JP2009249364A - Soil-borne disease controlling agent for oryza sativa - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a soil-borne disease controlling agent which exhibits high controlling effects against hardly controllable soil-borne diseases of Oryza sativa, does not cause environmental pollution, is not phytotoxic to Oryza sativa, is safe to humans and animals, and is surely effective. <P>SOLUTION: The soil-borne disease controlling agent contains acetic acid as the principal component. Soil-borne diseases of Oryza sativa which have been conventionally hard to control can be efficiently controlled without producing phytotoxicity to Oryza sativa by pouring into soil still higher concentration of acetic acid, which has been used in low concentration because of its phytotoxicity. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention is an agricultural and horticultural fungicide containing acetic acid as an active ingredient, and relates to a plant control system. This system is not only highly effective, but also has the characteristics that it does not cause phytotoxicity on plants and has excellent safety.

  Since rice seedlings promote seed germination at high temperature and high humidity, phytopathogenic fungi in the soil typified by Psium, Fusarium, Trichoderma and Rhizopus tend to grow. Furthermore, when a rice plant body is exposed to low temperature during the seedling raising period, the resistance of the rice plant body is reduced, and the rice plant body is invaded by the phytopathogenic fungus that has proliferated, causing frequent damage. Such a technique for controlling soil-borne diseases is currently lacking effective means despite the demands of the field.

  Conventionally, soil disinfection using fumigants, steam, or solar heat has been performed as a means of controlling soil-borne diseases. However, the use of highly toxic fumigants can cause environmental pollution or non-selective sterilization of microorganisms in the soil, which greatly changes the microflora of the soil, which in turn promotes disease. Was also awake. Disinfection of soil with steam or solar heat requires large-scale facilities and is burdensome in terms of economy and labor. On the other hand, treating other soils with chemically synthesized pesticides that are effective against soil diseases has also been performed. However, the effect is not always satisfactory, and moreover, due to the recent safety orientation, there has been a strong demand to reduce the use of chemically synthesized pesticides as much as possible.

  In recent years, biological control methods using natural compounds such as sodium bicarbonate and acetic acid and microorganisms that are not pathogenic to plants have been used as safer disease control materials to replace chemically synthesized pesticides. It has become to.

  As a product using sodium hydrogen carbonate, there is "trade name: Hermate", which is sprayed on the foliage to obtain disease control effect, and it has low or no effect on soil disease. .

  Patent Document 1 describes an invention of a plant powdery mildew and mildew control agent comprising an aqueous acetic acid solution as an active ingredient, but this is also only a control technique to be sprayed on the foliage. The invention of Patent Document 1 is not intended for rice, does not apply an active ingredient to a seedling culture medium, and does not describe anything about effects on soil-borne diseases.

  Patent Document 2 discloses an invention relating to a disinfectant for seed fir containing acetic acid and having a pH of 3.1 or higher. This is a technique for controlling seed infectious diseases by directly treating seeds. Yes, the effect on soil-borne diseases is not described. Thus, although the antibacterial action of acetic acid has been conventionally known, it has only been used for seed disinfection or foliage diseases, and no examples of use for soil diseases are known. Moreover, in order to obtain a high control effect using acetic acid, it is necessary to increase the concentration, but at the same time, there is a high possibility of causing phytotoxicity to plants.

As described above, the direct (soil) treatment in which acetic acid is irrigated to a seedling culture medium such as rice seedling soil has not been described at all and is novel. Furthermore, the control of soil infectious diseases such as rice seedling blight caused by the treatment of acetic acid on rice seedling cultures is unknown and novel. Therefore, the invention described in this claim concerning the control of soil infectious diseases by treatment of rice seedling culture medium such as rice seedling soil, rather than disinfection of seed rice by acetic acid, is novel and has inventive step. Therefore, it has sufficient patent requirements.
JP 55-55102 A JP 2005-350408 A

  This invention is made | formed from the said viewpoint, and makes it a subject to provide the soil disease control agent for rice with higher safety | security which can be replaced with the control method by a chemically synthesized pesticide.

  As a result of intensive studies to solve the above-mentioned problems, the present inventors have conventionally irrigated the soil with a higher concentration of acetic acid that has been used at a low concentration to cause phytotoxicity to plants, The present inventors have found that soil diseases that have conventionally been difficult to control can be efficiently controlled, and that no phytotoxicity is caused to rice, and the present invention has been completed.

  That is, the present invention is characterized by efficiently controlling soil diseases without causing chemical damage to rice by irrigating acetic acid to a seedling culture medium such as soil. It is the rice soil disease control method shown.

  (1) A soil disease control agent for rice containing acetic acid as a main component (active ingredient) but having an acetic acid: sodium molar ratio in the range of 10: 0 to 10: 4, before sowing, before soil covering, A rice soil disease control method, comprising: irrigating a rice seedling culture medium (or admixing treatment with a rice seedling culture medium) at least at one time during a seedling raising period.

  (2) The rice soil disease is a rice seedling blight caused by a microorganism belonging to at least one of Pythium, Fusarium, Trichoderma, Rhizopus The method for controlling rice soil diseases according to (1).

  (3) Irrigation treatment containing a soil disease control agent for rice, which contains acetic acid as a main component (active ingredient) but has an acetic acid: sodium molar ratio in the range of 10: 0 to 10: 4, in the form of an aqueous solution. (Or at least one of admixing treatment with a seedling culture medium, for example, mixing of the whole amount, covering soil, mixing with floor soil), (1) or (2) soil disease control method of rice.

  (4) The rice soil disease control method according to any one of (1) to (3), wherein the rice seedling culture medium is at least one selected from seedling culture soil, rock wool, and paddy soil .

  (5) A soil disease control agent for rice containing acetic acid as a main component (active ingredient) but having a molar ratio of acetic acid: sodium in the range of 10: 0-10: 4, soil, seedling culture soil, rock The pH of at least one of soil, seedling culture soil, and rock wool is 4.0 to 7.0 after treating at least one of the wools, (1) to (4), Rice soil disease control method.

  (6) At least one of an aqueous solution containing acetic acid as an active ingredient but not containing sodium or containing an acetic acid: sodium molar ratio of 10: 4 or less before sowing, before covering, and during seedling A method for controlling rice soil diseases (eg, rice seedling blight) characterized by irrigating a rice seedling culture medium (or admixing treatment with a seedling culture medium) at a time.

  (7) Chemical pesticides (such as benomyl) if necessary as a soil disease control agent for rice having acetic acid as an active ingredient (main component), but a molar ratio of acetic acid: sodium in the range of 10: 0 to 10: 4 ) And / or a soil disease control agent for rice containing natural sterilizing and insecticidal components (such as kasugamycin), which is treated on the rice seedling culture medium (for example, irrigation treatment or mixing treatment with the seedling culture medium) A soil disease control agent for treating a seedling culture of rice, characterized by being capable of controlling a soil infectious disease (for example, rice seedling blight), or for controlling the disease.

(8) A rice soil disease control agent for rice which contains acetic acid as an active ingredient but does not contain sodium or an acetic acid: sodium molar ratio of 10: 4 or less. A soil disease control agent for rice, which can control soil-borne rice seedling blight by treating with.
(9) The soil disease control agent for rice according to (7) or (8), wherein the rice seedling blight is caused by Psium, Fusarium, Trichoderma or Rhizopus.
(10) The concentration of acetic acid is 0.02% (w / v) to 1.4% (w / v), preferably 0.04% (w / v) to 0.70% (w / v). The soil disease control agent for rice according to any one of (7) to (9) diluted with water as described above.

  Since the present invention uses a natural product called acetic acid, which is used for foods, there is no concern about safety. Moreover, the present invention has been successfully developed for the first time by irrigating rice seedling culture medium (soil), unlike the conventional method of directly treating seed rice with acetic acid. It is possible to irrigate the soil with acetic acid, which has been used at a low concentration to cause phytotoxicity, and as a result, rice seedling withering has been difficult to control without causing phytotoxicity to rice. For the first time, it has succeeded in efficiently controlling soil diseases such as diseases.

  As described above, the present invention has one major feature in the application method, usage method, and application method. Therefore, according to the method of use of the present invention, it is possible to obtain a high control effect comparable to control by conventional chemically synthesized agricultural chemicals without causing phytotoxicity to rice. Therefore, the control agent of the present invention can be used in place of the chemically synthesized pesticide, and is an excellent invention that can be adapted to social needs to reduce the use of the chemically synthesized pesticide.

  Acetic acid used as an active ingredient of the control agent according to the present invention can be used as a food or a food additive, has no toxicity and is excellent in safety.

  Acetic acid that can be used in the present invention includes pure acetic acid diluted with water, brewed vinegar, high-concentrated vinegar with higher acetic acid concentration than ordinary vinegar, and powdered vinegar diluted with water . These are commercially available, and for example, grain vinegar, special vinegar, high-concentration brewing vinegar, powdered vinegar (a mixture of acetic acid and dextrin, etc.) can be used. Fruit vinegar such as wine vinegar and apple vinegar can also be used. In addition, as acetic acid, the substance which produces | generates an acetic acid when it makes it aqueous solution can also be used, for example, acetate salts, such as potassium salt, magnesium salt, calcium salt, and iron salt, can be used.

  Therefore, the active ingredient or main component of the rice soil disease control agent according to the present invention includes acetic acid itself, acetic acid not forming sodium salt, or acetic acid but not sodium or acetic acid: sodium. It can be said that it is at least one of the components which contain only the quantity of 10: 4 or less (for example, 10: 3 is included). Therefore, when the acetic acid: sodium molar ratio is within the above range, the case where acetic acid and sodium contained in the preparation are combined to form sodium acetate after the preparation is included in the present invention. Similarly, if the molar ratio is within the above range, for example, when vinegar is used as the active ingredient, sodium chloride that happens to be contained in a small amount or sodium salt that is added in a small amount reacts with acetic acid after the preparation to give sodium acetate. Even when formed, it is included in the present invention, and even if it is formulated with a pesticide containing sodium acetate or a pesticide containing sodium, it is within the above molar ratio range. Is included. In the present application, acetic acid includes acetate ions. Similarly, sodium in the present application includes sodium ions.

  Next, a method for using the control agent of the present invention will be described. Usually, rice is sown in a seedling box filled with seedling soil, sown directly on a seedbed, or sown in various seedling culture media (such as rock wool) other than soil, and then nurtured. The control agent of the present invention significantly reduces the number of diseased seedlings by irrigating the seedling culture medium before sowing, before covering, or at the seedling raising period in this work, and exhibits an excellent controlling effect. . The most suitable time for the treatment is before soil covering at the time of sowing.

  The amount of the control agent of the present invention is appropriately selected according to the type of seedling culture medium, the seedling environment, the type of disease to be applied, the desired control effect, etc. Acetic acid concentration of 0.02 to 1.4%, preferably 0.04 to 0.70%, more preferably 0.08 to 0.35%, the inner dimensions are 58 cm long × 28 cm wide, 3 cm deep Irrigating at the time of sowing with a liquid amount of 0.1 to 1.0 L, preferably 0.25 to 1.0 L, more preferably 0.5 to 1.0 L in the amount of the seedling medium to be filled in the seedling box Shows a sufficient control effect. Usually, the pH of the seedling culture medium after the treatment with the control agent of the present invention is 4.0 to 7.0. In addition, in this invention, since the control agent should just exist in the raising seedling culture body, the mixing process which mixes a raising seedling culture medium and a control agent other than the irrigation process is also possible. Examples of the mixing treatment include total mixing, covering soil mixing, and floor soil mixing.

  Moreover, the control agent of this invention can also be used as another disease control agent and / or insect control agent, a mixture with a fertilizer, or a mixed preparation. Examples of the partner for mixed or mixed preparations include benomyl, thiophanate methyl, TMTD, prochloraz, pefrazoate, triflumizole, TPN, hydroxyisoxazole, metalaxyl, mepronil, tolcrofosmethyl, fipronil, imidacloprid, dinotefuran and various biological pesticides ( For example, Eco Hope and Eco Shot (Tricoderma Atrobilide and Bacillus subtilis brands; all manufactured by Kumiai Chemical Industry Co., Ltd.) and other natural products (Kasugamycin, Spinosad, Hinokitiol, Allyl isothiocyanate, Menthol, BT agent Furthermore, the control agent of the present invention may be used as a preparation to which a surfactant, a dispersant, a carrier, and other auxiliary agents are added, if necessary.

  The control agent according to the present invention is not only applied to the seedling culture medium that may be contaminated with the pathogenic bacteria as described above, but also applied when there is a risk of being infected with the pathogenic bacteria or to prevent it. can do. At that time, since the control agent of the present invention does not cause phytotoxicity to rice, there is no problem even if it is used prophylactically. That is, the control agent according to the present invention has a remarkable effect that it can prevent and / or treat soil diseases such as rice seedling blight.

  EXAMPLES Hereinafter, although an Example demonstrates this invention concretely, this invention is not limited by these Examples.

(Example 1) Rice seedling blight control by irrigation treatment at the time of sowing of high-concentration brewed vinegar A healthy rice seed culm (Koshihikari) is subjected to a seeding treatment at 15 ° C for 5 days, and then a germination treatment at 30 ° C. went. A contaminated soil was prepared by mixing rice seedling blight fungus (Pisium graminicola Pythium graminicola) and soil (Ube soil) = 1: 300 previously cultured in a bran medium. A seedling box having an internal dimension of 58 cm long × 28 cm wide and 3 cm deep was filled with 2 cm of contaminated culture soil, and seedlings that had undergone germination were seeded thereon. Thereafter, a 100-fold diluted solution of high-concentration brewed vinegar (acetic acid degree 16.3%) was irrigated to 500 ml / box. After covering with contaminated soil, budding treatment was performed at 30 ° C. in the dark, and greening and raising seedlings were performed in a glass greenhouse. Three weeks after sowing, all seedlings were investigated according to the degree of disease, and the disease severity and control value were calculated by the following formula. The results are shown in Table 1.

  In addition, as a high concentration brewing vinegar, the high concentration brewing vinegar (MHV-S: acetic acid degree 16.3%) made from Mitsukanna Kanos Co., Ltd. was used.

<Disease index>
Disease severity = Σ (index × number of diseased seedlings by degree) / (3 × number of surveyed seedlings) × 100
<index>
0: Healthy seedling 1: Uneven root growth 2: Overall suppression of root growth 3: Significant root abnormalities (control value)
Control value = (morbidity of untreated area−morbidity of treated area) / morbidity of untreated area × 100

(Example 2) Control of rice seedling blight by irrigation treatment at the time of sowing of a powdered vinegar preparation Seeds were seeded in the same manner as in Example 1, and then 500 ml of a 100-fold diluted solution of powdered vinegar (acetic acid degree 14.6%) / Irrigated to form a box. After covering with contaminated soil, budding treatment was performed at 30 ° C. in the dark, and greening and raising seedlings were performed in a glass greenhouse. Three weeks after sowing, all seedlings were examined according to the degree of disease occurrence, and the disease incidence and control value were calculated. The results are shown in Table 1.

  As powdered vinegar, powdered vinegar (FPV: degree of acetic acid 14.6%) manufactured by Mitsukanakanos Co., Ltd. was used.

(Example 3) Control of rice seedling blight by irrigation during seeding of cereal vinegar Seeds were sown in the same manner as in Example 1, and then a 25-fold diluted solution of cereal vinegar (acetic acid degree 4.4%) was 500 ml / Irrigation was performed to form a box. Germination treatment was performed at 30 ° C. in the dark, and greening and raising seedlings were performed in a glass greenhouse. Three weeks after sowing, all seedlings were examined according to the degree of disease occurrence, and the disease incidence and control value were calculated. The results are shown in Table 1.

  As the grain vinegar, grain vinegar (acetic acid degree 4.4%) manufactured by Mitsukanakanos Co., Ltd. was used.

(Comparative Example 1) Control of rice seedling blight by irrigation treatment at the time of sowing of Tachigalace solution Seeds were seeded in the same manner as in Example 1, and then a commercially available Tachigalace solution 500-fold diluted solution was made 500 ml / box as a comparative agent. Irrigated. Germination treatment was performed at 30 ° C. in the dark, and greening and raising seedlings were performed in a glass greenhouse. Three weeks after sowing, all seedlings were examined according to the degree of disease occurrence, and the disease incidence and control value were calculated. The results are shown in Table 1. As a Tachigarace solution, a mixed solution (light brown clear water-soluble liquid) of 30% hydroxyisoxazole and 4% metalaxyl manufactured by Sankyo Agro Co., Ltd. was used.

  As shown in Table 1, powdered vinegar, high-concentration brewed vinegar, and cereal vinegar each showed a high control effect comparable to that of Tachigalace solution against rice seedling blight caused by Pythium spp.

(Example 4) Control of rice seedling blight at various acetic acid concentrations Seed rice seeds were sown in the same manner as in Example 1, and then a 20-fold diluted solution of high-concentration brewed vinegar (acetic acid degree 16.3%), 50-fold diluted The solution, 100-fold diluted solution, 200-fold diluted solution, and 500-fold diluted solution were each irrigated to 500 ml / box. Germination treatment was performed at 30 ° C. in the dark, and greening and raising seedlings were performed in a glass greenhouse. Three weeks after sowing, all seedlings in each section were examined according to the degree of disease occurrence, and the disease incidence and control value were calculated. The results are shown in Table 2.

(Comparative Example 2) Rice seedling blight prevention by irrigation treatment at the time of sowing of Tachigalace solution Seeds were seeded in the same manner as in Example 1, and thereafter, irrigated with a 500-fold diluted solution of Tachigalace solution as a comparison agent to 500 ml / box. Processed. Germination treatment was performed at 30 ° C. in the dark, and greening and raising seedlings were performed in a glass greenhouse. Three weeks after sowing, all seedlings were examined according to the degree of disease occurrence, and the disease incidence and control value were calculated. The results are shown in Table 2.

  As shown in Table 2, 20-fold diluted solution, 50-fold diluted solution, and 100-fold diluted solution of high-concentration brewed vinegar are as high as Tachigalace solution against rice seedling blight fungus by Pythium spp. Showed the effect.

(Example 5) Effect on germination of rice at various acetic acid concentrations Seed pods were sown in the same manner as in Example 1 except that a soil not mixed with rice seedling blight fungus (Ube soil) was used. Powdered vinegar (acetic acid degree 14.6%) 33-fold diluted solution, 50-fold diluted solution, and 100-fold diluted solution were irrigated to 500 ml / box. After budding treatment at 30 ° C. in the dark, greening and raising seedlings were performed in a glass greenhouse. Seven days after sowing, the number of budding seedlings was investigated for all seedlings in each section, and the budding seedling rate was calculated by the following formula. The results are shown in Table 3.

<Sprouting seedling rate>
Germination seedling rate (%) = number of budding seedlings in powdered vinegar-treated section / number of budding seedlings in untreated section × 100 (%)

  The present invention has a high control effect on soil diseases of rice, which is difficult to control, does not cause environmental pollution, and does not cause phytotoxicity in rice. It was made for the purpose of providing a disease control agent. As a result of intensive research, they have completed a rice soil disease control agent containing acetic acid as a main component. According to the present invention, as described above, conventional control is performed without causing phytotoxicity to rice by irrigating the soil with higher concentration of acetic acid that has been conventionally used at low concentration to cause phytotoxicity to plants. It is possible to effectively control soil diseases (for example, rice seedling blight) that have been difficult to control.

Claims (10)

  A soil disease control agent for rice which contains acetic acid as an active ingredient but has a molar ratio of acetic acid: sodium in the range of 10: 0 to 10: 4 is applied at least one before sowing, before covering, and during seedling period. A method for controlling soil diseases of rice, characterized by irrigating a rice seedling culture medium at a time.   The rice soil disease control method according to claim 1, wherein the rice soil disease is a rice seedling blight caused by a microorganism belonging to at least one of Psium, Fusarium, Trichoderma, and Rhizopus.   A soil disease control agent for rice containing acetic acid as an active ingredient but having a molar ratio of acetic acid: sodium in the range of 10: 0 to 10: 4 is irrigated in the form of an aqueous solution. A method for controlling soil diseases of rice according to claim 1 or 2.   The method for controlling rice soil diseases according to any one of claims 1 to 3, wherein the rice seedling culture medium is at least one selected from seedling culture soil, rock wool, and paddy soil.   Acetic acid is contained as an active ingredient, but the soil disease control agent for rice having a molar ratio of acetic acid: sodium in the range of 10: 0 to 10: 4 is treated with soil, seedling culture soil, rock wool, The method for controlling soil diseases of rice according to any one of claims 1 to 4, wherein the pH of the seedling culture soil and rock wool is 4.0 to 7.0.   An aqueous solution containing acetic acid as an active ingredient but not containing sodium or containing only an amount of acetic acid: sodium molar ratio of 10: 4 or less is at least one time before sowing, before covering, and during the raising period. A method for controlling soil diseases in rice, comprising irrigating rice seedling cultures.   A soil disease control agent for rice which contains acetic acid as an active ingredient but has a molar ratio of acetic acid: sodium in the range of 10: 0 to 10: 4. A soil disease control agent for treating seedling cultures of rice, characterized in that it can control infectious rice seedling blight.   A soil disease control agent for rice containing acetic acid as an active ingredient but not containing sodium or an amount of acetic acid: sodium molar ratio of 10: 4 or less, which is treated on rice seedling cultures A soil disease control agent for rice that can control soil-borne rice seedling blight.   The rice soil disease control agent according to claim 7 or 8, wherein rice seedling blight is caused by Psium, Fusarium, Trichoderma or Rhizopus.   The soil disease for rice according to any one of claims 7 to 9, diluted with water so that the concentration of acetic acid is 0.02% (w / v) to 1.4% (w / v). Control agent.