JPH017A - Wheat-acting herbicide - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to wheat acting herbicides. For more details, see 2.
- (2-(4-(3,5-dichloropyridin-2-yloxy)phenoxy)propionyl)isoxazolidine (This compound exists in 4-, steric, or racemic forms, but unless otherwise specified, Hereinafter referred to as "Compound A"
) and 2゜4-dinitro-6-secondary-butylphenyl acetate (hereinafter referred to as "compound B").
The present invention relates to a wheat-acting herbicide characterized in that it contains a seed mixture as an active ingredient.

Therefore, the present invention can be effectively used in the agricultural chemical manufacturing industry and the farm English field.

Compound A, which is the active ingredient of the present invention, is disclosed in JP-A-59-55.
It is known as a herbicide in Japanese Patent No. 882. This compound A
In both soil treatment and growing season treatment, it has an excellent herbicidal effect on grass weeds such as crab grass, field weed, green grass, and hackberry, and it is effective against broad-leaved crops such as soybean, beet, radish, and cotton. However, it causes almost no phytotoxic damage to wheat, and is effective against annual broad-leaved weeds such as chickweed, dogweed, whiteweed, Japanese knotweed, fieldweed, nightshade, and dayflower, and perennial weeds such as staghorn grass and horsetail. However, there is a drawback that the herbicidal effect is extremely poor even when treated during either the germination period or the growth period of these weeds.

Compound B, one of the active ingredients, is found in pages 321 to 322 of the "Pesticide Handbook 1985 Edition" (Published January 30, 1986 by Japan Plant Protection Association).
Page, “Short Review of Barbicide 19
118th edition of the 1986 edition (published by the National Rural Education FF Association)
It is a known herbicide, such as on page 119. and,
Compound B can be used in areas where beans, corn, wheat, etc. are cultivated.
It is known to be effective against annual weeds such as cypressweed, pigweed, pigweed, and hackberry. However, there are the advanced-growing dayflowers, the perennial weeds Ezonogisigigi, horsetail and horsetail. It has the disadvantage that its weeding effect is poor against weeds of the Poaceae family, such as the advanced-growing Sparrow gnome, Psyllium spp.

Among the wheat crops that the invention aims to solve, wheat is often cultivated in the fall, and the types of weeds and
The number of occurrences is small. However, reduced yields due to overgrowth of weeds are a major problem, and when weeds grow, harvesting becomes difficult.

In the case of fall-sown wheat, weed control can be achieved by applying a soil treatment agent before weed emergence and during the weed season, or by applying a soil treatment agent during the weed growth period in autumn (from the 5th leaf stage to the 17th leaf stage of wheat) or the following spring (earling stage). A method of treating the leaves with a foliage treatment agent is used. in this case,
As soil treatment agents, simazine, chloro IPC, etc. are generally used. However, since the period of weed control after treatment is short for all soil treatment agents, it is not possible to completely kill various weeds. Tsuyukusa and the like are appearing frequently. In addition, conventional herbicides are not effective against many weeds, such as the perennial grasshopper, and for this reason, foliar and foliage treatments are often sprayed after soil treatment. is the current situation.

In addition, ioxynil, MCPA, and the like are used as foliage treatment agents. However, all herbicides are significantly less effective at killing weeds such as dayflower and perennial weeds such as Japanese horsetail and horsetail.

Moreover, it does not show any herbicidal effects against various weeds that regularly occur in wheat cultivation areas, such as the grass family weeds, such as grass weeds, grasshoppers, and oats.

In addition, diclofop-methyl is used to target grass weeds during the growing season, but it is less effective against broad-leaved weeds such as chickweed, shepherd's purse, shepherd's weed, dogweed, whiteweed, nightshade, and dayflower, and it also occurs in wheat-growing areas. It is not possible to kill many types of weeds, and there are concerns about chemical damage to wheat. Therefore, special attention must be paid to the method of use.

On the other hand, for spring-sown wheat, the sowing period is relatively low temperature, weeds are slow to emerge, and the soil tends to dry easily, so soil treatment agents are often not effective. In addition to soil treatment agents, foliage treatment herbicides such as MCPA are used. However, MCPA has a poor herbicidal effect on grass weeds and is likely to cause chemical damage to wheat, so care must be taken when using it.

On the other hand, if Compound A and Compound B used in the present invention are used alone, these drawbacks of conventional herbicides cannot be overcome.

Therefore, from the pre-emergence period to the growing season, weeds such as grass weeds such as sycamore and sycamore, as well as broad-leaved weeds such as chickweed, shepherd's purse, japonica, sycamore, and wildflower, as well as difficult-to-weed dayflowers and perennial weeds such as sycamore, japonica, horsetail, etc. It is hoped that a new herbicide will emerge that has sufficient herbicide effects on wheat crops, has no concerns about chemical damage to fall-sown or spring-sown wheat, and is free from toxicity to humans, animals, and fish.

The object of the present invention is to provide a herbicide that meets these needs.

The above pesticide names are based on the above "Pesticide Handbook" or the above "Short Review of Barbicide".
This is the common name listed in .

In view of the current situation, the inventors of the present invention have developed a wide range of methods for solving the problem of grass weeds from before emergence to the growing season. We conducted extensive research in order to develop nine oat-effect removers that are effective against weeds and difficult-to-eradicate plants such as grasshopper, horsetail, horsetail, and dayflower, and are free from drug damage. As a result, it was found that a herbicide containing two types of active ingredients, Compound A and Compound B shown below, met the purpose and was extremely effective.

Compound A 2-(2-(4-(3,5-dichloropyridin-2-yloxy)phenoxy)propionyl)isoxazolidine Compound B 2,4-dinitro-6-secondary-butylphenyl acetate Used in the present invention Compound A and compound B act as active ingredients of the wheat-acting herbicide of the present invention. And this 2
By combining seed ingredients, various weeds in wheat and barley cultivation areas,
For example, it exhibits a high herbicidal effect on grass weeds such as grasshopper, foxtail grass, grasshopper, grasshopper, and oat, and broad-tJ weeds such as chickweed, dogweed, whiteweed, Japanese knotweed, fieldweed, cornflower, and shepherd's purse. Rough note [
The first thing that should be done is to show a high weeding effect on grasshoppers, staghorn grass, horsetail, and dayflower, which are difficult to weed when using Compound A and Compound B alone in soil treatment or foliage treatment. Moreover, its herbicidal effect enhancing action complements and strengthens the weaknesses of Compound A and Compound B without impairing their respective strengths.

The effects tend to be more pronounced when small doses are used together.

It is believed that such effects are due to the synergistic action of the two active ingredients used in combination in the present invention.

Furthermore, when Compound A is used alone, even in small doses, it causes growth-inhibiting phytotoxicity to wheat and barley, but when it is used in combination with Compound B, almost no phytotoxicity phenomenon is observed. Such effects are thought to be due to the antagonistic effects of the two active ingredients of the present invention on wheat, barley, etc.

Examples (method of chemical conversion) The wheat-acting herbicide of the present invention contains two types of active ingredients consisting of compound elA and compound B, along with a carrier and various adjuvants.
It can be formulated into wettable powders, flowables (sols), etc. using conventional methods. The carriers used include clay,
Solid carriers such as talc, bentonite, kaolin, diatom, silica, sucrose, etc., or liquid carriers such as water, alcohols (methanol, ethanol, isopropanol, etc.), glycols (ethylene glycol, propylene glycol, etc.) used. A suitable surfactant or other auxiliary agent 1, such as a stabilizer or a spreading agent, may be added to these in an appropriate amount to prepare a formulation for use.

The compounding ratio of the active ingredients in the present invention is 1 weight ratio, and it is appropriate to mix Compound A in a ratio of 5 to 100 parts of Compound B to IPJ. However, the blending ratio can be changed as appropriate depending on the conditions at the time of application. In addition, other herbicides, fungicides, insecticides, plant regulators, etc. can be mixed and used.

Further, Compound A (4-form, monomorphic, racemic: d-crossover) can be produced by the method described in JP-A-59-55882. and.

Compound A can be effectively used in any of the 4-form, monochrome, and racemic forms, and the 4-form, racemic form is particularly preferred.

Next, examples of the present invention will be shown. In the examples, all parts are by weight.

=- Example 1 (hydrating agent) 5 parts of compound A (racemic form), 50 parts of compound 8, 5 parts of polyoxyethylene alkylaryl ether, 3 parts of calcium lignin sulfonate, and 37 parts of clay were mixed and thoroughly ground. Obtain a hydrating powder.

Example 2 (hydrating agent) Compound A (d form) 2.5 parts, Compound 8 25 parts, boxoxyethylene alkylaryl ether 5 parts, calcium lignin sulfonate 3 parts, and clay 64.5 parts
Mix the parts and thoroughly grind to obtain a wettable powder.

Sodium rukynaphthalene sulfonate tfi, sodium lignin sulfonate 3 parts, xanthan gum 0
．． 3 parts and 68.2 parts 1% of water are mixed uniformly to obtain a floor vine.

Example 4 (Flowable) 2.5 parts of Compound A (d-form), 25 parts of Compound 8, 1 part of sodium alkylnaphthalenesulfonate, 3 parts of sodium ligninsulfonate, 0.3 parts of xanthan gum, and 68.2 parts of water. Mix evenly to get flowable.

The hydrating powders and flowables of Examples 1 to 4 above can be diluted with water and sprayed on the soil surface of a wheat field or on the leaves of weeds in their early stages at a concentration of 5 to 500 g of active ingredient per 10 are. Bye.

Effects of the Invention The wheat-acting herbicide of the present invention provides the following effects when used. That is, by using Compound vsA and Compound B in combination, a unique herbicidal effect that cannot be seen when each is used alone is exhibited, and it exhibits an excellent effect as a herbicide in a standing culture medium for fall sowing and spring sowing.

First of all, weeds of the grass family that have grown from pre-emergence to the 2-leaf stage to the 4-IJ stage (sparrow grass, sycamore, oat, dogweed, silverwort, foxtail grass, etc.) and broad-leaved weeds (chickweed, japonica, japonica, dogweed, Japanese knotweed, etc.) , wildflowers, shepherds, etc.) as well as
It completely kills the difficult-to-kill weeds, such as dayflower, perennial weeds such as Japanese horsetail, horsetail, and grasshopper.

Second, its herbicidal effect is persistent even when treated with soil or foliage, and the reproduction of these weeds can be continuously inhibited.

Thirdly, it does not cause chemical damage to either fall-sown or spring-sown wheat or many of their varieties. This is a significant improvement over other herbicides.

Fourthly, in the wheat-acting herbicide of the present invention, Compound vsA and Compound B complement each other's weaknesses without compromising their respective strengths, and exhibit a high herbicidal effect. What's more, this effect becomes more pronounced when Tan': Iyushun is used. Therefore, in the present invention, by applying a small amount of medicine, it is possible to cause chemical damage to wheat! F. It exhibits a high weeding effect on various grass weeds and broad-leaved weeds, causing them to wither and die.

Therefore, the combined use of Compound A and Compound B in the present invention is useful as a wheat-acting herbicide.

Next, the usefulness of the wheat-acting herbicide of the present invention will be explained using test examples.

Test example 1 Namako L friend'11'≦J'11 mountain MAL limb' (
Narrow - (ヂ, 4 test) Fill a plastic pot with the size of 1/2000 are with field soil (on top of the Okinoki loam), and in this L, put grass wheat, sparrow gnome, oat, Japanese staghorn, dayflower,
Twenty seeds of each type of chickweed weed were sown. and,
These seeds were evenly mixed with the superficial 1 cm of soil, and the surface layer was lightly pressed. In addition, underground stems of horsetail were embedded in lO trees, and seeds of wheat and barley were sown. 6 Miscellaneous 9 is 2-4
Leaf stage, wheat at 3 leaf stage, barley at 3! When reaching the # period, dilute the 7A wettable powder prepared according to Example 1 with water so that the amount of active ingredient applied per 10 are as shown in Table 1! L,, this chemical solution is 20 per lθ are! It was sprayed on the grass blades of weeds at a ratio of L.

This test was conducted using a 3-bot system in 1 section. And drug treatment 3
After 0 days, the surviving weeds are pulled out and the soil is dried i'f<I
(g) was measured, and the average weeding rate (%) for the three plots was determined using the following formula. In addition, for wheat and barley, the ground-E part was cut out, and its dry weight (g) was measured, and the degree of chemical damage to wheat and barley [inhibition rate (2)] was determined according to the method for calculating the removal rate.

The results are shown in Table 1.

The numbers in parentheses in the table indicate the dry ffi (g/pot) of the rest of the untreated plot and of wheat and barley.

Test Example 2 Weeding effect test by soil treatment (pot test) Field soil (alluvial loam) was filled in a plastic bow with a size of 115,000 are, and on top of this, grasshopper,...
20 and 30 weed seeds of sparrow gnome, oat, staghorn, dayflower, and chickweed, respectively;
Sow 30 grains, 20 grains, 20 grains and 20 grains, and
cm of soil and these seeds were uniformly mixed and the surface layer was lightly pressed. Also, other similar items include wheat,
Ten barley seeds were sown at a depth of 2 cm. Then, on the day after sowing, the wettable powder prepared according to Example 2 was diluted with wood to adjust the amount of active ingredient applied per 10 are as shown in Table 2.
The soil surface of each pot was sprayed at a rate of 20 fL per area.

This test was conducted using a system of 3 bots per ward. and.

After 30 days of chemical treatment, the surviving weeds and above-ground parts of wheat and barley were cut off, their dry weight (g) was measured, and the weeding rate (%) and the degree of chemical damage to wheat and barley ( The inhibition rate (%) was calculated.

The results are shown in Table 2.

In addition, the numerical value in parentheses in the table indicates the drying liter (g/pot) of leftover vegetables, wheat, and barley in the untreated area.

Test Example 3 As a test method for herbicidal effect and chemical damage in the field, a test plot with an area of 10 tn' was created,
Per 1 section, wheat barley (5g = weight of seeds; the same applies hereinafter),
I sowed Ezonogisigigi (5g), dayflower (log), and embedded horsetail rhizomes (20 plants), and also wheat,
Each seed of barley was sown. When the weeds reach the 2- to 3-leaf stage, dilute with flowable water prepared according to Example 4 so that the amount of active ingredient applied per 10 are is as shown in Table 3. This chemical solution was sprayed onto the stems and leaves of weeds at a rate of 20 per 10 ares.

This test was conducted in three consecutive sections. After 30 days of chemical treatment, surviving weeds were pulled out within a total of 3 m from three locations in the test area, their dry weight (g) was measured, and the herbicidal rate (%) was determined in the same manner as in Test Example 1. In addition, in the same manner as Test Example 1, the degree of chemical damage to wheat and barley [inhibition rate (%)] was determined.

The results are shown in Table 2.

The numbers in parentheses in Table 1 indicate the dry weight (g/rn') of leftover vegetables, wheat, and barley in the wingless plot.

Test Example 4 Herbicidal effect and chemical damage test in the field A test plot with an area of 1 On'1" was prepared, and per plot, grasshopper (5 g: heavy seedlings - same hereinafter), dayflower (1
In addition, wheat (75 g) and barley (75 g) were sown at the same time.The day after sowing, the flowables prepared according to Example 3 were sown. This test was conducted in triplicate in each plot so that the amount of active ingredient applied per 10 are was as shown in Table 4.Then, 30 days after treatment with the drug, sprays were applied from three locations in the test plot. The surviving weeds and above-ground parts of wheat and barley within a total of 3 m' were cut and their dry weight (g) was measured, and in the same manner as in Test Example 1, weeding - @ (%) and degree of chemical damage to wheat and barley [inhibition rate ( %)] was calculated.

The results are shown in Table 4.

Note that the numbers in parentheses in the table indicate the dry weight (g/rn') of leftover vegetables, wheat, and barley in the untreated group.

Claims (1)

[Scope of Claims] 2-{2-[4-(3,5-dichloropyridin-2-yloxy)phenoxy]propionyl}isoxazolidine and 2,4-dinitro-6-secondary-butylphenyl acetate A wheat-acting herbicide characterized by containing a seed mixture as an active ingredient.