JPS59128314A - Herbicide composition - Google Patents

Abstract

PURPOSE:A herbicide composition that contains a combination of oxadiazon with glyphosate, thus developing synergism to show excellent herbicidal effect by both soil and foliage treatments. CONSTITUTION:Oxadiazon: 5-tert.-butyl-3-(2,4-dichloro-5-isopropoxyphenyl)-1,3,4- oxadiazolin-2-one, which shows excellent herbicidal effect against a variety of pre-emergence weeds, but scarce effect on post-emergence weeds, is combined with glyphosate: N-(phosphonomethyl)glycine, which is used solely in foliage treatment of post-emergence weeds, but not by soil treatment, at a weight ratio of 1/8-8/1. Their combination accelerates the development of foliage treatment effect without anxiety of increased chemical injury.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is applicable to agricultural and horticultural fields such as fields, orchards, paddy fields, forest areas, etc.
Regarding herbicides for the forestry field and non-agricultural lands such as railway tracks, playgrounds, parks, and areas around factories, 5-tert-butyl-3-(2,4-dichloro-5-isopropoxyphenyl)- is particularly effective as an active ingredient. 1,3,4-oxadiazolin-2-one (hereinafter referred to as oxacyacin) and N-(phosphonomethyl)glycine (hereinafter referred to as glyphoate) in a weight ratio of 1 = 8 to 8:1. It is an object of the present invention to provide a herbicidal composition containing the following.

Oxacyacin, which is one of the active ingredients of the herbicide of the present invention, is a well-known soil treatment agent that exhibits excellent herbicidal effects against various weeds before they germinate. Therefore, its use is limited to before the germination of weeds, and if the timing is missed, sufficient weeding effect cannot be expected. On the other hand, glyphosate, another active ingredient, has no effect on controlling weeds before they germinate by soil treatment, and is only known as a foliage treatment agent for weeds after germination. Even if the chemical treatment is left in place, no control effect can be expected, so it must be sprayed several times each time weeds appear.In particular, it takes 10 to 14 days for the foliage treatment effect to appear, so the chemical treatment effect is not effective. It was complicated and took a lot of time to confirm.

In view of the original role that herbicides should play, such as labor saving and economical efficiency, the inventors of the present invention have conducted intensive studies on various herbicides, and have found the above-mentioned known herbicides, which have completely different functions, processing methods, effects, etc. When two drugs, oxacyacin and glyfuosate, are mixed and used together, they complement each other's properties and exhibit excellent weed control effects in both soil and foliage treatments, and each drug works synergistically. It was found that unexpectedly good results were obtained, such as an improvement in the herbicidal effect against each weed, and in particular, a faster onset of the foliage treatment effect.

Conventionally, when a mixture of drugs with different actions is applied, phytotoxicity may sometimes appear on cultivated crops that does not occur when a single agent is applied, and glyphosate, in particular, is originally non-selective to plants and cannot be used for useful crops. Due to its strong phytotoxicity, it has been carefully applied to non-agricultural lands and perennial crops such as orchards such as apples, grapes, pears, chestnuts, and tangerines, mulberry gardens, and tea plantations. Another advantage of a two-component herbicide is that there is no concern about amplification of phytotoxicity.

In the herbicide composition of the present invention, the mixing ratio of the active ingredient compounds is oxadiazone:glyphosate]:8 to 8:
It is appropriate to mix within the range of 1, and mixtures containing recompounds within this range can be used as non-selective herbicides in agriculture, horticulture, forestry fields such as fields, orchards, paddy fields, forest lands, and railways. It is used to control weeds in non-agricultural areas such as railroad tracks, parks, playgrounds, sites around factories, and cemeteries, and is also used for weed control on apples, grapes, pears,
It can also be used in areas where fruit trees such as chestnuts and tangerines are planted, as well as perennial crops such as mulberries and tea.

In addition, when applying the herbicide of the present invention, granules, wettable powders, emulsions are usually used together with adjuvants commonly used in agrochemical formulations such as solid or liquid carriers, binders, emulsifiers, and spreading agents, as necessary. ,
It is prepared and used in a suitable formulation such as Floor 7 Pal. Regarding the formulation preparation method, known means for agricultural chemical formulations may be appropriately applied. The content of both active ingredient compounds in the preparation is not necessarily limited, but is usually 0.5 to 9.0% as a mixture.
A suitable amount is about 5 wj%, preferably about 2 to 90 wt%. Further, there is no particular restriction on the amount of application, but in general, it can be said that an appropriate amount of active ingredient is 50 to 500 I per 10 ares, preferably about 100 to 200 g.

Of course, it goes without saying that the number may be increased or decreased as necessary.

Next, formulation examples of the herbicide composition of the present invention are as follows.

Example 1 (emulsion) Oxacyacin Part 10 (active ingredient) Glyphosate 15% (〃) Xylene Part 20 (〃) Water
4o Section (〃) Emulsifier Tsurupol 3
366 15% (〃) (Product name) Mix and dissolve the above ingredients uniformly to make an emulsion. 10 minutes of this with water
(Dilute 1-500 times and spray 5O-250J/10a.

Example 2 (granules) Oxacyacin 15% (active ingredient)
Glyphosate 25th unit (〃) Silica grains (30-100 mesh) 955% (〃) Polyvinyl acetate 05% (〃) or more of oxacyacin and glyphosate are added onto the silica grains using an appropriate mixer. It is spread and coated as a binder to form granules, which are then sprayed as they are at 3 to 5 kg 710 a.

Example 3 (hydrating agent) Oxacyacin 10% (active ingredient) Glyphosate 15 Thi(〃)clay
115% (〃) White carbon
325% (〃) Tsurupol 5110
10.0% (〃) (Product name) The above is mixed and pulverized uniformly to make a wettable powder. 1 of this with water
Dilute 00-500 times to 50-2501/10
Cloth number a.

Example 4 (powder) Oxacyacin 15% (active ingredient) Glyphosate 25% (〃) Clay
Spray the 96% (〃) or higher mixture as it is with 3-4 K9710a.

Test example 1 (difference in onset rate of foliage treatment effect) 600Cm
2. A plastic vat was filled with a certain amount of field soil (volcanic loam), and a certain amount of weed seeds such as crabgrass, Japanese knotweed, and blueberry were mixed in the soil surface layer 3 crn. Thereafter, when the grasshopper etc. grew to about 15 cm, a prescribed amount of each chemical was sprayed onto the weed stems and leaves using a small sprayer at a distance of 10 me per vat. Investigation is processing day 1, 3, 7
I did it a day later.

The results of the survey are shown in Table I.

Discussion Looking at the foliage killing power of oxacycin and glyphosate as single agents, the killing power of glyphosate is superior to that of oxacyacin, and it takes 7 to 10 days after treatment for its effect to be expressed.

On the other hand, when the mixture of oxacyacin and glypho7ate was applied, remarkable herbicidal activity, which was not observed with either agent alone, was surprisingly observed 3 to 5 days after treatment.

As shown in the above results, it was found that the herbicidal composition has synergistically accelerated herbicidal activity when glyphosate and oxacycin are applied together, compared to when glyphosate is used alone.

Test example 2 (Effect of foliage and soil treatment on various weeds) A certain amount of weed seeds such as cottontail and blueberry were added to the soil surface layer 3Cr.
Mixed seeding to n.

After that, when the crabgrass etc. grew to about 15 crn,
A predetermined amount of each drug was sprayed onto weed leaves using a small sprayer in an amount of 10 ml per vat.

However, before the spraying, the grasshopper, Japanese knotweed, and blueberry were sown again in the pots, and this was used as an indicator of the degree of subsequent emergence after the weeds were killed.

The results of the survey are shown in Table ■.

Discussion As seen in the test results, no plots treated with oxacyacin or glyfuosate showed excellent herbicidal activity against the grass and broad-leaved weeds tested in both the foliage and soil treatment effects.

On the other hand, it has been found that the oxacyacin glyphosate mixture of the present invention not only exhibits an excellent foliage treatment effect when applied to weed foliage, but also exhibits excellent soil treatment efficacy against subsequent weeds. It was.

From the above results, the oxacyacin + glyfuosate mixture is a powerful herbicide that compensates for the effects that could not be expected depending on the treatment time when used as a single agent, and shows an extremely excellent comprehensive weed control effect when treated with foliage twice. It turned out to be a composition.

Test Example 3 (Root absorption chemical damage test for various crops) Fresh seedlings of grapes, grapes, pears, chestnuts, mandarin oranges, etc., were each transplanted. Thereafter, a predetermined amount of each chemical was sprayed onto the soil surface using a power sprayer per pot.

Investigations were conducted 2 and 6 months after treatment. The results of the survey are shown in Table ■.

However, the amount of treatment chemicals was 5 times the amount applied.

Discussion As seen in the test results, even if five times the standard application rate of each chemical was used, each crop treated with each treatment area, such as the oxacyacin and glyphosate single treatment area and the oxacycin + glyphosate mixture treatment area, No drug damage was observed at all.

As shown in the above results, the oxacyacin + glyphosate mixture was found to be an extremely safe herbicide composition with no phytotoxicity to crops.

Claims (1)

[Claims] As an active ingredient, 5-tert-butyl-3=(2,4
-dichloro-5-isopropoxyphenyl)-1,3,
4-Oxadiazolin-2-one,! A herbicidal composition containing zN-(phosphooazmethyl)glycine in a polymerization ratio of 8 to 8:1.