 'Herbicidal Activity of Invention Agents A + B vs. Linarone (G)

< C mix test plants A B y ₁ < Weed trimmings £ A + B A found 7 , 82, 97, 03 + 41, + 5, + 17, y I Vn I application rate 1.5 Ratio A: B (Weeds) 80.4-3 12.13 36.67 56, 49, 51, 97 25 90 C 4.25 0.00 1.33 calculated 57 97 70 (ig / ha) AB 2: 1 monocot dikotyle mono- + dicotyle 19.2 6.8 10.66 45 5 19 1,666 0.833

A - 2- (2,2,2-trichloro-1-hydroxyethylamino) -4-phenylamino-1,3,5-triazine B = 1,1-dimethyl-3-phenylthiourea

C = N ^t -25 »4-dichloro-phenyl _< 17-N-methoxy-N-methylurea

Table II: Herbicidal efficacy of the combination A + B according to the invention compared to linuron (G) '

Application rate (ig / ha)

A B C

MisCh. Test plants ratio (weeds) AsB

Weed stock £ *% J7

A + B

-He

found calculated

1,666 0.833 1.5 2: 1

monocot dikotyle

mono- + dicots

90.36 56.97 19.2 10.64 50.93 + 40.29

18.14 49.25 6.8 1.45 8.93 + 7.48

43.10 51.90 10.66 4.33 22.37 + 18.04

A = 2- (2,2,2-trichloro-1-hydroxyethylamino) -4- (m-methylphenylamino) -1,3,5-triazine

B s 1,1-dimethyl-3-phenylthiourea

C s N ^f - ^ "3,4-Dicblor-phenyl-J7-N-methoxy-N-methylurea

Claims (1)

, - 7 - 2461 ErfJndunKsanspruch Herbicidal agents, in particular for controlling weeds in vegetable crops, characterized in that they contain, in addition to customary auxiliaries and excipients, as active ingredient a combination of 1,1-dimeth-yl-3-pbenylthiourea (I) and a 1,3,5-triazine of the general formula Formula Il N ν Ν R - TTKT I I TlTTT ΛτΤ Λ · / "· Ί / ττ \ where R = H or CH ^, wherein the mixing ratio of the active ingredients I: II is preferably 2: 1 ·