JP6148197B2 - Seed germination inhibiting composition - Google Patents

Description

  The present invention relates to a seed germination inhibitor composition. More specifically, the present invention relates to a composition containing pelargonic acid or a salt thereof and a plant-derived essential oil as active ingredients and capable of obtaining a synergistic effect by suppressing seed germination.

  Traditionally, if weed growth is not controlled, weeds will grow, impairing aesthetics, and nutrients in the soil will be absorbed by weeds, resulting in poor growth of plants other than weeds. There have been concerns about adverse effects such as the deterioration of the environment. Various herbicides have been used as one method for controlling these weeds. Formulations containing chemically synthesized herbicidal components typified by urea and carbamates have been used, but the need for herbicides derived from natural ingredients has increased due to the increased safety orientation of users. As herbicides of naturally derived components, fatty acids and salts thereof conventionally represented by pelargonic acid (Patent Publication 2011-1337; Patent Document 1), d-limonene (Patent Publication 2008-53718, Patent Document 2), etc. Has been used.

However, these herbicidal active ingredients derived from natural ingredients have a short weeding period, and weeds can be regenerated in a few days, such as in summer when the grass is high. One of the reasons is that it is difficult to kill the roots at the time of treatment, but germination from seeds already present in the soil before the herbicide treatment is also considered to be a cause.
As a technique for suppressing germination, conventionally, a herbicidal sheet that suppresses germination of a photo-sprouting seed by shading is used. Moreover, there exists a report that the germination inhibitory effect was recognized by the plant essential oil as a chemical treatment method which suppresses germination (Journal of Environmental Biology 28 (1) 63-66 (2007); nonpatent literature 1).

Japanese Patent Publication No. 2011-1337 Japanese Patent Publication No. 2008-53718

Journal of Environmental Biology 28 (1) 63-66 (2007)

  The subject of this invention is providing the composition which has the effect which improves the herbicidal effect of the composition which uses pelargonic acid or its salt as an active ingredient, and suppresses germination of the seed in soil.

  As a result of diligent research to solve the above problems, the present inventors have found that the effect of inhibiting germination of seeds is synergistically increased by mixing plant-derived essential oil with pelargonic acid or a salt thereof, thereby completing the present invention. did.

That is, this invention provides the seed germination inhibitory composition of following 1-4.
1. A seed germination inhibiting composition comprising pelargonic acid or a salt thereof and a plant essential oil.
2. 2. The composition according to item 1 above, wherein the plant essential oil is selected from cinnamon oil, citronella oil, geranium oil, rich oil and cedarwood oil.
3. 2. The composition according to item 1 above, containing 0.1 to 10% by mass of pelargonic acid or a salt thereof.
4). 3. The composition according to item 1 or 2 above, containing 0.0001 to 1% by mass of plant essential oil.

  The composition of the present invention containing pelargonic acid or a salt thereof and a plant essential oil exhibits a remarkable synergistic effect on seed germination inhibition.

The seed germination inhibiting composition of the present invention is described in detail below.
In the seed germination inhibiting composition of the present invention, pelargonic acid or a salt thereof and plant essential oil are used in combination as active ingredients.
Pelargonic acid or a salt thereof is used at a concentration of 0.1 to 10% by weight, preferably 1 to 5%, based on the entire composition. If it is less than 0.1% by mass, the germination inhibiting effect is weak, and if it exceeds 10% by mass, it is not practical in terms of cost.

  Examples of the salt of pelargonic acid include sodium salt, potassium salt, calcium salt, magnesium salt, ethanolamine salt, ammonium salt, etc. These salts are not only used alone but also separately from pelargonic acid and the corresponding base. In addition, salts may be formed in the composition, for example, pelargonic acid and ammonia or sodium hydroxide may be added separately and used as ammonium or sodium salts.

Examples of the plant essential oil used in the seed germination inhibiting composition of the present invention include anise seed oil, immortelle oil, ylang ylang oil, iris oil, elemi oil, allspice oil, olibanum oil, kabosu oil, orange oil, chamomile oil, cayupute Oil, cardamom oil, carbanam oil, carrot seed oil, cinnamon oil, cumin oil, clary sage oil, grapefruit oil, clove oil, black moji oil, moon peach oil, copaipa oil, coriander oil, cypress oil, cypress oil, cedarwood oil, citronella Oil, cinnamon oil, jasmine oil, juniper berry oil, ginger oil, cedar oil, star anise oil, spearmint oil, sage oil, geranium oil, celery seed oil, St. John's wort oil, thyme oil, tagt oil, tarragon oil, tangerine oil , Tuberose oil, tea Lee oil, dill seed oil, nutmeg oil, narde oil, neroli oil, violet leaf oil, pine oil, basil oil, patchouli oil, light load oil, vanilla oil, palmarosa oil, valerian oil, hinoki oil, hiba oil, fennel oil , Petit Grain Oil, Black Pepper Oil, Frangipani Oil, Frankincense Oil, Blue Cypress Oil, Bay Oil, Peppermint Oil, Bergamot Oil, Benzoin Oil, Myrtle Oil, Marjoram Oil, Manuka Oil, Mandarin Oil, Mimosa Oil, Myrrh Oil, Melissa Oil, fir oil, blue yaw oil, coconut oil, eucalyptus oil, lime oil, labandin oil, ravensara oil, lavender oil, ritsukubeba oil, linden oil, lemon oil, lemongrass oil, lemon verbena oil, lemon balm oil, lemon myrtle oil, Alba rose oil, damask rose oil, raw Wood oil, rosemary oil, and the like lovage oil.
Among these, cinnamon oil, citronella oil, geranium oil, melamine oil, and cedarwood oil are preferable in consideration of odor, price, availability, and the like.

  In the present invention, the plant essential oil is used at a concentration of 0.0001 to 1% by mass, preferably 0.05 to 1%, based on the entire composition. If it is less than 0.0001% by mass and more than 1% by mass, a synergistic effect cannot be obtained.

The seed germination inhibiting composition that can produce the germination inhibiting effect by blending the pelargonic acid or its salt and essential oil of the present invention can be produced by a conventional method.
As an example of the production method, the seed germination inhibiting composition of the present invention can be produced by adding pelargonic acid and essential oil to water and stirring.
In addition, a seed germination inhibiting composition that does not need to be diluted at the time of use by preparing a solution (solution A) by dissolving pelargonic acid, essential oil, and a surfactant in a solvent, and mixing and stirring the solution A in an appropriate amount of water. Can be produced as an emulsion.

As the water, tap water, ion-exchanged water, distilled water, filtered water, sterilized water, ground water and the like are used.
As the solvent, for example, a high boiling point solvent having a boiling point of 200 ° C. or higher, preferably 200 ° C. to 500 ° C. can be used. Specifically, triallyldiethane (boiling point 340 to 405 ° C.), phenylxylylethane (boiling point 290 to 305 ° C.), dimethylpropylnaphthalene (boiling point 294 to 290 ° C.), which is preferably used for the purpose of a dissolution aid. 315 ° C.), a mixture of dimethyl succinic acid, dimethyl glutaric acid, and dimethyl adipic acid (boiling point 200-235 ° C .; structural formula H ₃ COOC— (CH ₂ ) n—COOCH ₃ (n = 2 to 4)), N , N-dimethyldecanamide (boiling point 250 ° C.), methylnaphthalene (boiling point 226 to 286 ° C.), and the like.

  In the seed germination inhibiting composition of the present invention, in addition to pelargonic acid or a salt thereof and a plant essential oil, conventional antifreeze agents, antifoaming agents, antiseptics, antioxidants and the like, which are used when preparing herbicides, if desired. A thickener or the like can be added.

  As the surfactant, a nonionic surfactant, an anionic surfactant, a cationic surfactant, and an amphoteric surfactant can be used. Examples of the nonionic surfactant include polyoxyalkylene allyl phenyl ether, polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, polyoxyethylene allyl phenyl ether, polyoxyethylene styryl phenyl ether, and polyoxyethylene alkylphenyl. Ether formaldehyde condensate, polyoxyethylene-polyoxypropylene block polymer, polyoxyethylene-polyoxypropylene block polymer alkylphenyl ether, sorbitan fatty acid ester (eg, sorbitan monooleate, sorbitan laurate), polyoxyethylene fatty acid ester, poly Oxyethylene sorbitan fatty acid ester, polyoxyethylene caster oil ether, polyethylene group Call fatty esters, polyethylene glycol fatty acid ester. Examples of the anionic surfactant include alkyl sulfate, polyoxyethylene alkyl ether sulfate, polyoxyethylene alkyl phenyl ether sulfate, polyoxyethylene benzyl (or styryl) phenyl ether sulfate, and polyoxyethylene-polyoxypropylene block polymer. Sodium, calcium or ammonium salts of sulfuric acid; alkyl sulfonates, dialkyl sulfosuccinates, alkylbenzene sulfonic acids (eg, calcium dodecylbenzene sulfonate), mono- or di-alkyl naphthalene sulfonic acids, naphthalene sulfonic acid formaldehyde condensation , Lignin sulfonic acid, polyoxyethylene alkyl phenyl ether sulfonic acid or polyoxyethylene alkyl ether sulfosuccinate Sodium, calcium, ammonium or alkanolamine salts of polyoxyethylene alkyl ether phosphate, polyoxyethylene, mono- or di-alkyl phenyl ether phosphate, polyoxyethylene benzyl (or styryl) phenyl ether phosphate, polyoxyethylene Examples include salts such as sodium or calcium salts of benzyl (or styryl) phenyl ether phosphate or polyoxyethylene-polyoxypropylene block polymer phosphate. Examples of the cationic surfactant include quaternary ammonium salts, alkylamine salts, alkylpyridinium salts, and alkyl oxides. Examples of amphoteric surfactants include alkyl betaines and amine oxides.

  Examples of the antifreezing agent include ethanol, ethylene glycol, propylene glycol, ethyl cellosolve, butyl carbitol, 3-methyl-methoxybutanol and the like.

  Antifoam E-20 (silicone emulsion, Kao Corporation, trade name), antifoam C (Dow Corning, trade name), antifoam C emulsion (trade name of Dow Corning, Inc.) ), Rhodesill 454 (Rhodia, trade name), Rhodesyl Antifoam 432 (Rhodia, trade name), TSA730 (Toshiba Silicone, trade name), TSA731 (Toshiba Silicone, trade name), TSA732 (Toshiba Silicone, Inc.) ), Silicone-based antifoaming agents such as YMA 6509 (Toshiba Silicone, trade name), and fluorine-based antifoaming agents such as Fluorowet PL80 (Clariant).

  Examples of preservatives include Priventol D2 (chemical name: benzyl alcohol mono (poly) hemiformal), PROXEL GXL (S) (chemical name: 1,2-benzisothiazolin-3-one, 20%), biohope, and the like. Biohope L (chemical name: organic nitrogen sulfur compound, organic bromine compound), Bestside-750 (chemical name: isothiazoline compound, 2.5-6.0%), 5-chloro-2-methyl- 4-isothiazolin-3-one, 2-methyl-4-isothiazolin-3-one, 2-bromo-2-nitropropane-1,3-diol, sodium benzoate, potassium sorbate, sodium dehydroacetate, parachlorometa Examples include xylenol and 2,6-dimethylphenol.

  As the antioxidant, tetrakis [methylene-3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate] methane (Tominox TT, API Corporation, trade name / IRGANOX1010 or IRGANOX1010EDS, Ciba Japan Co., Ltd., trade name), butylated hydroxytoluene (BHT), butylated hydroxy anisole (BHA), propyl gallate, and vitamin E, mixed tocopherol, α-tocopherol, ethoxyquin, ascorbic acid, etc. It is done.

  Examples of the thickener include PVP K-15 (chemical name: polyvinylpyrrolidone), xanthan gum, polyvinyl alcohol, guar gum, carboxyvinyl polymer, and the like.

Next, the present invention will be described more specifically with reference to examples, comparative examples, and test examples. However, the present invention is not limited to these examples. Unless otherwise specified, “parts” in the following examples represent “parts by mass” and “%” represents “% by mass”.
The components used in the formulations of Examples and Comparative Examples are as follows.

1) Pelargonic acid nonanoic acid: manufactured by Inoue Fragrance Co., Ltd.
2) Plant-derived essential oil (1) Cinnamon oil: Cinnamon leaf (trade name, Living Wooden Co., Ltd.)
(2) Citronella oil: Citronella (trade name, Living Wooden Co., Ltd.),
(3) Cedarwood oil: Cedarwood Atlas (trade name, Living Wooden Co., Ltd.),
(4) Hojo Oil: Hoafei (trade name, Living Wooden Co., Ltd.)
(5) Geranium oil: Geranium (trade name, Living Wooden Co., Ltd.).

3) pH adjuster 25% ammonia water (manufactured by Kobayashi Co., Ltd.).

4) Solvent Ion exchange water.
5) Control chemical herbicide Cremate emulsion (active ingredient: butamifos) (manufactured by Sumitomo Chemical Co., Ltd.)

Examples 1-33:
Nonanoic acid and each essential oil were mixed at the blending ratios (prescriptions) shown in Tables 1 to 3, and 75 parts of water was added and emulsified with an ultrasonic emulsifier. While stirring it, an appropriate amount of 25% aqueous ammonia was added to adjust the pH to dissolve nonanoic acid. In this example, the final composition pH was adjusted to about 9 as a guide. Water was added so that the total mass part was finally 100, and after stirring, the composition described in the examples was obtained. In Tables 1 to 3, “*” of 25% aqueous ammonia means that an appropriate amount of the final preparation was added so that the pH was about 9.0 ± 0.2. In addition, Example 33 is an emulsified composition that does not adjust the pH with aqueous ammonia, and after all the raw materials were added, it was emulsified with an ultrasonic emulsifier and immediately subjected to a test.

Comparative Examples 1-29:
Compositions of Comparative Examples 1, 22 to 26 and 28 were prepared in the same manner as in Examples 1 to 32 with the blending ratios (formulations) shown in Tables 4 to 6. “*” In 25% ammonia water in Tables 4 to 6 means that an appropriate amount of the final composition was added so that the pH was about 9.0 ± 0.2, as in the examples.
Comparative Examples 2-21 and 27 were prepared in the same manner as Example 33. In Comparative Example 29, all the raw materials were added, and then stirred with a magnetic stirrer and used for the test.

なお、本発明中の発芽抑制効果における実測値は５反復試験の平均値から補正発芽抑制率を算出し、理論値は単成分の比較例試験結果よりコルビーの計算式で算出した理論補正発芽抑制率である。また理論値よりも実測値が高い場合は相乗効果が認められると判断した。 Test example 1:
Each composition of Examples 1-5 and Comparative Examples 1-6 and 29 was put into a 420 mL capacity resin container, and a mist spray spray trigger was attached. 100 seeds of white clover were sown in a No. 5 plastic pot containing soil, and about 20 mL of each composition was treated 5 hours after irrigation to confirm the germination inhibitory effect of various essential oils. The number of germination was measured 20 days after the treatment, the corrected germination inhibition rate was calculated, and the results are shown in Table 7.
The corrected germination inhibition rate is a numerical value obtained from the following formula from the untreated germination rate (A (%)) and the treated germination rate (B (%)).

In addition, the actual value in the germination inhibitory effect in the present invention is calculated from the average value of five repeated tests, and the corrected germination inhibition rate is calculated. Rate. Moreover, it was judged that a synergistic effect was recognized when the measured value was higher than the theoretical value.

The theoretically corrected germination inhibition rate when two components of Colby are mixed can be obtained by the following formula from the corrected germination inhibition rate (Xc) when pelargonic acid alone and the corrected germination inhibition rate (Xd) when plant essential oil is alone.

  From the results shown in Table 7, a synergistic effect of inhibiting germination was observed in the compositions of Examples 1 to 5 in which pelargonic acid and various plant essential oils (Cedarwood Atlas, Cinnamon Leaf, Citronella, Horef (Yellow), Geranium) were mixed. It was.

Test example 2:
The same test as in Test Example 1 was carried out with the compositions of Examples 6 to 20, Comparative Examples 1, 7 to 21, and 29, and the results of examining the correlation between the essential oil concentration and the germination inhibitory effect in Citronella and cinnamon leaf Shown in 8 and 9.

  From the results of Tables 8 and 9, a synergistic effect was observed in germination inhibition in the test plots having a plant essential oil concentration of 0.0001% to 1%.

Test Example 3:
Table 10 shows the examination results of the correlation between the pelargonic acid concentration and the germination inhibitory effect when the same tests as in Test Examples 1 and 2 were carried out with the compositions of Examples 21 to 32 and Comparative Examples 1, 8, 13, 22, 26 and 29. And 11.

  From the results of Tables 10 and 11, a synergistic effect of inhibiting germination was observed in the test group in which the concentration of pelargonic acid was 0.1% to 10%.

Test Example 4:
Table 12 shows the results of tests similar to those of Test Examples 1 to 3 performed in Examples 29 and 33 and Comparative Examples 1, 13, and 27 to 28 and confirming the influence of the presence or absence of ammonia.

  From the results of Table 12, in Test Example 4, a synergistic effect was also observed for the emulsified composition of Example 33 (pH 3.75) that was not adjusted to pH 9.0 ± 0.2 with aqueous ammonia, and the pH of the composition was It was confirmed that the germination inhibitory effect was not affected.

  The composition containing pelargonic acid or a salt thereof and a plant essential oil according to the present invention and synergistically enhancing the seed germination inhibitory effect is useful in herbicidal scenes, especially for home gardening where users are increasingly interested in safety.

Claims (1)

Seed germination inhibiting composition containing 0.1 to 10% by mass of pelargonic acid or a salt thereof and 0.0001 to 1% by mass of a plant essential oil selected from cinnamon oil, citronella oil, geranium oil, aromatic oil and cedarwood oil .