JP2002226303A - Mulch/herbicidal composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a composition comprising a mulch and a herbicide useful for controlling weeds. SOLUTION: This composition comprises (a) a herbicidally effective amount of a compound represented by the formula (wherein, R is a 1-7C alkyl, a 2-7C alkenyl, a 2-7C alkynyl, a 3-7C cycloalkyl, a haloalkyl or a 3-6C cycloalkanylalkyl; R1 and R2 are each independently a 1-3C alkyl, a fluorinated methyl or chlorofluorinated methyl, with the proviso that at least one of R1 and R2 is the fluorinated methyl or chlorofluorinated methyl; and R3 and R4 are each independently a 1-3C alkyl and mixed on a carrier and (b) an organic or an inorganic mulch.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

FIELD OF THE INVENTION The present invention relates to compositions comprising mulch and herbicides useful for weed control.

[0002]

BACKGROUND OF THE INVENTION Mulch is a ground-covered mulch that conserves moisture in the soil and inhibits weed growth. Mulch offers many benefits to growers. They help prevent soil erosion and runoff from severe rain.
Moisture in the soil is preserved because evaporation is reduced. In addition, mulch stops weed growth (choke o
ut) or by inhibiting weed seeds from contacting the soil. The layer of mulch on the soil also acts as an insulator by keeping the summer soil cool and eliminating the risk of freeze-thaw cycles on winter plants. While doing its job of keeping moisture in the soil and inhibiting weed growth, the mulch also creates a rich, uniform background for plants, shrubs and trees. When organic mulch decomposes, it becomes a valuable addition to soil structure.

[0003] Pine nugget (pine nugget)
Many different materials have been used as mulch including s), pine needles, shredded hardwood bark, chipped hardwood, sawdust, ground rubber and plastic mat. Was. Mulch is commonly grown annually and perennial (annual and perennia).
Used in new and existing ornamental plant floors to protect and beautify both l plants. They are often used in recreation areas around swing sets and climbing bars. Mulch offers several advantages in these areas. Mulch can retain soil moisture, protect young plants, control weeds, inhibit mud and erosion, add nutrients to the soil as the mulch degrades, and add color and texture to the garden. it can. However, one of the biggest drawbacks of mulch is incomplete weed control. Weeds such as nutsedges and thistles can grow through even thick mulch. Multi is disturbed (d
isurbed) or if not applied uniformly
Numerous weeds can grow through the mulch.

Since mulch does not completely control weeds,
To ensure a weed-free area, additional weed control measures must usually be used. A standard additional weed control measure is to apply one or more herbicides to the area. These applications can take place before, simultaneously with or after the mulch itself is spread. If additional application is required, growers incur additional costs. Thus, if a combination of mulch and herbicide could be used, cost savings and increased efficiency would be obtained. Such combinations are known. Multiply herbicide, especially multi-layered film (mu)
Attempts to add to these are well known. Unfortunately, adding herbicides to wood mulch has been problematic due to both herbicide and mulch properties. Most pre-emergent herbicides are from a group of compounds called dinitroanilines. These compounds (pendimetaline (pendim)
ethalin), prodiamine (Prodiamin)
e) and Oryzalin)
Is yellow in color and, when added to the mulch, gives it an unacceptable yellow color. Furthermore, these substances have a strong affinity for organic substances. As a result, they may bind to the mulch and may not release to control weeds. However,
We have found a mulch / herbicide combination that gives significantly better weed control than expected on the basis of weed control obtained using mulch and herbicide separately.

[0005]

SUMMARY OF THE INVENTION U.S. Pat. No. 4,692,92.
No. 184 discloses a class of pyridine dicarboxylic acid herbicides useful for weed control under various conditions. They can be pre-emergence or after early emergence (e
It is particularly effective for controlling weeds in early post-emergence. We have found that when these herbicides are mixed with the mulch before spreading the mulch, the mulch gives unexpectedly high herbicidal activity and lower application rates than would be expected from separate use of the mulch and herbicide. And found to be effective in controlling various weeds. In the present invention, a herbicide is first mixed with a carrier (incorporati
ng), and then blending the carrier into the mulch solves the problem of herbicide binding to the mulch. The herbicides of the present invention are a unique choice for this use. Because they are transparent white compounds unlike dinitroanilines and do not cause coloration. This leaves the mulch in its natural color.
By incorporating the herbicide on the clay carrier and then blending into the mulch, the small clay particles can freely filter into the ground, where the herbicide is released at the site of most effective action.

One aspect of the present invention is to provide a) a herbicidally effective amount of a compound of formula (I)

[0007]

Embedded image

Wherein R is (C ₁ -C ₇ ) alkyl, (C ₂
-C ₇₎ alkenyl, (C ₂ ~C ₇₎ alkynyl, (C ₃ ~
C ₇₎ cycloalkyl, haloalkyl, or (C ₃ ~
C ₆ ) cycloalkanylalkyl, wherein R ¹ and R ² are independently (C ₁ -C ₃ ) alkyl, fluorinated methyl or chlorofluorinated methyl, provided that at least one of R ¹ and R ² is
One is fluorinated methyl or chlorofluorinated methyl, and R ³ and R ⁴ are independently (C ₁ -C ₃ ) alkyl;
(b) an organic or inorganic mulch.

In a second aspect of the invention, there is provided a) a herbicidally effective amount of a compound of formula (I)

[0010]

Embedded image

Wherein R is (C ₁ -C ₇ ) alkyl, (C ₂
-C ₇₎ alkenyl, (C ₂ ~C ₇₎ alkynyl, (C ₃ ~
C ₇₎ cycloalkyl, haloalkyl, or (C ₃ ~
C ₆ ) cycloalkanylalkyl, wherein R ¹ and R ² are independently (C ₁ -C ₃ ) alkyl, fluorinated methyl or chlorofluorinated methyl, provided that at least one of R ¹ and R ² is
One is fluorinated methyl or chlorofluorinated methyl, and R ³ and R ⁴ are independently (C ₁ -C ₃ ) alkyl; ) An organic or inorganic mulch, wherein the composition comprises a locus of the weed.
A method for controlling weeds comprising applying to s) is provided.

The term "alkyl" refers to one to
Linear or branched alkyl groups having 7 carbon atoms, such as methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl and t
means tert-butyl.

The term "alkenyl" refers to 2
A linear or branched alkenyl group having from 7 to 7 carbon atoms, for example, ethenyl, 2-propenyl, 2-butenyl, 1-methylethenyl, 2-methyl-2-propenyl and the like.

The term "alkynyl" has two radicals per radical.
A linear or branched alkynyl group having up to 6 carbons, such as ethynyl, 2-propynyl, 2-butynyl and the like.

The term "cycloalkanyl" refers to an alkyl group substituted by a (C ₃ ~C ₆₎ cycloalkyl group.

The term "fluorinated methyl"
It means a methyl group in which 1 to 3 of the hydrogens of the methyl group have been replaced by fluorine. The term "chlorofluorinated methyl" refers to a methyl group in which at least one hydrogen has been replaced by fluorine and at least one hydrogen has been replaced by chlorine.

"Halo" means chloro, fluoro, bromo and iodo.

The term "location" means all areas where weeds are or are likely to grow and where the use of mulch is desired.

Preferably, R is (C ₁ -C ₇ ) alkyl. More preferably, R is 2-methylpropyl. Preferably R ¹ and R ² are independently methyl, fluorinated methyl or chlorofluorinated methyl. More preferably, R ¹ and R ² are independently fluorinated methyl or chlorofluorinated methyl. Most preferably, ^one of R ¹ and R ² is difluoromethyl and the other of R ¹ and R ² is trifluoromethyl. Preferably, R ³ and R ⁴ are independently (C ₁ -C ₃ ) alkyl. Most preferably, R
³ and R ⁴ are both methyl.

Most preferably, the herbicide is a substance commonly called dithiopyr,
2-difluoromethyl-4- (2-methylpropyl)-
6-trifluoromethyl-3,5-pyridine dicarbothioic acid S, S-dimethyl ester.

The term "mulch", in its broadest sense, means any material spread on the ground that retains moisture in the soil and inhibits weed growth. The mulch is made of an organic material such as a pine straw (p
ine straw), shredde
d) pine, shredded hardwood, shredded licorice root, shredded wood waste, shredded cedar (ce)
dar), cedar chips, pine bark, pine nuggets, pine needles, chopped wood and bark, chipped wood and bark, sawdust, crushed rubber, mowed grass
clippings, leaves, straw, hay, compost, newsprint, crushed plastic, plastic sheets and landscaping fabrics
bric) and inorganic materials, such as stone and marble chips or combinations thereof.

As used herein, all percentages are weight percentages unless otherwise specified, and are—inclusive and combinable. All ratios are by weight and all ratio ranges are inclusive and combinable. All molar ranges are inclusive and combinable.

The process according to the invention may optionally comprise other compounds having further biological activity, for example additional herbicidally active compounds or fungicidal activites.
iv.) or insecticide activity (insectici)
dal activity) to the site of the weed.

The method of the present invention can be used in a number of locations, including agricultural crops, horticultural crops, decorative crops, and flower beds.
s) and is useful for controlling weeds in areas surrounding structures, sidewalks and roadways.

The herbicides of the present invention are incorporated onto the carrier using any conventional method that results in the distribution of the herbicide on the surface of the solid carrier, inside the carrier, or both. Such incorporation includes: a) dissolving the herbicide in a solvent, blending the dissolved herbicide with the carrier and removing the solvent, b) melting the herbicide, blending the molten herbicide with the carrier, and This can be accomplished in a variety of ways, including cooling the blend, c) physically blending the solid herbicide with the carrier, and d) similar methods known to those skilled in the compounding art.

The term "carrier" can be used to dissolve, disperse, or diffuse a herbicide in a composition without compromising the effectiveness of the herbicide, and as such
Means one or more solid diluents that do not significantly adversely affect the soil, equipment, desired plant or agricultural environment. Carriers include, for example, crushed natural minerals, such as kaolin, clay, talc, chalk, quartz, attapulgite, montmorillonite, calcite, marble, pumice, sepiolite, dolomite, and diatomaceous earth; crushed synthetic minerals, such as Highly dispersed silicic acid, alumina and silicates; synthetic granules of inorganic and organic meals (s)
synthetic granules of organic material, such as sawdust, coconut shells, corn cobs and tobacco stalks; and synthetic polymeric materials. Preferably, the carrier is a clay.

[0027] In addition to the herbicides and carriers, the compositions of the present invention can also contain inert ingredients. Such ingredients include surfactants, dispersants, spreaders, stickers, defoamers, emulsifiers and all MC Publishing Company (N
ew Jersey, USA) McCutcheon
Annual McCutcheo by Division
n's Emulsifiers and Deter
gents, McCutcheon's Emulsi
fiers and Detergents / Func
temporal Materials and McCutc
heon's Functional Material
ls, as well as other similar materials. The inert ingredient can be added to the composition at the same time that the herbicide is impregnated on the carrier, or in a separate impregnation step before or after the impregnation, or before the herbicide is impregnated on the carrier. Can be added to the composition in multiple impregnation steps that take place simultaneously with and / or after the impregnation. The invention also encompasses compositions comprising one or more additional pesticides and / or one or more fertilizers. The fertilizer can function as a carrier, can be impregnated on the carrier,
Or they can be added separately to the mulch.

The herbicide can be incorporated on the carrier at a concentration of up to 5% by weight. Preferably, the herbicide is 0.00
It can be mixed at a concentration of 1 to 1% by weight, more preferably 0.001 to 0.01% by weight. The amount of herbicide impregnated in the mulch-blended carrier will vary depending on the type of mulch material and the desired depth of the mulch. The mulch can be extended to the area to be processed at any depth that is typically used for standard multiplexing. This can be up to 15 cm.
However, more typically, the mulch is 5-10 cm
Spread to the depth of. Based on the desired depth of the multi
The amount of herbicide incorporated into the carrier should be in the range 100-1000 g / ha, preferably 200-600 g / ha, most preferably 400-500 g / ha.

The following examples illustrate many aspects of the present invention.

In the following examples, dithiopeel was added to 1
2-18% by weight is first dissolved in a warmed solvent such as dipropylene glycol. This solution was then sprayed onto the clay carrier. The clay carrier is then blended with the mulch to give a dithiopeel of 370-5 when applied on the ground.
It had an application rate of 60 grams / ha.

The results obtained with the composition of the present invention were compared with the results obtained using herbicides and mulch individually.

[0032]

[Table 1]

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Sanford Earl Simon 35150 Sylacauga South Norton Avenue, Alabama 219 F term (reference) 4H011 AB01 BB09 BC19 DA12 DD04 DE17 DH01 DH09

Claims (6)

[Claims] 1. A) a herbicidally effective amount of a formula Wherein R is (C ₁ -C ₇ ) alkyl, (C ₂ -C ₇ ) alkenyl,
(C ₂ -C ₇ ) alkynyl, (C ₃ -C ₇ ) cycloalkyl, haloalkyl, or (C ₃ -C ₆ ) cycloalkanylalkyl, wherein R ¹ and R ² are independently (C ₁ -C ₃₎ ) Alkyl, fluorinated methyl or chlorofluorinated methyl, provided that at least one of R ¹ and R ² is fluorinated methyl or chlorofluorinated methyl, and R ³ and R ⁴ are independently (C ₁
-C ₃₎ alkyl, in shown, the compounds are mixed on a carrier, and b) an organic or inorganic multi, comprising the composition. 2. The composition according to claim 1, wherein the carrier is a clay. 3. The mulch comprises pine straws, shredded pine, shredded hardwood, shredded licorice root, shredded wood waste, shredded cedar material, cedar chips, Pine bark, pine nuggets, pine needles, shredded wood and bark, chipped wood or bark, sawdust,
Ground rubber, mowed grass, leaves, straw, hay, compost, newsprint, ground plastic, plastic sheets,
3. The composition according to claim 1 or 2, wherein the composition is selected from one or more of landscaping cloth, stone and marble chips. Wherein R is (C ₁ ~C ₇₎ alkyl, R ¹
And R ² are independently methyl, fluorinated methyl or chlorofluorinated methyl, and R ³ and R ⁴ are independently (C ₁
-C ₃₎ The composition according to any one of claims 1 to 3 alkyl. 5. The method according to claim 1, wherein the herbicide is dithiopeel.
5. The composition according to any one of the above items 4. 6. A method for controlling weeds, comprising applying the composition according to any one of claims 1 to 5 to a place of weeds.