HU204670B - Activated herbicidal composition comprising n-(phosphonomethyl)-glycine as active ingredient for exterminating hardly destroyable wheeds - Google Patents

Abstract

Herbicides esp. for persistent weeds as couch-grasses contain (all wt.%): 1-70 N-(phosphono-methyl)-glycerinem and 4-methyl-7-hydroxy (2H) -benzopiran-2-one in 10:1 - 1:1 proportion. Carriers, and wetting agents are also present

Description

FIELD OF THE INVENTION The present invention relates to compositions containing water soluble salts of N- (phosphonomomeol) glycine and 4-methyl-7-hydroxy- (2H) -benzopyran-2-one as active ingredients for killing difficult to control weeds.

The eradication of hard-to-control weeds in plant-borne combs is a difficult task, as the increase in herbicide doses is limited by economic and environmental considerations.

Various additives are used to enhance the efficacy of the herbicides used. These additives generally do not modify the internal movement of the herbicides, but rather their adherence to the plant. Such additives include fats, oils, surface tension reducing agents and adhesives. 15

However, additives are known which, while not being herbicides in themselves, have a physiological effect on the biological activity of N- (phosphonomethyl) glycine. Hyen compositions are described in Hungarian Patent Nos. 182,980 and 195,400. In these compositions, N- (phosphonomethyl) glycine is combined with alpha-naphthyl acetic acid and the like. Efficiency gains have been observed when used in combination with 2-chloroethylphosphonic acid and 2,4-dichlorophenoxyacetic acid Similar observations are reported in U.S. Pat. No. 3,929,450. U.S. Pat. the use of -2-chloroethylphosphonic acid modifies the efficacy of N- (phosphonomethyl) glycine. Our studies have found that combining water-soluble derivatives of N- (phosphonomethyl) glycine with water-soluble derivatives of 4-methyl-7-hydroxy (2H) -benzopyran-2-one improves the effectiveness of weed control. This improvement in efficiency occurs despite the fact that 4-methH-7-hydroxy- (2H) -benzopyran-2-one has no herbicidal activity alone. The literature clearly indicates that this compound affects the auxin circulation of plants, e.g. Physiol. Plant 50: 107-112.1980, Joum. of Exp Bot Vol 3, No. 8, p. 246-252. 1952, Phyto- 40 chem. 1968. Vol 7. pp. 567-573, Plant Physiol (1966) 41.1513-1919.

In our experiments with formulations of the present invention, we have found that the auxin levels of weeds are increased by the action of 4-45 methyl-7-hydroxy- (2H) -benzopyran-2-one, which inhibits the activity of plant auxin oxidase enzymes.

This level increase justifies the more intense root flow of the assimilates. As a result, a greater proportion of N- (phosphonomethyl) glycine sprayed on the foliage reaches the root system with a flow of assimilate per unit time, resulting in quicker and more effective weed killing than when N- (phosphonomethyl) glycine is used alone. 55

The present invention relates to herbicidal compositions containing N- (phosphonomethyl) glycine and 4-methyl-7-hydroxybenzopyran-2-one which are suitable for killing difficult to control weeds, especially apricots, in an amount of 10: 1 to 1% by weight as an active ingredient. Containing 1 to 60% by weight of N- (phosphonomethyl) glycine or its salt, 4-methyl-7-hydroxybenzopyran 2-one, solid or liquid carriers - fillers and / or diluents - and surfactants - with ionic or non-ionic surfactants

The application rate of the activated preparation is 1 to 3 kg of active ingredient / ha. Particularly preferred are the compositions having an active ingredient content of 10-40% by weight and 0.25-0.50 parts by weight of 4-methyl-7 based on N- (phosphonomethyl) glycine. -hydroxybenzopyran-2-one as well as a carrier and a surfactant.

The composition of the invention is suitable for killing hard-to-control weeds, especially peaches. The composition is used to treat weeds during the growing season. Treatment with the active ingredients may also be carried out separately.

The compositions of the invention are prepared in the form of a solution, suspension or wettable powder in the usual liquid or solid form.

To prepare the formulations, the active compounds are mixed with diluents and surfactants are added.

The composition is sprayed and sprayed onto the plant.

The appropriate doses depend on environmental factors, climatic conditions and the state of development of the weeds.

The preparation of the compositions is illustrated in the following examples.

EXAMPLE EXAMPLE A 200 g of glyphosate are suspended in 400 g of deionized water.

Under cooling and stirring, 69.8 g of monoisopropylamine are added. 10 g of ethoxylated nonylphenol are added and the mixture is diluted to 11 with deionized water.

Preparation B

100 g of 4-methyl-7-hydroxy (2H) -benzopyran-2-one are suspended in 300 g of deionized water. 33.5 g of monoisopropylamine are added under cooling and stirring. 10 g of ethoxylated nonylphenol are added and the mixture is diluted to 11 with deionized water.

Example 2

Preparation of WSC Preparation

200 g of glyphosate and 100 g of 4-methyl-7-hydroxy (2H) -benzopyran-2-one are suspended in 450 g of deionized water. Under cooling and stirring, 243.3 g of monoisopropylamine are added, 10 g of ethoxylated nonylphenol are added and the mixture is diluted to 11 with deionized water.

Example 3

Preparation of WSC Preparation

200 g of glyphosate and 50 g of 4-methyl-7-hydroxy- (2H) -benzopyran-2-one are suspended in 400 g of deionized water. While cooling and stirring, 224.2 g was added

HU 204 670 B monoisopropylamine. Add 10 g of ethoxylated nonylphenol and dilute to 11 with deionized water.

Example 4

Preparation of WP Preparation g Glyphosate g 4-Methyl-7-hydroxy- (2H) -benzopyran-2-one g Synthetic Silicic Acid g Alkyl Naphthyl Sulfonic Acid Na Salt g Lignin Sulfonic Acid Na Salt g Polyvinyl Alcohol g Kaolin

In the Ultroplex LV 100 type milling machine, the two passes are milled to a particle size of less than 30 microns. A formulation containing 70% of the active ingredient is obtained.

Biological tests

Example 5

The effect of the preparation of Example 3 on common wheat (Agropyron repens AGRE) was investigated in 30 cm diameter culture pots in a greenhouse. The shoots of the plants were 30 cm at the time of spraying. The formulations were applied with 500 l / ha water. On the 21st day after the treatments, the effect of the formulations was evaluated, expressed as% mortality. Subsequently, the percent recovery rate was evaluated. The percentage of deaths indicates the percentage of the above-ground parts of the sprayed weeds that die. It is known that the root system of tarragon weeds creeps far into the soil and is capable of developing a new plant from each root bud. If the herbicide cannot get to these root buds but only destroys some of the root buds above the ground, the plant will sprout again. The appearance of new shoots is thus an indicator of the ineffectiveness of a given herbicide. The assays were performed in 6 replicates and were considered to be replicates where at least one shoot per dish was developed. In the studies, N- (phosphonomethyl) glycine was used as Formulation A alone.

The mono (isopropylammonium) salt of the B-preparation of the benzopyran derivative was used.

Note: The weight percentages are in each case the salt-free mass of the compound.

The formulation containing N- (phosphonomethyl) glycine was designated A by 4-methyl-7-hydroxy- (2H) benzopyran-2-one B.

The treatments were as follows:

1. Control

2. Application 20 WSC 5.01 / ha (1.0 kg ai./ba)

3. Preparation 20 WSC 10.01 / ha (2.0 kg ai./ha)

4. Preparation 20 WSC 20.01 / ha (4.0 kg ai./ha)

5. Preparation B 10 WSC 10.01 / ha (1.0 kg ai./ha)

6. Preparation B 10 WSC 20.01 / ha (2.0 kg ai./ba)

7. Preparation B 10 WSC 40.01 / ha (4.0 kg ai./ha)

8. No. 3 Example 25 WSC 4.01 / ha (1.0 kg ai / ha)

9. No. 3 Example 25 WSC 8.01 / ha (2.0 kg ai / ha)

10. No. 3 Example 25 WSC 16.01 / ha (4.0 kg ai / ha)

Number of treatments % mortality Fold% 1 0.0 100 2 34 83 3 65 50 4 100 34 5 0.0 100 6 0.0 100 7 0.0 100 8 59 34 9 93 0.0 10 100 0.0

The composition of the present invention had already killed 100% of the shoots of the wheat at a dose of 8.0 l / ha (2 kg of active ingredient / ha). The Ichomas (root system) were completely damaged, as evidenced by the percentage of grafting.

Example 6

Under the conditions described in the previous example, the composition of Example 3 was tested with the exception that Sorghum halepense SORHA was used as a test plant.

The treatments were as follows:

1. Control

2. Preparation A 20 WSC 2.51 / ha (0.5 kg ai./ha)

3. Preparation A 20 WSC 5.01 / ha (1.0 kg ai./ha)

4. Preparation A 20 WSC 10.01 / ha (2.0 kg ai./ha)

5. Preparation B 10 WSC 5.01 / ha (0.5 kg ai./ha)

6. Preparation B 10 WSC 10.01 / ha (1.0 kg ai./ha)

7. Preparation B 10 WSC 20.01 / ha (2.0 kg ai./ha)

8. Example 2 formulation 30 WSC 1.7 l / ha (0.5 kg ai / ha)

9. Example 2 formulation 30 WSC 3.4 L / ha (1.0 kg ai / ha)

10. Example 2 Formulation 30 WSC 6.8 L / ha (2.0 kg ai./ba)

Number of treatments Death% Rebound%

1 0.0 100 2 15 100 3 38 83 4 61 50 5 0.0 100 6 0.0 100 7 0.0 100 8 39 50 9 76 34 10 100 0.0

Using the combination according to the invention, which is less susceptible to N- (phosphonomethyl) glycine, it can be concluded that its efficacy was better than that of N- (phosphonomethyl) glycine.

Claims (1)

Patent Claim Point Herbicidal compositions for the eradication of weeds, in particular of tares, characterized in that they are active in a concentration of 1 to 70% by weight, 10: 1 to 5% by weight. They contain 1: 1 by weight of N- (phosphonomethyl) glycine and 4-methyl-7-hydroxy (2H) -benzopyran-2-one with solid or liquid carriers and surfactants.