Whitehead inhibitor and its uses

Abstract

To provide a technology that can efficiently suppress white panicle of gramineous plant and increase rice production efficiency.SOLUTION: The present invention provides a white panicle inhibitor for gramineous plant that contains an oily component. The oily component is preferably hydrocarbon-based, more preferably paraffin. By adhering the white panicle inhibitor to the panicle of gramineous plant, the white panicle of gramineous plant can be suppressed, and the production of gramineous plant, and thus the efficient production of rice, can be achieved.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to an agent for suppressing white head and use thereof. [Background technology]

[0002] When föhn winds (hot, dry winds) occur, mainly at night, immediately after rice ears emerge, the ears of grasses turn white due to drying, resulting in reduced yield and quality. Areas where föhn damage occurs frequently are the Hokuriku region and the Tohoku region along the Sea of ​​Japan, which overlap with the main rice-producing areas. For this reason, föhn damage is a major problem that affects rice crop conditions and grades.

[0003] In addition to information provided by the Japan Meteorological Agency, a cultivation management support system provided by the National Agriculture and Food Research Organization makes it possible to predict föhn risk in detail, and operation has begun in some areas. Local governments in areas where föhn is common are providing thorough guidance on flooding and flooding fields before föhn occurs. In addition, Non-Patent Document 1 describes that the reduction in quality and yield caused by föhn at night can be suppressed by applying silicic acid materials to fields.

[0004] On the other hand, Patent Documents 1 and 2 describe that the surface gloss and color tone can be maintained by treating fruits and vegetables with a solution containing shellac resin and glycerin fatty acid in a specific ratio, and with tannin, respectively. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 58-89140 [Patent Document 2] JP 2008-54529 A [Non-patent literature]

[0006] [Non-Patent Document 1] Shiratori et al., Abstracts of the 2017 Japanese Society of Soil Science and Plant Nutrition 64.261 Summary of the Invention [Problem to be solved by the invention]

[0007] However, flooding the field may not be sufficient to suppress white heads. In addition, in terms of water use, it may not be possible to simultaneously flood the fields in the entire region. Furthermore, the application of silicic acid to the field described in Non-Patent Document 1 must be carried out by the early stage of growth, and may not be possible before the occurrence of foehn. Furthermore, Patent Documents 1 and 2 do not mention gramineous plants as targets for application, let alone gramineous plants after the heading stage, and there is no mention at all of the effect of treating the ears of gramineous plants in suppressing white heads.

[0008] An object of the present invention is to provide a technique capable of efficiently suppressing white heads in gramineous plants and increasing rice production efficiency. [Means for solving the problem]

[0009] The present invention provides the following [1] to

[10] . [1] An agent for suppressing white head of grass plants, containing oily ingredients. [2] The white head inhibitor according to [1], wherein the oil component is a hydrocarbon-based oil component. [3] The white head inhibitor according to [1] or [2], wherein the oily component is paraffin. [4] The white head inhibitor according to any one of [1] to [3], wherein the content of the oily component is 0.01% by weight or more based on the total amount of the white head inhibitor. [5] A method for suppressing white heads of a grass plant, comprising attaching the white head inhibitor according to any one of [1] to [4] to the ears of the grass plant. [6] The method for suppressing white heads according to [5], wherein the ears of the grass family plant are ears within 7 days after heading. [7] A method for producing a grass plant, comprising attaching the white head inhibitor according to any one of [1] to [4] to panicles of the grass plant. [8] The method for producing a grass plant according to [7], wherein the ears of the grass plant are ears within 7 days after heading. [9] A method for producing rice, comprising attaching the white head inhibitor according to any one of [1] to [4] to rice ears.

[10] The method for producing rice described in [9], wherein the rice ears are ears within 7 days after heading. Effect of the Invention

[0010] According to the present invention, there is provided a white head inhibitor capable of efficiently suppressing the occurrence of white heads in grasses, which is expected to contribute to maintaining or improving the yield and quality of grasses, particularly rice, and to suppress the effects on crop conditions and grades and improve production efficiency even in areas where white head damage has traditionally occurred frequently, such as areas frequently affected by föhn winds. [Brief description of the drawings]

[0011] [Figure 1] Figure 1 shows the results of Examples 1 to 5 and Comparative Example 1 (control). In Figure 1, the vertical bars indicate standard error. *, **, and *** indicate cases where the degree of whitening of the ear was smaller than that of the control at the 5%, 1%, and 0.1% levels, respectively, in Dunnett's multiple comparison test. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] [White head suppressant] The agent of the present invention contains an oily component. This allows it to exert an effect of suppressing white head of grasses. The agent of the present invention may contain at least one oily component, and may contain two or more oily components.

[0013] The oily component is not particularly limited, and may be any of animal oil, vegetable oil, mineral oil, and synthetic oil. Examples of mineral oil include petroleum oil (e.g., paraffin (e.g., paraffin wax, liquid paraffin, heavy liquid isoparaffin), microcrystalline wax), ozokerite, ceresin, and silicone oil. Examples of animal oil include head, lard, liver oil, horse oil, fish oil, and beeswax. Examples of vegetable oil include soybean oil, rapeseed oil, olive oil, avocado oil, sesame oil, castor oil, wood wax, carnauba wax, candelilla wax, and montan wax. Examples of synthetic oil include petrolatum and polyisobutylene. Among these, oils mainly composed of hydrocarbons (hydrocarbon-based oils) are preferred, and paraffin is more preferred. As long as it is solid at room temperature, it is usually called wax. There is no particular limit to the origin, and any of natural oils, synthetic oils, and blended oils may be used, but hydrocarbon-based oils are preferred. Examples of the hydrocarbon oil include paraffin, microcrystalline wax, beeswax, Japan wax, carnauba wax, candelilla wax, montan wax, ozokerite, ceresin, and rice wax. Of these, petroleum-based hydrocarbon oils are preferred, and paraffin is more preferred.

[0014] <Oily ingredient content> The content of the oily components in the agent of the present invention (when there are two or more oily components, the total content of them) is not particularly limited, but is preferably 0.01% by weight or more, and more preferably 0.02% by weight or more. This allows for a good effect of inhibiting white heads. The upper limit is not particularly limited, but is preferably 2.0% by weight or less, and more preferably 1.0% by weight or less. This allows for the maintenance of workability when using the agent (for example, suppression of clogging in a sprayer).

[0015] The content of the oily component may be adjusted by adjusting the amount dissolved in the solvent. Examples of the solvent include aqueous solvents (e.g., water, alcohol, a mixture of water and alcohol), and water is preferred. It is preferable to further include an emulsifier together with the solvent. The emulsifier is not particularly limited, and one or a combination of two or more emulsifiers that can be used in agricultural solvents may be used.

[0016] <Dosage form> The formulation of the agent of the present invention is not particularly limited, but a formulation that is easy to apply to the ears of the grass family plant is preferable, for example, a liquid system (liquid, suspension, dispersion, paste, gel, etc.), and liquid, suspension, and dispersion are preferable. This allows the workability when using the agent to be maintained (for example, suppression of clogging in the sprayer).

[0017] <Optional ingredients> The agent of the present invention may contain optional components other than the oil component, such as the above-mentioned emulsifiers and solvents, fertilizer components (e.g., inorganic components such as calcium, manganese, boron, and water-soluble compounds thereof), preservatives, pigments, and pH regulators.

[0018] <White panicle suppression effect> The agent of the present invention has a white head suppressing effect on gramineous plants. In this specification, the white head suppressing effect refers to an effect of suppressing the occurrence of white heads on gramineous plants. White heads generally refer to the surface of ears turning white. White heads are often caused by the Föhn phenomenon (e.g., dry strong winds caused by typhoons), and the agent of the present invention can efficiently suppress the occurrence of white heads caused by the Föhn phenomenon.

[0019] <Gramineous plants> Examples of the grass family include rice (Oryza sativa). The rice may be either paddy rice or upland rice, but paddy rice is preferred. The rice variety is not particularly limited, and may be any of japonica, indica, and javanica, and may be any of edible, feed, and ornamental varieties such as non-glutinous rice, glutinous rice, and sake rice, but varieties that are prone to white heads are preferred.

[0020] [White panicle control method] The white head inhibitor of the present invention can be used to suppress white heads of a gramineous plant by attaching it to the ears of the gramineous plant. The method for suppressing white heads of a gramineous plant of the present invention includes attaching the white head inhibitor to the ears of the gramineous plant (attachment treatment). In the attachment treatment, the method for attaching the white head inhibitor to the ears of the gramineous plant is not particularly limited, and examples include spraying and coating, with spraying being preferred. In the case of spraying, equipment such as a mister-type pesticide applicator or sprayer may be used.

[0021] The amount of oil adhering to the ears may be any amount that adheres to the surface of the ears, and for example, the amount of oil per ear is preferably 0.01 mg or more, more preferably 0.1 mg or more. There is no particular upper limit, but it is usually 1 mg or less.

[0022] The time to apply the white head inhibitor may be any time after heading, preferably within 7 days after heading, more preferably immediately after heading to 5 days after heading. The number of times of application may be at least once, and may be two or more times. In addition, when the föhn risk can be predicted, it is preferable to complete the application treatment before the predicted time. In Japan, the prediction of the föhn risk can be made using the warning information sent by the National Agriculture and Food Research Organization's "Cultivation Management Support System". In addition, it is preferable to perform the treatment promptly during the period when föhn is likely to occur (e.g., during typhoons, midsummer). The application treatment may be combined with other white head inhibition treatments (e.g., flooding the field, application of silicic acid materials). When other white head inhibition treatments are combined, the order of treatments is not particularly limited, and they may be performed before, after, or both of the application treatment.

[0023] [Method for producing grasses] The white head inhibitor of the present invention can be used in the production of grasses, since it can suppress white heads by attaching it to the ears of the grasses. The method for producing grasses of the present invention includes attaching the white head inhibitor to the ears of the grasses (attachment treatment). The attachment treatment may be performed in the same manner as explained in the section explaining the white head suppression method, and other than the attachment treatment, the cultivation may be performed in the same manner as in the cultivation of normal grasses. In addition, it is also possible to combine other white head suppression treatments as necessary, as explained in the section explaining the white head suppression method.

[0024] [Rice production method] The white head inhibitor of the present invention can be used in rice production because it can suppress white heads by adhering it to rice ears. The rice production method of the present invention includes adhering the white head inhibitor to rice ears (adhering treatment). The adhering treatment may be carried out in the same manner as explained in the section explaining the white head suppressing method, and other than the adhering treatment, the cultivation may be carried out in the same manner as normal rice cultivation. In addition, it is also possible to combine other white head suppressing treatments as necessary, as explained in the section explaining the white head suppressing method. EXAMPLES

[0025] The present invention will be described in detail below with reference to examples. The following examples are provided to suitably explain the present invention, but are not intended to limit the present invention. In the following, % refers to % by weight unless otherwise specified.

[0026] Examples 1 to 5 20 seeds of the rice variety "Nikomaru" were sown in 11 1 / 5000a Wagner pots, and only the main stems were grown outdoors. Just before ear emergence, they were moved to an artificial climate room at 24 / 26°C (day / night). A paraffin solution (paraffin concentration is shown in Figure 1) was prepared as a material for each example, and 20 ml of this was sprayed per pot during the day on ears (approximately 10 to 15 ears per pot) 2 to 4 days after ear emergence using a spray-type pesticide sprayer (paraffin spray amount per ear: 6 mg, 3 mg, 1.5 mg, 0.6 mg, 0.3 mg for Examples 1 to 5, respectively). That night, in the artificial climate room (temperature 33°C, humidity 52%), a strong wind with a wind speed of 7 m / s was blown toward the ears of rice using a blower for 4 hours. The day after treatment, the degree of whitening of the ears was evaluated on a 7-point scale (0: no whitening, 1: slight whitening of the ears, 2: 1 / 4 of the ears whitening, 3: 1 / 2 of the ears whitening, 4: 3 / 4 of the ears whitening, 5: most of the ears whitening, 6: complete whitening of the entire ear), and the average value for each pot was calculated (Figure 1: n = 11).

[0027] Comparative Example 1 The same procedure as in Example 1 was carried out except that water was used instead of the materials used in Example 1.

[0028] Compared to Comparative Example 1, in Examples 1 to 5, whitening of ears caused by foehn was suppressed, and the degree of whitening of ears tended to be smaller as the paraffin concentration was higher (Figure 1). These results show that the agent of the present invention can efficiently suppress the occurrence of white heads in grasses.

Claims

1. An agent for suppressing white head of a grass family plant, comprising an oily component, The oil component is one or more hydrocarbon-based oil components selected from the group consisting of paraffin, microcrystalline wax, beeswax, Japan wax, carnauba wax, candelilla wax, montan wax, ozokerite, ceresin, and rice wax; It is applied by attaching it to the ears of grasses. Whitehead inhibitor.

2. The agent for suppressing white heads according to claim 1, wherein the oily component is paraffin and / or microcrystalline wax.

3. 3. The agent for suppressing white heads according to claim 1 or 2, wherein the oily component is paraffin.

4. The white head inhibitor according to any one of claims 1 to 3, wherein the content of the oily component is 0.01% by weight or more based on the total amount of the white head inhibitor.

5. A method for suppressing white heads of a grass plant, comprising attaching the white head inhibitor according to any one of claims 1 to 4 to the ears of the grass plant.

6. 6. The method for suppressing white heads according to claim 5, wherein the ears of the grass family are ears within 7 days after heading.

7. A method for producing a grass plant, comprising attaching the white head inhibitor according to any one of claims 1 to 4 to panicles of the grass plant.

8. 8. The method for producing a gramineous plant according to claim 7, wherein the panicle of the gramineous plant is within 7 days after heading.

9. A method for producing rice, comprising attaching the white head suppressor according to any one of claims 1 to 4 to ears of rice.

10. The method for producing rice according to claim 9 , wherein the rice panicles are panicles within 7 days after heading.

Images