JP7366890B2 - How to control armyworms - Google Patents

Description

The present invention relates to a method for controlling armyworm.

Armyworms are the larvae of armyworms such as Spodoptera japonica and Armyworm armyworm, and are widely known as feeding-damaging pests that damage the growth of plants. Armyworms damage the leaves of crops such as vegetables, and are especially active at night and damage crops. Furthermore, under high temperature and dry environments, the occurrence and reproduction of armyworms tend to increase.

As a method for controlling armyworms, it is common to use agricultural chemicals that have an insecticidal effect on armyworms (for example, Ortolan hydrating agent, Sabrina flowable, Zentari granule hydrating agent, etc.). In addition, compositions that provide a high pest control effect even with a small amount of use and a small number of spraying times have been developed, one example of which is the insecticidal composition described in Patent Document 1. The insecticidal composition described in Patent Document 1 is an insecticidal composition characterized by containing S-methyl-N-[(methylcarbamoyl)oxy]thioacetimidate and live spores of Bacillus thuringiensis. . This insecticidal composition exhibits a cooperative and synergistic insecticidal effect against Spodoptera spp. It can be used even in situations where there are restrictions on the size of the device (see [Claim 1] and [Paragraphs 0047 and 0048] of Patent Document 1).

Japanese Patent Application Publication No. 9-301814

By the way, when applying chemicals such as pesticides as a measure to control armyworms, the impact on the human body and living things in the surrounding environment must be considered, but depending on the degree of feeding damage caused by armyworms, it may be necessary to apply a considerable amount of chemicals. It is possible that this could be done. In addition, it is difficult to obtain and apply drugs that are not commercially available, and even if they can be obtained, there are safety and persistence issues, and if the drug is highly toxic, Strict management is required. Incidentally, S-methyl-N-[(methylcarbamoyl)oxy]thioacetimidate contained in the insecticidal composition described in Patent Document 1 mentioned above is commonly called methomyl and is highly toxic. , at the moment, conditions are imposed on its purchase.

Therefore, it is an object of the present invention to provide a method for controlling armyworms that is safe and simple and provides a sufficient control effect.

As a result of intensive studies to achieve the above object, the present inventor discovered that by applying nanobubble water to plants, a sufficient control effect against armyworm can be obtained safely and easily, and the present invention was completed. Ta.
That is, the present inventor discovered that the above-mentioned problem can be achieved by the following configuration.

[1] A method for controlling armyworm by applying nanobubble water to plants.
[2] The method for controlling armyworm according to [1], wherein at least one of watering with the nanobubble water and spraying of an agricultural chemical diluted with the nanobubble water is performed.
[3] During the cultivation period of the plant, in a period corresponding to the rainy season, when the soil that is the medium for the plant dries and the leaves of the plant wither, watering is carried out using the nanobubble water. The method for controlling armyworm according to [2].
[4] The method for controlling armyworm according to [2] or [3], wherein the agrochemical diluted with the nanobubble water is attached to the leaf surface of the plant.
[5] The method for controlling armyworm according to any one of [1] to [4], wherein the most frequent particle diameter of the bubbles contained in the nanobubble water is 10 to 500 nm.
[6] The armyworm according to any one of [1] to [5], wherein the bubbles contained in the nanobubble water contain at least one gas selected from the group consisting of oxygen, nitrogen, ozone, and carbon dioxide. Control methods.
[7] The method for controlling armyworm according to any one of [1] to [6], wherein the nanobubble water has 1×10 ⁸ bubbles/mL to 1×10 ¹⁰ bubbles/mL.
[8] The method for controlling armyworm according to any one of [1] to [7], wherein the plant is a root vegetable or a leafy vegetable.
[9] The method for controlling armyworm according to [8], wherein the plant is ginger or cabbage.

According to the present invention, it is possible to provide a method for controlling armyworms that provides a sufficient control effect through safe and simple procedures.

It is a schematic diagram showing an example of a nanobubble generation device. This is an image of ginger harvested in Test Area I. This is an image of ginger harvested in Test Area II. This is an image of cabbage harvested in Test Area IV. This is an image of cabbage harvested in Test Area III.

The present invention will be explained in detail below.
Although the description of the constituent elements described below may be made based on typical embodiments of the present invention, the present invention is not limited to such embodiments.
In the present specification, a numerical range expressed using "~" means a range that includes the numerical values written before and after "~" as lower and upper limits.

<How to control armyworms>
The method for controlling armyworm of the present invention involves applying nanobubble water to plants.
Here, the term "arm armyworm" refers to the larvae of insects (moths) belonging to the subfamily Spodoptera of the family Lepidoptera, such as armyworm, armyworm, armyworm and armyworm.

In the present invention, as described above, by applying nanobubble water to plants, a sufficient effect of controlling armyworm can be obtained through a safe and simple procedure. The reason why such an effect is obtained is not clear in detail, but the inventor speculates as follows.
In other words, one of the reasons why the present invention was able to sufficiently control armyworms is that the plants absorb the applied nanobubble water, which activates the plants and improves their resistance to armyworms. Conceivable.
Another reason why the present invention was able to sufficiently control armyworms is that when a pesticide diluted with nanobubble water is applied, the pesticide adheres to the plant body due to the nanobubble water and spreads for a relatively long time. Therefore, it is thought that this is because the medicinal effects of pesticides were sustained over a long period of time.
As described above, according to the method for controlling armyworms of the present invention, it is possible to effectively control armyworms using nanobubble water, which is safer and easier to handle, without using highly toxic agricultural chemicals.

[Nano bubble water]
The nanobubble water used in the armyworm control method of the present invention is water containing air bubbles (nanobubbles) with a diameter of less than 1 μm, and more precisely, it is water mixed with nanobubbles. In addition, regarding "water mixed with nanobubbles", it is water used to generate nanobubble water (raw water for nanobubble water, for example, well water containing impurities), which is unavoidable due to its properties etc. Water that actually contains nanobubbles is excluded from the above-mentioned "water mixed with nanobubbles."

The diameter (particle size) of the bubbles contained in nanobubble water, the mode particle diameter of the bubbles, and the number of bubbles described below are values measured using the nanoparticle tracking analysis method of the Brownian motion movement speed of the bubbles in the water. In this specification, the values measured by the nanoparticle analysis system NanoSight series (manufactured by NanoSight) are used.
In addition, in the nanoparticle analysis system NanoSight series (manufactured by NanoSight), the diameter (particle size) can be calculated from the speed of the Brownian motion of the particle, and the mode particle size is the diameter of the particle that exists. It can be confirmed as a mode diameter from the particle size distribution of nanoparticles.

In the present invention, the mode particle size of the bubbles contained in the nanobubble water is preferably 10 to 500 nm, more preferably 30 to 300 nm, and particularly, because the effect of controlling armyworms is further improved. More preferably, the wavelength is 70 to 130 nm.

The gas constituting the bubbles contained in the nanobubble water is not particularly limited, but from the viewpoint of remaining in the water for a long time, gases other than hydrogen are preferable. Specifically, gases such as air, oxygen, nitrogen, fluorine, carbon dioxide, and ozone. Among these, it is preferable to contain at least one gas selected from the group consisting of oxygen, nitrogen, ozone, and carbon dioxide because the effect of controlling armyworms is further improved, and in particular, it is preferable to contain at least one gas selected from the group consisting of oxygen, nitrogen, ozone, and carbon dioxide. Also, since the bubbles can remain for a longer period of time, it is more preferable to include oxygen.
Here, containing oxygen means containing oxygen at a higher concentration than the oxygen concentration in the air. The same applies to nitrogen and carbon dioxide. Note that the concentration of oxygen in the bubbles is preferably 30% by volume or more, and preferably more than 50% by volume and not more than 100% by volume.

The above-mentioned nanobubble water preferably has 1×10 ⁸ to 1×10 ¹⁰ bubbles/mL for the reason that the effect of controlling armyworms is further improved. It is more preferable to have more than 1×10 ⁸ bubbles/mL and less than 1×10 ¹⁰ bubbles/mL, and 5×10 ⁸ bubbles/mL to 5 It is more preferable to have 10 ⁹ bubbles/mL.

Examples of the method for producing nanobubble water include a static mixer method, a venturi method, a cavitation method, a steam aggregation method, an ultrasonic method, a swirling flow method, a pressurized dissolution method, and a micropore method.
Here, the method for controlling armyworm of the present invention may include a generation step of generating the nanobubble water before applying the nanobubble water. That is, the armyworm control method of the present invention includes a generation step in which water (raw water) is taken from a water source such as a water storage tank, a well, or a tap water source into a nanobubble generation device to generate nanobubble water, and the generated nanobubble water is transferred to plants. The pest control method may also include an application step of applying to the body.
In addition, methods for introducing water from a water source into the nanobubble generation device include, for example, a method of pumping water from the water source using a bucket or pump and supplying it to the nanobubble generation device, and a method of introducing water between the water source and the nanobubble generation device. Examples include a method of connecting the flow path created by the nanobubble generation device to the nanobubble generation device and sending water directly from the flow path to the nanobubble generation device.

In addition, as the method for generating nanobubble water, a method using an apparatus that does not intentionally generate radicals is preferable, and specifically, for example, [0080] to [ of JP 2018-15715 A] [0100] A method of generating nanobubbles using the nanobubble generating device described in paragraph 1 is exemplified. Note that the above content is incorporated into this specification.

Other nanobubble generating devices that do not intentionally generate radicals include, for example, a liquid discharger that discharges water, a gas mixing machine that pressurizes and mixes gas into the water discharged from the liquid discharger, and A micro-bubble generator comprising: a micro-bubble generator that generates micro-bubbles in water by passing water mixed with a gas therein; An example is a micro-bubble generating device that pressurizes and mixes gas into the liquid flowing toward the micro-bubble generator in a pressurized state between the containers. Specifically, the nanobubble generation device shown in FIG. 1 can be mentioned.
The nanobubble generation device 10 shown in FIG. 1 includes a liquid discharger 30, a gas mixer 40, and a nanobubble generation nozzle 50 therein.
The liquid discharger 30 is configured by a pump, and takes in raw water (for example, well water) of nanobubble water and discharges it. The gas mixer 40 has a container 41 filled with compressed gas and a substantially cylindrical gas mixer main body 42, and while flowing water discharged from the liquid discharger 30 into the gas mixer main body 42, The compressed gas in the container 41 is introduced into the gas mixing machine main body 42. As a result, gas-mixed water is generated within the gas-mixer main body 42.
The nanobubble generation nozzle 50 generates nanobubbles in gaseous water according to the principle of pressurized dissolution by passing gaseous water therein, and its structure is described in Japanese Patent Application Laid-Open No. 2018-15715. The same structure as the nanobubble generation nozzle can be adopted. The nanobubble water generated in the nanobubble generation nozzle 50 is ejected from the tip of the nanobubble generation nozzle 50, flows out from the nanobubble generation device 10, and is sent to a predetermined user through a flow path (not shown).
As described above, in the nanobubble generation device 10, the gas mixing machine 40 compresses water (raw water) flowing toward the nanobubble generation nozzle 50 in a pressurized state between the liquid discharger 30 and the nanobubble generation nozzle 50. Mix gas. Thereby, problems such as cavitation that occur when gas is mixed into water on the suction side (suction side) of the liquid discharger 30 can be avoided. Furthermore, since the gas is mixed into the water in a pressurized (compressed) state, the gas can be mixed against the pressure of the water at the gas mixing location. Therefore, it is possible to appropriately mix gas into water without particularly generating negative pressure at the gas mixing location.
Further, a flow path for water supplied from a water source such as a well or tap water is connected to the suction side of the liquid discharger 30, and water flows into the liquid discharger 30 from the upstream side of the liquid discharger 30 in the flow path. It is preferable that the water pressure (that is, the water pressure on the suction side) is positive. In this case, the above configuration becomes more meaningful. That is, when the water pressure (suction pressure) on the upstream side of the liquid discharging machine 30 becomes positive pressure, gas is mixed into water on the downstream side of the liquid discharging machine 30, so that the water pressure on the downstream side of the liquid discharging machine 30 However, the configuration of the nanobubble generation device 10 that can appropriately mix gas into water becomes more prominent.

Moreover, the water (raw water) used to generate the nanobubble water is not particularly limited, and for example, rainwater, tap water, well water, agricultural water, distilled water, etc. can be used.
Such water may be subjected to other treatments before being used to generate nanobubble water. Other treatments include, for example, pH adjustment, precipitation, filtration, and sterilization (sterilization). Specifically, for example, when using agricultural water, the agricultural water may typically be used after being subjected to at least one of precipitation and filtration.

[Application mode of nanobubbles]
In the present invention, the manner in which the nanobubble water is applied to the plant is not particularly limited as it varies depending on the cultivation method of the plant, but for example, the manner in which the nanobubble water is sprinkled in soil cultivation, the manner in which the nanobubble water is applied in soil cultivation, etc. In a method of spraying a pesticide diluted with nanobubble water, in hydroponic cultivation (hydroponics, spray cultivation, or solid medium cultivation) or hydroponic cultivation (cultivation with simultaneous irrigation), the culture solution diluted with the nanobubble water is used as a medium. Examples include a mode of supplying the nanobubble water, and a mode of watering (irrigating) the nanobubble water alone in nutrient soil cultivation. Note that these application modes are merely examples, and any mode may be used as long as the nanobubble water can be suitably applied during the growth process of the plant.
In addition, since the operation is simple and the armyworm can be effectively controlled, it is preferable to perform at least one of watering using the nanobubble water and spraying an agricultural chemical diluted with the nanobubble water. It is more preferable to perform both watering using the nanobubble water and spraying of an agricultural chemical diluted with the nanobubble water.
In addition, in soil cultivation, especially in open field cultivation, the effect of controlling armyworms by applying the nanobubble water becomes remarkable.

In addition, the method of sprinkling the nanobubble water is not particularly limited, but includes, for example, a method of spraying it on a part of the plant, a method of spraying or spraying water on the soil where the plant is planted, a method of dripping it onto the soil, and Examples include a mode in which water is irrigated into the soil from a drip tube buried in the soil.

The timing and frequency of watering is not particularly limited as it varies depending on the cultivation area and weather, but since armyworms are more likely to occur in dry environments with little rainfall, watering should be done during the rainy season during the plant cultivation process. It is more desirable to carry out the watering process using the nanobubble water when there are consecutive days other than rainy days during the relevant period. Here, "the period corresponding to the rainy season" is a period when a certain amount of precipitation or more is expected in a normal year, and in Japan it is a period from June to August. During this period, it is recommended to carry out the watering process using the nanobubble water on days other than rainy days, specifically, when the number of clear, sunny, and cloudy days continues for a predetermined number of days (for example, about two weeks) or more. desirable.
To describe a more preferable form of watering, the above-mentioned nanobubble water can be used during the rainy season during the cultivation period of the plant, when the soil, which is the medium for the plant, dries out and the leaves of the plant wither. It is a good idea to perform regular watering. Here, "withering of the leaves" refers to the state in which the leaves (particularly the tips) turn brown and wither due to lack of moisture.
In addition, when cultivating ginger, the rainy season is usually the period when the number of leaves above the ground during the growth stage of ginger is 4 to 6 or more, and there are consecutive non-rainy days during that period. In some cases, watering using the nanobubble water described above may be carried out.

There are no particular limitations on the method of spraying pesticides, but examples include spraying or dropping onto the soil or plants, and scattering or dropping from above the plants. Either method may be used, such as a method in which the material is sprayed by the sprayer, or a method in which the material is sprayed by applying pressure from a sprinkler nozzle. In addition, in order to effectively express the medicinal effects of pesticides, methods of attaching pesticides diluted with nanobubble water to the leaf surfaces of plants (e.g., spraying, applying to the leaves, and applying them from above) are recommended. scattering, etc.) is desirable.

In addition, the timing of spraying pesticides is not particularly limited as it varies depending on the cultivation area and weather, but in terms of effective control of armyworms, it is best to spray at the end of the rainy season (for example, at the end of the rainy season). ) is recommended. In particular, as mentioned above, armyworms breed more easily when dry, so if there are more than a predetermined number of consecutive non-rainy days during the rainy season (for example, during the rainy season) during the plant cultivation process, It is best to spray pesticides.

Furthermore, the number of times pesticide spraying is not particularly limited as it varies depending on the type of pesticide, etc., and may be carried out once or more, but preferably, the nanobubble water It is best to spray the agrochemical diluted using the same method multiple times (specifically, 2 to 3 times). Furthermore, as described above, in order to effectively express the medicinal efficacy of the pesticide, it is preferable that the pesticide diluted with nanobubble water be attached to the leaf surface of the plant during each spraying.

[Pesticides]
The agent used in the method for controlling armyworm of the present invention is not particularly limited, and known agricultural chemicals can be appropriately used as insecticides for armyworm. Such agricultural chemicals include, for example, Zentari granular wettable powder, Prevason Flowable, Ortran wettable powder, Marathon emulsion, Sumithion emulsion, Benicaveziful emulsion, Benica R emulsion, Benica S emulsion, Elsan emulsion, Ensedan emulsion, and Phoenix granules. Examples include hydrating powders, preo flowables, match emulsions, Sabrina flowables, etc., and these may be used alone or in combination of two or more.

In the present invention, the amount of pesticide used is not particularly limited, but it is preferably 0.00001 to 10 parts by mass, more preferably 0.00005 to 5 parts by mass, based on 100 parts by mass of the nanobubble water. preferable.

[Other ingredients]
The nanobubble water may contain components other than the pesticide.
Examples of the other components include fertilizers, surfactants, antifreeze agents, antifoaming agents, preservatives, antioxidants, and thickeners. The types and contents of the other components are not particularly limited and can be selected depending on the purpose.
Further, in the present invention, it is preferable that the nanobubble water does not substantially contain radicals as the other components. Regarding "substantially free of radicals", in cases where radicals are unavoidably contained due to the water used to generate the nanobubble water (for example, well water containing impurities), "substantially free of radicals" It means that it does not substantially contain it. On the other hand, the case where radicals generated by some kind of artificial operation are mixed in does not mean that the material is "substantially free of radicals."

[Plant]
In the present invention, the plants to which the nanobubble water is applied may be any plants that are likely to be damaged by armyworms.
Specifically, for example, fruit trees (e.g., grapes, citrus, peaches, etc.);
Fruit vegetables, more specifically, plants of the family Solanaceae (e.g., eggplants, tomatoes, peppers, cucumbers, etc.), plants of the Cucurbitaceae family (e.g., watermelons, melons, etc.), and plants of the Rosaceae family (e.g., strawberries, etc.);
Legumes (such as soybeans, beans, peas, and broad beans);
Root vegetables (such as potatoes, sweet potatoes, taro, radish, carrots, ginger, and burdock);
Stem vegetables (such as green onions and onions);
Leafy vegetables (e.g. cabbage, Chinese cabbage, Osaka Shirona, Japanese chrysanthemum, lettuce, Japanese cabbage, spinach, etc.);
Ornamental plants (such as chrysanthemums, celosia, carnations, pansies, peonies, and stocks);
can be mentioned.
Among these, root vegetables and leafy vegetables are more preferred, and ginger or cabbage is particularly preferred.

Hereinafter, the present invention will be explained in more detail with reference to Examples. The materials, usage amounts, proportions, processing details, processing procedures, etc. shown in the following examples can be changed as appropriate without departing from the spirit of the present invention. Therefore, the scope of the present invention should not be construed as being limited by the Examples shown below.

(Test 1)
<Test details>
Test 1 was conducted from April to September 2017 in a ginger (variety: large ginger) field in Gyoda City, Saitama Prefecture, using the following classifications. Note that Test Areas I and II are set in the same field.
Test plot I: Ginger was cultivated in open field cultivation, and nanobubble water was used for watering the ginger and diluting the pesticide (specifically, Trebon powder) to be sprayed.
Experimental area II: Ginger was cultivated in the open field, and nanobubble water was not used for watering the ginger and diluting the pesticide (specifically, Trebon powder) to be sprayed, but normal water (water that does not contain nanobubbles) was used. ) was used.
In each test plot, 1,500 seed ginger plants were planted and ginger was cultivated according to a conventional method.
In addition, the frequency and amount of watering were determined according to the weather during the cultivation period, and were adjusted so that they were approximately the same in both test plots. In addition, during the rainy season in 2017, when the test was conducted, the amount of rainfall was lower than usual due to a series of sunny or sunny days, and the number of days other than rainy days (specifically, sunny or sunny days) was approximately 2 weeks. Watering was carried out during the following period.
In addition, the type, timing, dilution rate, and number of applications of the applied pesticide were set according to conventional methods, and adjusted so that they were approximately the same in both test plots. Specifically, the above-mentioned Trebon powder was diluted to a predetermined concentration and sprayed once in late July.

<Method for generating nanobubble water>
Nanobubble water is produced by generating air bubbles (nanobubbles) in water using a pressurized dissolution method using a nanobubble generator (manufactured by Kakuichi Manufacturing Co., Ltd. Aqua Solution Division (currently Aqua Solution Co., Ltd., 100 V, 10 L/min type)). It was generated by
The water (raw water) used to generate nanobubble water was tap water, and the type of gas constituting the bubbles was oxygen (industrial oxygen, concentration: 99.5% by volume).
Moreover, the conditions for generating nanobubbles using the above-mentioned nanobubble generation device were as follows.
Number of bubbles per mL of water: 5 x 10 ⁸ bubbles/mL
Bubble size (modest particle diameter): 100nm

<Evaluation of armyworm control>
Ginger grown in each test plot was harvested in September 2017, and one arbitrarily selected plant in each test plot was checked for feeding damage caused by armyworms. Specifically, the presence or absence of feeding damage by armyworms was confirmed by measuring the size of the stems of the plants to be evaluated. As shown in FIGS. 2 and 3, in test plot I, the ginger stems were enlarged compared to test plot II, and a larger yield was obtained. In other words, it was confirmed that feeding damage caused by armyworms was suppressed in Test Area I compared to Test Area II. In addition, Figure 2 shows an image of ginger in Test Group I, and Figure 3 shows an image of ginger in Test Group II, and each figure shows one ginger plant selected in each test group. The illustration shows the width measured when the item is laid on its side.

(Test 2)
<Test details>
Test 2 was conducted from August 2018 to October 2018 in a cabbage field in Komoro City, Nagano Prefecture, in the following three categories. Test plots III, IV, and V are set in the same field and are adjacent to each other.
Test plot III: Cabbage was cultivated in open field cultivation, and regular agricultural water, not nanobubble water, was used for watering during planting and during drying.
Test area IV: Cabbage was cultivated in the open field, and nanobubble water in which the number of bubbles per mL of water was adjusted to 2 x 10 ⁸ cells/mL was used for watering during planting and drying.
Test section V: Cabbage was cultivated in the open field, and nanobubble water with the number of bubbles adjusted to 5 x 10 ⁸ bubbles/mL per mL of water was used for watering during planting and drying.
In each test plot, 40 cabbage seedlings were planted and cabbage was cultivated according to a conventional method. Furthermore, the frequency and amount of watering during planting and drying were adjusted to be approximately the same in the three test plots. Note that the dry period is a period in which no rain has fallen for one week. In addition, in Test 2, in order to test the superiority of the number of bubbles in 1 mL of nanobubble water, spraying of pesticides, which is carried out in normal cultivation methods, was not intentionally carried out.

<Method for generating nanobubble water>
Nanobubble water was generated by generating air bubbles (nanobubbles) in agricultural water using the same nanobubble generator as in Test 1. As described above, the number of bubbles per mL of nanobubble water was 2 x 10 ⁸ bubbles/mL in test area IV, and 5 x 10 ⁸ bubbles/mL in test area V. The number of bubbles per 1 mL of nanobubble water can be determined by, for example, installing a nanobubble water storage tank downstream of the nanobubble generation device described above, returning the nanobubble water in the storage tank to the nanobubble generation device, and circulating the nanobubble water within the system. This can be adjusted by changing the circulation time.
The other nanobubble water generation conditions were the same between Test 1 and Test 2.

<Evaluation of armyworm control>
In September 2018, 40 cabbage plants grown in each test plot were harvested, and the degree of feeding damage (degree of insect damage) on the cabbage leaves was evaluated according to the evaluation classification below for the 40 plants grown in each test plot. We evaluated the number of stocks that fall into each evaluation category.
[Evaluation category]
``No feeding damage'': No feeding damage was observed on the leaves ``Small feeding damage'': There were noticeable feeding damage on the outer leaves, but the product can be shipped. "Severe feeding damage": There are areas of feeding damage throughout the leaf, making it difficult to ship as a product. The evaluation results for each test group are shown in Table 1 below. Further, FIG. 4 shows the appearance of the cabbage with relatively little eating damage harvested in test plot IV, and FIG. 5 shows the appearance of the cabbage with heavy eating damage harvested in test plot III.

As is clear from the above evaluation results, feeding damage occurred in all test plots, but the scale of the feeding damage was suppressed in test plots IV and V where nanobubble water was applied than in test plot III where nanobubble water was not applied. Ta. In addition, when comparing the evaluation results between Test Groups IV and V, the number of bubbles in 1 mL of nanobubble water is 2 × 10 ⁸ bubbles/mL in Test Group IV, which is 5 × 10 ⁸ bubbles/mL. It became clear that the scale of feeding damage was smaller with V.
As explained above, the test results of Test 1 and Test 2 revealed the effectiveness of nanobubble water in controlling armyworms.

10 Nanobubble generation device 30 Liquid discharge machine 40 Gas mixing machine 41 Container 42 Gas mixing machine main body 50 Nanobubble generation nozzle

Claims (7)

Nanobubbles are generated in water using a pressure dissolution method to generate nanobubble water.
Performing watering using the nanobubble water and applying the nanobubble water to the plant body,
The modem particle diameter of the bubbles contained in the nanobubble water is 10 to 500 nm,
A method for controlling armyworms , wherein the bubbles contained in the nanobubble water contain oxygen .
Here, the embodiment in which the bubbles contain oxygen refers to the embodiment in which the bubbles contain oxygen at a higher concentration than the oxygen in the air. The method for controlling armyworm according to claim 1, wherein both watering using the nanobubble water and spraying of an agricultural chemical diluted using the nanobubble water are carried out. Watering using the nanobubble water is performed when the soil serving as a medium for the plant dries and leaves of the plant wither during the rainy season during the cultivation period of the plant. The method for controlling armyworm according to item 2. The method for controlling armyworm according to claim 2 or 3, wherein the agricultural chemical diluted with the nanobubble water is attached to the leaf surface of the plant. The method for controlling armyworm according to any one of claims 1 to 4 , wherein the nanobubble water has 1×10 ⁸ bubbles/mL to 1×10 ¹⁰ bubbles/mL. The method for controlling armyworm according to any one of claims 1 to 5 , wherein the plant is a root vegetable or a leafy vegetable. The method for controlling armyworm according to claim 6 , wherein the plant is ginger or cabbage.