Composition for controlling stone jelly

Abstract

To provide a composition for controlling Nostoc commune that has reduced environmental impact and shows a high controlling effect.SOLUTION: To provide a composition for controlling Nostoc commune that contains grapefruit seed extract and urea as active ingredients.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a composition for controlling Nostoc commune, and more particularly to a composition that has a small impact on the environment and exhibits excellent control effect against Nostoc commune. [Background technology]

[0002] Nostoc commune is a species of terrestrial cyanobacterium belonging to the Nostoc genus, and grows naturally on bare ground such as in gardens, parks, roadsides, and in lawns. After rainfall or in constantly damp places, it is highly visible as a green agar-like colony. When dry, it shrinks and survives as a black scab-like substance that sticks to the ground. Stepping on Nostoc commune by mistake can be dangerous as it can make you slip, and it also ruins the plant's appearance, so in recent years there has been a growing demand for its eradication as an unpleasant plant.

[0003] As an agent for controlling Nostocaceae, for example, an organic chlorine fungicide such as captan, chlorothalonil, or fthalide has been proposed in combination with a dithiocarbamate such as propineb, mancozeb, maneb, thiuram, or ziram (Patent Document 1). However, as mentioned above, Nostocaceae inhabits environments close to people's lives, such as gardens and parks, and there are concerns about the effects on the human body, pets, plantations, etc., if the above-mentioned pesticides are applied to such places.

[0004] For this reason, there is a demand for the development of a safer star jelly control agent that has less impact on the human body and the environment, but there have been no reports yet of a component that combines such safety with high control effect against star jelly. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2015-224190 A Summary of the Invention [Problem to be solved by the invention]

[0006] An object of the present invention is to provide a composition for controlling Nostoc commune that has little impact on the environment and exhibits high control effect. [Means for solving the problem]

[0007] As a result of intensive research aimed at solving the above problems, the present inventors discovered that the combined use of grapefruit seed extract and urea exhibits an excellent control effect against Nostoc commune, and thus completed the present invention.

[0008] That is, the present invention relates to a composition for controlling Nostoc commune, which contains grapefruit seed extract and urea as active ingredients. Effect of the Invention

[0009] In the present invention, urea alone does not show a control effect against star jelly, but by using urea in combination with grapefruit seed extract, a synergistic control effect can be obtained, and star jelly can be quickly killed. In addition, both urea and grapefruit seed extract have little effect on the human body and the environment, and are excellent in safety. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] The composition for controlling Nostocaceae of the present invention uses grapefruit seed extract and urea in combination as active ingredients. Grapefruit seed extract is a mixture of ingredients such as fatty acids, ascorbic acid, flavonoids, etc. extracted from grapefruit seeds, particularly from the seeds of immature fruits, with water, ethanol, etc., and is a mixture of ingredients other than solvents (extraction solvents, dilution solvents). Grapefruit seed extract is listed on the list of existing food additives (Japan Food Additives Association (last revised February 26, 2020)), which describes that it is obtained by extracting grapefruit seeds (Citrus paradisi MACF.) of the Rutaceae family with water or ethanol, and that the main ingredients are fatty acids and flavonoids. Grapefruit seed extract may be commercially available as a mixture with water, glycerin, and other solvents (e.g., "Desfan-100" (sold by Mitsuba Trading, manufactured by INVETISA); "Desfan-10" (sold by Adept, Matsuo Pharmaceutical Industry). Desfan-100 contains approximately 60% by mass (hereinafter simply referred to as "%) of glycerin, approximately 5% water, and approximately 35% grapefruit seed extract. Desfan-10 contains approximately 6.2% glycerin, approximately 90.5% water, and approximately 3.3% grapefruit seed extract.

[0011] Grapefruit seed extract is generally produced as follows, but is not limited to this method. First, grapefruit seeds (preferably immature seeds; grapefruit from any region can be used) are crushed, and the crushed seeds are immersed in water, alcohols, hydrocarbons, esters, ketones, ethers, halogenated hydrocarbons, or mixed solvents thereof to extract, or are immersed and heated under reflux to extract, and then appropriately concentrated or concentrated and reduced to obtain the extract. Water and alcohol are preferably used as the extraction solvent. As the alcohol, either a monohydric alcohol or a polyhydric alcohol can be used, and preferred examples include water, ethanol, isopropyl alcohol, propylene glycol, 1,3-butylene glycol, glycerin, and mixed solvents thereof, and more preferred examples include water, ethanol, and mixed solvents thereof.

[0012] The urea used in the present invention is not particularly limited, and urea synthesized by a known synthesis method can be used.

[0013] In the Nostoc commune control composition of the present invention, the mass ratio of the grapefruit seed extract to urea is not particularly limited; however, from the viewpoint of the control effect against Nostoc commune, the mass ratio (grapefruit seed extract:urea) is preferably 20:1 to 1:10, and more preferably 10:1 to 1:1.

[0014] The composition for controlling Nostocaceae of the present invention may be prepared by mixing the grapefruit seed extract and urea as they are, or may be formulated using an agriculturally acceptable carrier. The formulation is not particularly limited, and examples include liquids such as solutions, emulsions, wettable powders, aqueous suspensions, and oily suspensions, and solids such as soluble powders and soluble granules. From the viewpoint of usability, liquids are preferred, and can be prepared according to known methods using liquid carriers such as water, alcohols such as ethanol, and polyhydric alcohols such as glycerin. Liquids include those that are directly applied to Nostocaceae, as well as concentrated types that are diluted with water or the like before use.

[0015] The content of grapefruit seed extract in the Nostoc commune-controlling composition of the present invention is not particularly limited and can be set as appropriate, but is preferably in the range of 0.1 to 20%, more preferably 0.5 to 10%, and even more preferably 1 to 8%, from the viewpoint of the control effect against Nostoc commune, etc. In the case of a concentrated type that is diluted before use, the content of grapefruit seed extract after dilution is preferably within the above range depending on the dilution ratio.

[0016] The content of urea in the Nostoc commune control composition of the present invention is not particularly limited and can be set appropriately, but is preferably 0.01 to 10%, more preferably 0.05 to 5%, and even more preferably 0.1 to 4% from the viewpoint of the control effect against Nostoc commune, etc. In the case of a concentrated type that is diluted before use, the content of urea after dilution is preferably within the above range depending on the dilution ratio.

[0017] If necessary, the Nostoc commune control composition of the present invention may contain known additives used in agricultural chemicals, such as preservatives, antioxidants, surfactants, pH adjusters, etc.

[0018] When made into a liquid formulation, the pH of the Nostocaceae control composition of the present invention is not particularly limited, but from the viewpoint of the Nostocaceae control effect, etc., it is preferably 2 to 10, more preferably 4 to 9, and even more preferably 6 to 8. In order to achieve such a pH range, the Nostocaceae control composition of the present invention preferably contains no more than 0.3% of organic acids such as acetic acid, malic acid, and lactic acid, more preferably no more than 0.1%, and even more preferably contains no organic acids.

[0019] The Nostocaceae control composition of the present invention can be applied to Nostocaceae that have appeared on the ground, lawns, etc., either as is or after diluting or dissolving in water, etc. The application method is not particularly limited, but examples include methods of scattering, spraying, and coating on the surface of the Nostocaceae. In order to enhance the control effect, it is preferable to apply the Nostocaceae control composition of the present invention after rainfall or by spraying water on the Nostocaceae in advance to cause them to swell. The application amount is not particularly limited, but for example, 1 m 2 The total amount of the active ingredient per plant is preferably 0.01 to 100 g, more preferably 0.1 to 60 g, and even more preferably 1 to 30 g. By applying the Nostoc commune control composition of the present invention to the Nostoc commune in this manner, the Nostoc commune changes color from green to dark green to brown to yellow-green, and then turns light brown to white, causing it to wither and die, and can be decomposed and disappeared. EXAMPLES

[0020] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples in any way.

[0021] Production Example 1: Preparation of a composition for controlling stone jelly A control composition was prepared according to the formulation shown in Table 1 below. Desfan-100 (containing 35% grapefruit seed extract; Mitsuba Trading, INVETISA) was used as grapefruit seed extract (GSE). Urea was also used (Kanto Chemical). The values ​​in the table indicate %.

[0022] [Table 1]

[0023] Test example 1: Control test against star jelly The control effect against star jelly was confirmed using the control composition prepared in Production Example 1. A wild star jelly was collected from outdoors and completely swollen with water. 10 g of each was placed outdoors, and 5 ml of each control composition was sprayed evenly onto the surface of the star jelly, and the star jelly was left as is. The appearance of the star jelly was observed 2, 7, 14, and 25 days after the spray treatment, and was evaluated on a 5-point scale according to the following criteria. The same test was also conducted for commercially available pesticide A (active ingredient ACN [2-amino-3-chloro-1,4-naphthoquinone] 50-fold diluted solution). The results are shown in Table 2.

[0024] (standard) 0: No change (green to dark green, no discoloration) 1: Partial discoloration (partially brown to yellow-green) 2: Overall discoloration (overall discoloration is brown to yellow-green) 3: Partially dead (partially discolored light brown to white) 4: Entire plant is dead (entire plant has turned light brown to white) 5: Partial decomposition (star jelly is obviously lost)

[0025] [Table 2]

[0026] As shown in Table 2, the use of grapefruit seed extract alone (Comparative Example 1) was effective in controlling star jelly, but it took 25 days for the entire plant to die. The use of urea alone (Comparative Example 2) was not effective at all. The use of commercially available pesticide A (Comparative Example 3) was only as effective as the use of grapefruit seed extract alone. In contrast, in the example in which grapefruit seed extract and urea were used in combination, the plants turned yellowish brown the day after treatment, completely died after 7 days, and were partially decomposed after 25 days. From this, it was confirmed that the combined use of grapefruit seed extract and urea significantly enhanced the effect of the grapefruit seed extract, significantly shortening the time until total death, and was highly effective in preventing star jelly infection, even though urea alone has no effect on star jelly control. [Industrial Applicability]

[0027] The composition of the present invention is highly effective in controlling Nostoc commune and is excellent in safety, and is therefore useful as a composition for controlling Nostoc commune.

Claims

1. A composition for controlling Nostoc commune, comprising grapefruit seed extract and urea as active ingredients, the mass ratio of the grapefruit seed extract to the urea being 20:1 to 1:

10.

2. 2. The composition for controlling stone jellyfish according to claim 1, wherein the content of the extract from the seed of the stone jellyfish is 0.1 to 20% by mass.

3. 3. The composition for controlling stone jelly according to claim 1 or 2, wherein the urea content is 0.01 to 10% by mass.

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