JPH0222208A - Herbicide composition - Google Patents

Abstract

PURPOSE:To obtain a herbicide composition having enlarged suitable period of application and continuing high herbicidal effects without damaging safety and selectivity for rice plant by using both a specific pyrimidine derivative and a chloroacetanilidebased herbicide. CONSTITUTION:(A) A compound shown by formula I (Q is group shown by formula II-formula IV; R1, R2 and R4 are lower alkyl, lower alkoxy and further R4 is H, halogen, lower alkylthio, mono-di-lower alkylamino; R3 is lower alkyl, halogen or halogensubstituted lower alkyl) or a salt thereof is blended with (B) a chloroacetanilide-based herbicide in the ratio of about 0.01-5 pts.wt., preferably about 0.02-2 pts.wt. component A based on 1 pt.wt. component B to give a herbicide composition which has excellently herbicidal action on any weeds before or after germination, has no phytotoxicity to rice plant, etc., requires no following weeding operation by one application and is capable of substantially controlling growth of all weeds.

Description

[Detailed description of the invention] (b) Industrial application fields The present invention relates to a herbicide useful in the field of agriculture and horticulture.

(b) Problems to be solved by the prior art and the invention Generally, in areas where herbicides are applied, many types of weeds grow together, and the budding and growth periods of each individual vary depending on the surrounding environment. It depends on the conditions and is not negative. In particular, with recent water-loaded cultures, the transplanting period has been moved earlier.
The period of weed growth is becoming longer. Therefore, herbicides are applied to many types of weeds at different growth stages, and in actual situations, it is quite difficult to kill all weeds with one application. For this reason, the same or different herbicides are used repeatedly several times, but repeated use of such herbicides requires a great deal of labor and causes undesirable problems such as phytotoxicity of paddy rice and residue in the soil due to large amounts of application. is being raised.

Therefore, there is an urgent need for a safe herbicide that has a wide herbicide spectrum, is effective against weeds that have advanced in growth even before they emerge, can maintain its suppressive effect for a specified period of time, and does not harm crops. .

(c) Means for solving the problem In order to solve the above problem, the present inventors (etc.) aimed to completely control all weeds with one application, and to achieve a high degree of safety for the main crop. We conducted extensive research to find a herbicide with the same properties. As a result, by combining the compound represented by the general formula (1) below with a chloroacetanilide herbicide, these problems can be improved and an excellent herbicide can be obtained, which could not be expected if each was applied alone. It was found that the inhibitory effect is long-lasting, and that the growth of virtually all weeds can be suppressed with a single application, especially in flooded fields, and the inhibitory effect lasts so long that no weeding work is required before or after. After further research, they completed the present invention.

The present invention relates to a herbicidal composition characterized by:

Examples of chloroacetanilide herbicides include 2-chloro-2',6-ethyl-N-(n-propoxyethyl)acetanilide (hereinafter abbreviated as compound A),
-Chlor-2',6'-diethyl-N-(n-butoxymethyl)acetanilide (hereinafter abbreviated as compound B)
, 2-chloro-2', 6°-dimethyl-N-[(3-methoxythiophen-2-yl)methyl]acetanilide (hereinafter abbreviated as compound C), and the like.

Representative examples of the compound represented by the general formula (1) include the following. However, although the following compounds are included in the compounds represented by the general formula (1), the compounds represented by the general formula ([) are not limited to these.

That is, the present invention relates to the general formula (wherein, R1 and R3 each represent lower alkyl or lower alkoxy, R3 represents lower alkyl, a halogen atom, or lower alkyl substituted with halogen, and R4 represents hydrogen). atom, lower alkyl, halogen atom, lower alkoxy, lower alkylthio, lower alkylamino, or di-lower alkylamino. To explain in more detail, one of the herbicide compositions of the present invention, a compound represented by the general formula It is a selective herbicide that effectively inhibits rice and is highly safe for rice.However, it may lack the inhibitory effect on wild grasses if the outbreak continues for a long period of time under natural conditions.

On the other hand, conventionally known chloracetanilide herbicides are highly effective against Japanese grasshopper or Japanese grasshopper, Japanese grasshopper, firefly, etc. in the early stages of growth, but are less effective against perennial weeds such as Japanese grasshopper and Japanese cypress. , and when applied to weeds that have advanced in growth, the herbicidal effect decreases.

On the other hand, when both are mixed in an appropriate ratio, the herbicidal spectrum is expanded beyond the range of application obtained with each single agent, and the herbicidal effect is enhanced with less m than when each component is used alone. This effect has been clarified for grass species at different growth stages under natural conditions. In other words, it has been found that the range of appropriate application periods can be expanded while maintaining selectivity without compromising safety against water scavenging, and a high herbicidal effect can be maintained. This shows that it is possible to completely control from annual to perennial weeds by spraying the composition of the present invention after transplanting with water and without any subsequent herbicide treatment, which is economical and labor-saving. Therefore, the usefulness of the present invention is extremely large.

Compositions according to the invention may vary depending on the relative activity of each component.
In general, 1 part by weight of the chloracetanilide herbicide contains 0.01 to 5 parts by weight, preferably about 0.02 to 2 parts by weight of the compound represented by the general formula (2). The appropriate content ratio is about 0.05 to 90% by weight, but as granules, 1['lo, 05 to
10iffff1%, preferably about 0.1 to 5% by weight is suitable.

The appropriate content of the chloracetanilide compound in the preparation is about 0.1 to 90ilrffi%, but as granules it is about 0.2 to 10ilrffi%, preferably about 0
．． 5 to 5iltffi% is suitable.

The appropriate amount of the herbicide composition to be applied varies depending on the application situation, application time, application method, target grass species, cultivated crop species, etc. - Although it cannot be generally specified, a range of about 90.5 to 509 per R is generally appropriate. be.

When applying the herbicidal composition of the present invention, the composition of the present invention is mixed with a suitable solid carrier, for example, a mineral powder such as clay, talc, diatomaceous earth, bentonite, etc., and an emulsifier is added if necessary. It is preferable to add granules, dispersants, stabilizers, etc. to make granules and apply them to water droplets, but it can also be used as emulsions, powders, and wettable powders if necessary. Furthermore, insecticides, fungicides, fertilizers, pigments, fragrances, and the like may be added to the herbicidal composition of the present invention.

(d) Effects of the invention The herbicidal composition of the present invention has excellent herbicidal activity even when treated before or after the emergence of weeds, has no phytotoxic effects on scavenging, and is useful as an excellent selective herbicide. It is. In addition, it is useful as a selective herbicide for various types of grains other than cleaning, and can be applied to control various weeds in other fields, agricultural and horticultural fields such as liangshuhui, and non-agricultural lands. It has a large economic effect.

(e) Examples Next, the present invention will be specifically explained with reference to formulation examples of the present invention, but the present invention is not limited thereto.

Formulation example! Granule compound No. 5 0.25
ffiff1% compound 8
1.5ffiffi% sodium lignin sulfonate 2ffil't% bentonite 56.25% by weight 1
A granule prepared by adding 12% by weight of water based on the total amount of this mixture to a mixture of 40ffilfi% and kneading and granulating the mixture.

Formulation Example 2 Granule Compound No. 1 0.2
5fold ffi% Compound A
1.50% by weight sodium lignin sulfonate
2% by weight bentonite l-56, 25% by weight clay 4
0% by weight of the mixture, 12% by weight based on the total amount of this mixture
Granules made by adding water and kneading to granulate.

Formulation Example 3 Granule Compound No. 4 0.
2fiffi% compound Δ
2.0% by weight sodium lignin sulfonate
6.0ffffi% bentonite
30% by weight clay
A granule prepared by adding 2fflff1% of water based on the total amount of the mixture to a 61.8% by weight mixture and kneading the mixture for granulation.

Formulation Example 4 Granule Compound N o , 50.
25111ffi% Compound B2, 50% by weight Sodium lignin sulfonate 1% by weight 2% by weight Bentonite 55.2
5% by weight clay
Granules made by adding 12% by weight of water based on the total amount of this mixture to a 40% by weight mixture and kneading to granulate ~1° Formulation Example 5 Granule Compound No, I
Q, 25 heavy fi% compound mouth
2.50% by weight sodium ligninsulfonate 5% by weight bentonite
20% clay
A granule prepared by adding 12% by weight of water based on the total amount of the mixture to a 62.75% by weight mixture and kneading the mixture for granulation.

Formulation Example 6 Granule Compound N o , 4
0.2 fold ffi% compound 8
3.0% by weight sodium lignin sulfonate
6.0% by weight bentonite
30% by weight clay
A granule prepared by adding 12 layers of water to a 60.8% by weight mixture and kneading the mixture to make granules.

Product l1i11 Example 7 Granule Compound No. I Q
, 25% by weight Compound CD, 75% by weight Sodium ligninsulfonate 5% by weight Bentonite 3
011 [ff11% clay
A granule prepared by adding 12% by weight of water based on the total amount of the mixture to a 64% by weight mixture and kneading the mixture for granulation.

Formulation Example 8 Granule Compound No. 5 0.25
wt% compound CG, 75wt% sodium ligninsulfonate 5wt% bentonite 3o
ffiffi% clay
64% by weight of the mixture and 12 Tfi! based on the total amount of this mixture! Granules made by adding 1% water and kneading them together.

Formulation Example 9 Granule Compound N o , 10
．． 25ffiffi% Compound A
2% by weight sodium ligninsulfonate 5% by weight bentonite
30% by weight clay
A granule prepared by adding 12iI [ffi% of water based on the total amount of the mixture to a 62.75% by weight mixture and kneading the mixture to make granules.

Formulation Example 10 Granule Compound N o , 50
．． 25% by weight Compound A
2% by weight sodium ligninsulfonate
5% by weight bentonite
30ffi amount% talc
A granule prepared by adding 12% by weight of water based on the total amount of the mixture to a 62.75% by weight mixture and kneading the mixture for granulation.

Formulation example! 1 Granule Compound No. 1 0.
3x Q% Compound A
2% by weight sodium ligninsulfonate
3% by weight bentonite
15% clay
A granule prepared by adding 12ffi% of water based on the total amount of the mixture to a 79.7% by weight mixture and kneading the mixture to make granules.

Test Example 1: Herbicidal effect by pot, phytotoxicity test 1/10,
Fill paddy soil in a 000 Ahl Wagner pot, sow seeds of Japanese cypress, Japanese cypress, and broadleaf (Azaena and Kikashigusa) seeds, and after cultivating them for about a week, raise 2 paddy rice (product N: Nihonsho) KI seedlings.
Transplant the stock. In another pot, sow seeds of Japanese grasshopper and Japanese firefly, and in still other pots, paddy soil containing overwintering stems of Pinus spp. Both pots are flooded with water at 3c.
After water transfer t+111a (first leaf stage of Japanese millet), a predetermined amount of the drug granulated in the same manner as in Formulation Example 1°2.5, 7.8 is applied to each pot.

In addition, in the formulation of Formulation Example 2 above, Compound A or Compounds No. and I were each replaced with clay, and the other preparations were manufactured in exactly the same manner as in the same Formulation Example, respectively, and Comparative Example 1. 3, and the above formulation example! In the formulation of Compound A or Compound No.
Comparative Examples 2 and 3 were prepared in exactly the same manner as the same formulation example, and Comparative Examples 2 and 3 were prepared by replacing Compound No. 5 with clay.
, 1 was replaced with clay, and other preparations were manufactured in exactly the same manner as the same formulation example as Comparative Examples A and 5, respectively, and in the formulation of the above formulation example 7, compound C or compound No.
Comparative Examples 6 and 8 are formulations produced in exactly the same manner as the same formulation example except that I is replaced with clay.
Comparative Examples 7 and 8 were prepared in exactly the same manner as in the same preparation example, except that clay was used for each of Comparative Examples 7 and 1, respectively.

Three weeks after the chemical treatment, the herbicidal effects and chemical damage on various weeds were investigated according to the following criteria.

Show your results! Shown below.

Judgment criteria for weeding effectiveness: Suppression rate (%) 0 0 ~ 51
6-252 2
6-5051-75 76-90 91A-100 Table 1 Greenhouse Wagner pot test chemical damage criterion index Suppression rate (%) 00-5 16-15 21-25 3-26-50 451-75 576-100 However, The above-mentioned suppression rate (%) was calculated by measuring the immediate dry m weight on the ground in the chemically treated area and the non-treated area, and using the following formula.

Table 1 Wagner pot test in a greenhouse (continued) Surface fA Indoor Wagner pot test (continued) Test example 2: Concrete pot test outdoors A 60 x 60c+e concrete pot set up outdoors was filled with paddy soil, soaked in water, and plowed. As a post-paddy field condition, a certain amount of soil containing 25 seeds of Japanese millet, 25 seeds of Japanese bulrush, annual weed seeds, and overwintering stems of Pinus vulgaris was sown and mixed into the soil surface layer. In addition, for Urikawa and Mizugayatsu, 5 sprouted tubers were planted per pot, and 4 plants each were transplanted to a depth of 2 cm with 3 individuals of 2-leaf rice seedlings (product FlI: Nippon Sho) and then flooded. It was set to 5 cm. 13 days after rice transplantation, each granule and formulation example 9 shown in Table 2 among the formulation examples and comparative examples described in Test Example 1 were applied to the 2m stage of Japanese millet. A predetermined amount of the drug, which had been granulated in the same manner as Plate 0, was applied to the pot.

In the formulation of Formulation Example 9 above, Compound A or Compound No.
Comparative Examples 9 and 11 were prepared in exactly the same manner as in the same formulation example except that 1 was replaced with clay, and in the formulation of the above formulation example IO, compound A or compound N
Comparative Examples 10 and 11 were prepared in the same manner as in the same formulation except that o and 5 were replaced with clay.

Note that water continued to leak at a rate of 1.5 ca/day for 3 days after the chemical treatment. During that time, the water level was maintained at 5 cm.

The test was repeated twice, and 5 weeks after the chemical treatment, the herbicidal effects and chemical damage on various weeds were evaluated using the same criteria as Test Example 1. i
T, ta.

The results are shown in Table 2.

(Margin below) Table 2 outdoor concrete pot test

Claims (1)

[Claims] 1. (1) General formula ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼ [In the formula, Q is ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼, ▲ Numerical formulas, chemical formulas,
There are tables, etc. ▼ or ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼, R_1 and R_2 are lower alkyl or lower alkoxy, respectively, R_3 is lower alkyl, halogen atom, or lower alkyl substituted with halogen, R_4 teeth,
Represents a hydrogen atom, lower alkyl, halogen atom, lower alkoxy, lower alkylthio, lower alkylamino or di-lower alkylamino. ] A herbicidal composition characterized by containing a compound represented by these or a salt thereof, and (2) a chloroacetanilide herbicide.