DE2528302A1 - Selective herbicide for beet and soya beans - contg. 3-methyl 4 amino 6 phenyl 1,2,4 triazin 5 one and 4 methoxy benzyl diethyl thiolcarbamate - Google Patents

Abstract

New agents for selectively combatting weeds in beets and soya beans contain an active substance combination consisting of (a) 3-methyl-4-amino-6-phenyl-1,2,4-triazin-5-one (I) and (b) S-(p-methoxybenzyl)N,N-diethylthiolcarbamate (II). There is true synergism between (I) and (II), and their combinations display a particular y broad and selective herbicidal action in beet and soya bean cultures. Activity against difficult grassy weeds (e.g. Avena fatua, Digitaria sanguinalis) and broadleaved weeds (e.g. Galium aparine) is particularly advantageous. The ratio of (I) to (II) is pref. 1:0:1 to 1:10, esp. 1:0.1 to 1:5 w/w.

Description

Means for selective weed control in beets and soybeans The The present invention relates to a new herbicidal Nirkstoffkombinaion from a known 3-alkyl-1,2,4-triazin-5-one on the one hand and a known Uhiolcarbamat On the other hand, there is, and a particularly good herbicidal, effective for selective Has weed control in beets and soybeans.

It has already become known that 3-alkyl-112,4-triazin-5-ones, e.g. 5-methyl-4-amino-6-phenyl-1,2,4-triazin-5-one, as selective herbicides in Süben can use (see German Offenlegungsschrift 2 224 161).

It is also known that thiol carbamates, e.g. S- (p-methoxybenzyl) -N, N-diethyl thiol carbamate, can use as herbicides (cf. German Offenlegungsschrift 1 995 892).

At low application rates and concentrations, the selective one herbicidal effectiveness of the aforementioned substances in combating weeds in beets but not always entirely satisfactory.

It has now been found that the new active ingredient combination of (1) 3-methyl-4-amino-6-phenyl-1,2,4-triazin-5-one of the formula and (2) S- (p-methoxybenzyl) -N, N-diethyltniolcarbamate of the formula has a particularly broad and selective herbicidal action in beet and soybean crops.

The effectiveness of the active ingredient combination according to the invention is surprising much higher than the sum of the effects of the individual active ingredients. It lies an unpredictable real synergistic effect before and not just an effect supplement.

The combination of active ingredients is a valuable asset beet herbicides and herbicides for soybean cultivation.

The active ingredients contained in the active ingredient combination according to the invention are already known (cf. German Offenlegungsschriften 2 224 161 and 1 995 892).

The synergistic effect is particularly strong with certain Combination ratios. However, the weight ratios of the active ingredients in the combination of active ingredients fluctuate in relatively large areas. In general account for 1 part by weight of active ingredient of the formula (I) 0.1 to 10 parts by weight, preferably 0.1 to 5 parts by weight of active ingredient of the formula (II).

The active ingredient combination according to the invention shows a very good effect against weeds and grass weeds without damaging the beets and soybeans. she can therefore be used for selective weed control in beet and soybean crops will.

Particularly suitable weeds are: dicots such as mustard (Sinapis), Cress (Lepidium), bedstraw (Galium), chickweed (Stellaria), chamomile (Matricaria), dog chamomile (Anthemis), buttonwort (Galinsoga), goose foot (Chenopodium), nettle (Urtica), ragwort (Senecio), foxtail (Amaranthus), purslane (Portulaca), pointed burdock (Xanthium), Morning glory (Convolvulus), morning glory (Ipomoea), knotweed (Polygonum), sesbania (Sesbania), Ambrosia (Ambrosia), scrub thistle (Cirsium), thistle (Carduus), goose thistle (Sonchus), Nightshade (Solanum), pond cress (Rorippa), Rotala, boxweed (Lindernia), Dead nettle (Lamium), speedwell (Veronica), beautiful mallow (Abutilon), Emex, thorn apple (Datura), violets (Viola), hemp nettle, hollow tooth (Galeopsis), poppy seeds (Papaver), knapweed (Centaurea). Monocots such as chicken millet (Echinochloa), bristle millet (Setaria), millet (Panicum), fingergrass (Digitaria), timothy grass (Phleum), bluegrass (Poa), fescue (Festuca) Eleusine, Brachiaria, Lolch (Lolium), Trespe (Bromus), Oats (Avena), Sedge grass (Cyperus), black millet (sorghum), couch grass (Agropyron), dog tooth grass (Cynodon), Monocharia, fimbristylis, arrowhead (Sagittaria), swamp reed (Eleocharis), ledges (Scirpus), Paspalum, Ischaemum, Sphenoclea, Dactyloctenium, ostrich grass (Agrostis), Foxtail grass (Alopecurus), wind stalk (Apera).

Particularly noteworthy is the good effectiveness of the invention Combination of active ingredients against difficult-to-control grass weeds, e.g. B. Wild oats (Avena fatua) and finger millet (Digitaria sanguinach £), as well as against weeds that are difficult to control, z. B. Burdock weed (Galium aparine). It is of particular advantage that such weeds and weeds that are usually difficult to control with the inventive method Combination of active ingredients can be combated at the same time.

The active ingredient combination according to the invention can be used in the customary formulations such as solutions, emulsions, suspensions, powders, pastes and granulates. These are made in a known manner, e.g. B. by mixing the active ingredients liquefied pressurized liquids with extenders, i.e. liquid solvents Gases and / or solid carriers, optionally using surface-active substances Agents, that is to say emulsifiers and / or dispersants and / or foam-generating agents Means. In the case of the use of water as an extender, z. B. also organic Solvents can be used as co-solvents. As a liquid solvent are essentially: aromatics, such as xylene, toluene, benzene or alkylnaphthalenes, chlorinated aromatics or chlorinated aliphatic hydrocarbons, such as chlorobenzenes, Chlorethylene or methylene chloride, aliphatic hydrocarbons such as cyclohexane or paraffins, e.g. B. petroleum fractions, alcohols such as butanol or glycol and their Ethers and esters, ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone or Cyclohexanone, strongly polar solvents such as dimethylformamide and dimethyl sulfoxide, as well as water; with diluted gaseous extenders or carriers Such liquids are meant which are at normal temperature and under normal pressure are gaseous, e.g. B. aerosol propellants such as dichlorodifluoromethane or trichlorofluoromethane; as solid carrier materials: natural rock flour, such as kaolins, clays, talc, Chalk, quartz, attapulgite, montmorillonite, or diatomaceous earth, and synthetic rock flour, such as finely divided silica, aluminum oxide and silicates; as emulsifier: non-ionic and anionic emulsifiers, such as polyoxyethylene fatty acid esters, polyoxyethylene fatty alcohol ethers, e.g. alkylaryl polyglycol ethers, alkyl sulfonates, alkyl sulfates, aryl sulfonates and Protein hydrolysates; as a dispersant: e.g. B. lignin, sulphite waste liquors and methyl cellulose.

The active ingredient combination according to the invention can be used in the formulations present in a mixture with other known active ingredients.

The formulations generally contain between 0.1 and 95 percent by weight Active ingredient, preferably between 0.5 and 90.

The active ingredient combination can be used as such, in the form of their formulations or the application forms prepared therefrom, such as ready-to-use solutions, emulsions, Foams, suspensions, powders, pastes and granules. The application happens in the usual way, for. B. by dusting, atomizing, spraying, pouring and scatter.

The application rates of the active ingredient combination according to the invention can can be varied within a certain range. Generally they are between 0.1 and 10 kg / ha, preferably between 1 and 10 kg / ha.

The application of the active ingredient combination according to the invention can before and / or after the plants emerge.

The good herbicidal effect of the combination of active ingredients comes from the following ends Examples. While the individual active ingredients weaken the herbicidal effect have, the combination shows a very broad weed effect that over a simple effect isolation goes beyond.

With herbicides there is always a synergistic effect when the herbicidal effect of the active ingredient combination is greater than that of the individually applied Active ingredients.

The expected effect for a given combination of two herbicides can (cf. Colby, S. R., "Calculating synergistic and antagonistic responses of herbicide combinations ", Weeds 15, pages 20-22, 1967) can be calculated as follows: If X =% damage by herbicide A at p kg / ha application rate and Y =% damage by herbicide B at q kg / ha application rate and E = the expected damage to the herbicides A and B at p and q kg / ha application rate, then E = X + Y - X..

100 If the actual damage is greater than calculated, then the combination is superadditive in its effect, i.e. it is a synergistic one Effect before.

From the tables of Examples A and B it is clear that the Herbicidal activity found of the active compound combination according to the invention on weeds is greater than the calculated one, i.e. there is a real synergistic effect.

Example A Pre-emergence test Solvent: 5 parts by weight of acetone Emulsifier: 1 part by weight of alkylaryl polyglycol ether Active ingredient preparation is mixed 1 part by weight of active ingredient with the specified Amount of solvent, add the specified amount of emulsifier and dilute the concentrate with water to the desired concentration.

Seeds of the test plants are sown in normal soil and after Doused with the active ingredient preparation for 24 hours.

The amount of water per unit area is expediently kept constant. The concentration of active ingredient in the preparation is irrelevant, only the amount of active ingredient applied per unit area is decisive. After three weeks, the degree of damage to the plants is rated in% damage in comparison to the development of the untreated control. The figures mean: 0 ffi = no effect (like untreated control) 100 6 = total destruction Active ingredients, application rates and results are shown in the table below: Table A pre-emergence test Active ingredient or application rate soy beets Avena fatua Digitaria sanguinalis Galium aparine Active ingredient kg / ha found * calc. * Found * calc. * Found * calc. * combination (I) 2.8 0 0 70 20 40 (known) 2.1 0 0 60 0 20 1.4 0 0 40 0 0 (II) 2 0 0 0 90 0 (known) 1.5 0 0 0 90 0 1 0 0 0 90 0 (I) + (II) 2.8 + 2 0 0 85 70 100 92 100 40 invented 2.1 + 1.5 0 0 80 60 100 90 100 20 manure according to 1.4 + 1 0 0 50 40 95 90 80 0 * found = damage found * calculated = damage calculated using the formula given on page 6 Example B Post-emergence test Solvent: 5 parts by weight acetone Emulsifier: 1 part by weight alkylaryl polyglycol ether To produce an appropriate preparation of active ingredient, 1 part by weight of active ingredient is mixed with the amount indicated Solvent, add the specified amount of emulsifier and dilute the concentrate with water to the desired concentration.

Test plants which have a Height of 5-15 cm have such that the amounts of active ingredient given in the table can be applied per unit area. The concentration of the spray liquor will be like this chosen that the amounts of active ingredient given in the table in 2000 1 water / ha be applied.

After three weeks, the degree of damage to the plants is rated as 6 damage in comparison to the development of the untreated control. The figures mean: O 6 = no effect (like untreated control) 100 6 = total destruction Active ingredients, application rates and results are shown in the table below: Table B post-emergence test Active ingredient or Application rate of beets Avena fatua Digitaria sanguinalis Galium aparine Active ingredient combination kg / ha collected * calc. * collected * calc. * collected * calc. * (I) 2.1 0 20 80 80 (known) 1.4 0 0 70 80 (II) 1.5 0 0 80 40 (known) 1 0 0 70 30 (I) + (II) 2.1 + 1.5 0 40 20 100 96 100 88 (known) 1.4 + 1 0 20 0 90 91 100 86 * found = damage found * calc. = damage calculated using the formula given on page 6

Claims (1)

Claims: Oil means for selective weed control in beets and soybeans, characterized by a content of an active ingredient combination consisting of (1) 3-methyl-4-amino-6-phenyl-1,2,4-triazin-5-one of the formula and (2) S (p-xethoxybenzyl) N, N-diethyl thiol carbamate of the formula 2) Agent according to claim 1, characterized in that in the active ingredient combination the weight ratio of active ingredient of formula (I) to active ingredient of formula (II) between 1: 0.1 and 1:10, preferably between 1: 0.1 and 1 : 5 lies. 3) methods of selective control of weeds in beets and soybeans, characterized in that an active ingredient combination according to claim 1 or 2 can act on the weeds or their habitat. 4) Use of an active ingredient combination according to claim 1 or 2 for selective weed control in beets and soybeans. 5) Process for the preparation of means for selective weed control in beets and soybeans, characterized in that there is a combination of active ingredients according to claim 1 or 2 mixed with extenders and / or surface-active agents.