JPH07258005A - Antimicrobial agent for agriculture and horticulture - Google Patents

Abstract

PURPOSE:To obtain a germicide for diseases of rice, Pseudomonas solanacearum of tomato and Erwinia carotovora of cabbage and chinese cabbage by using peracetic acid known solely as the germicide having general germicidal effects as an effective ingredient. CONSTITUTION:A germicide for agriculture and horticulture containing peracetic acid as an effective ingredient prepared by dissolving, e.g. peracetic acid in water. A concentration of peracetic acid is preferably 1-6wt.%. This germicide is substantially effective for all diseases of rice which attack during the growth period of rice. Above all, it is most suitable for Fusarium roseum, Pseudomonas glumae, Pseudomonas syringae pv. panici, Gibberella fujikuroi, Cochliobolus miyabeanus, Pyricularia oryzae, etc. It is especially effective for Fusarium roseum, Pseudomonas glumae and Pseudomonas syringae pv. panici. Further, it is especially effective for Pseudomonas solanacearum of tomato and Erwinia carotovora subsp. carotovora of cabbage and chinese cabbage. This germicide expresses excellent controlling effect in both soaking and drench treatment. This germicide is effective against both bacteria and fungi and, further, exhibits excellent germicidal effect against drug resistant germs.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an agricultural and horticultural fungicide. More specifically, it relates to a fungicide for rice diseases, a fungicide for bacterial wilt of tomato, and a cabbage, a fungicide for soft rot of cabbage.

[0002]

2. Description of the Related Art Conventional diseases of rice include, for example, bacterial seedling blight of rice, bacterial wilt of rice blight, brown stripe of rice,
Rice cabbage seedling disease, rice sesame leaf blight, rice blast and the like are known to be caused by bacteria and / or filamentous fungi. In order to control these diseases, for example, triflumizole [generic name, (E) -4-chloro-α, α, α-trifluoro-N- (1-imidazol-1-yl-2 −
Propoxyethylidene) O-toluidine], benomyl [generic name, methyl-1-butylcarbamoyl-2-benzimidazolecarbamate], mixture of benomyl and thiuram [generic name, bis (dimethylthiocarbamoyl) disulfide], oxolinic acid, water Fungicides such as cupric oxide are used.

However, triflumizole and benomyl are effective against filamentous fungi, but have insufficient effects on bacteria, and in particular, they are poorly effective against drug-resistant bacteria, which has recently become a problem, and oxolinic acid is effective against bacteria. Although it is high, it has almost no effect on filamentous fungi, so that the disease control of rice cannot be sufficiently performed. In addition, the pretreatment for soaking is indispensable for all the chemicals, and the treatment time is limited. Further, oxolinic acid and cupric hydroxide are effective only when subjected to the dipping treatment, and a sufficient effect cannot be obtained even when the irrigation treatment is performed.

Therefore, it is effective against both bacteria and filamentous fungi, has an excellent bactericidal effect also against drug-resistant bacteria, the treatment time can be freely set, and a sufficient bactericidal effect can be obtained even by irrigation treatment. There is a demand for a fungicide for rice diseases that can exert its effect.

On the other hand, peracetic acid is known as an environmental germicide. This is, for example, the Antibacterial and Antifungal Handbook (198
May 25, 2006, 1 edition, 1 printing, Gihodo Publishing Co., Ltd.)
See page 447. Furthermore, on page 206 of antibacterial and antifungal agents and comfortable environment (published on October 30, 1992, 1st printing, CMC Co., Ltd.), agricultural and marine products such as hydrosphere and soil are listed as target fields of environmental disinfectants. Related environmental fields are listed. However, these prior art documents only describe peracetic acid as a bactericide having a general bactericidal effect, and do not disclose that it has a remarkably excellent effect on a specific sterilization target.

[0006]

The present inventor has conducted extensive studies to solve the above-mentioned problems of the prior art, and as a result, peracetic acid, which is known only as a germicide having a general germicidal effect, is expected. In addition, it shows a remarkably excellent control effect against diseases that occur during seedling raising of rice and specific diseases of tomato, Chinese cabbage and cabbage, and against both bacteria and filamentous fungi that cause these diseases. Is effective, has an excellent bactericidal effect against drug-resistant bacteria, and treatment other than pre-soaking treatment can be performed, so the treatment time can be freely set,
It has been found that not only the immersion treatment but also the irrigation treatment can exert a sufficient bactericidal effect. The present invention has been completed based on these findings.

That is, the present invention provides (1) a rice paddy disinfectant containing peracetic acid as an active ingredient, (2) a tomato wilt disinfectant containing peracetic acid as an active ingredient, and (3) peracetic acid. It relates to a fungicide for soft rot of cabbage and cabbage as an active ingredient.

The agricultural and horticultural germicide of the present invention is usually used in the form of an aqueous solution.

The bactericide of the present invention is prepared, for example, by dissolving peracetic acid in water. The concentration of peracetic acid can be appropriately selected from a wide range depending on the application object and application time, but is usually about 1 to 6% by weight.

When used, the aqueous solution of the bactericide of the present invention may be further diluted with water or the like, if necessary.

When applying the disinfectant of the present invention to rice, dipping treatment and irrigation treatment can be carried out. The dipping treatment is carried out, for example, by diluting the bactericidal agent of the present invention prepared above with water so that the concentration of peracetic acid is usually about 50 to 4000 ppm,
The concentration is preferably about 100 to 2000 ppm, and the rice seed before soaking, before germination or after germination is immersed in this diluted solution for usually 10 minutes or longer, preferably for 10 minutes to 48 hours. For the irrigation treatment, for example, the concentration of peracetic acid is usually adjusted to 2 by diluting the bactericide of the present invention prepared above with water.
5 to 400 ppm, preferably 50 to 200 ppm
This dilution is usually 0.5 to 15 liters / m
^It is carried out by spraying on the soil at a rate of about ² , preferably about 1 to 10 liters / m ² . On the other hand, when the fungicide of the present invention is applied to tomatoes, Chinese cabbage and cabbage, it is preferable to carry out irrigation treatment. The processing can be performed in the same manner as in rice.

The bactericide of the present invention is effective against virtually all rice diseases occurring during seedling raising, among which, among them, bacterial seedling blight of rice, bacterial wilt of rice blight, and brown stripe of rice. ,
It is effective against rice scab seedling disease, rice sesame leaf blight, rice blast, etc. Among them, it is particularly effective against rice seedling bacterial blight, rice blight bacterial disease, rice brown streak and the like. Furthermore, the fungicide of the present invention is particularly effective against bacterial wilt of tomatoes and Chinese cabbage and soft rot of cabbage.

[0013]

INDUSTRIAL APPLICABILITY The fungicide of the present invention has a particularly excellent control effect against diseases occurring during rice seedling raising and specific diseases of tomato, Chinese cabbage and cabbage, and the bacteria causing these diseases. It is effective against both bacteria and filamentous fungi, has an excellent bactericidal effect against drug-resistant bacteria, and can perform treatments other than pre-soaking treatment, so the treatment time can be set freely and further A sufficient bactericidal effect can be exhibited even by treatment. In addition, the bactericide of the present invention also has the property of exhibiting a sufficient bactericidal effect even when the treatment time is short, as compared with conventional commercially available bactericides.

[0014]

EXAMPLES The present invention will be further clarified by the following examples.

Example 1 Test for Controlling Rice Seedling Bacterial Disease Control Peracetic acid was dissolved in water to prepare the fungicide of the present invention having a peracetic acid concentration of 1%. 20 ml of a solution prepared by diluting the bactericide with water
It was put in a beaker with a volume of 00 ml, and 10 g of rice paddy contaminated with rice seedling killing bacteria was immersed in the beaker to examine the control effect. Rice seeds were used before soaking, before germination and after germination. Immersion was carried out at 20 ° C. for 3 days, and germination was carried out at 32 ° C. for 1 day. The germinated paddy was sown in a 12 × 12 cm plastic case, kept at 32 ° C. for 2 days, and then managed in a greenhouse. Three weeks after sowing, the number of diseased seedlings was investigated, and the control value was calculated according to the following formula. The results are shown in Table 1. For comparison, coside bordeaux (trade name, copper wettable powder) and stanna (trade name, oxolic acid wettable powder) containing cupric hydroxide as an active ingredient were used. The results are also shown in Table 1.

[0016]

[Equation 1]

[0017]

[Table 1]

Example 2 Test for Controlling Bacterial Blight Disease of Rice The test was conducted in the same manner as in Example 1 except that rice hulls contaminated with rice blight bacteria were used. The results are shown in Table 2.

[0019]

[Table 2]

Example 3 Test for Controlling Rice Basking Seedling Disease Resistant to Benzimidazole-Based Drugs Rice paddy contaminated with rice bacillus seedling disease resistant to benzimidazole-based drugs is used, and 4 weeks after sowing, diseased seedlings are used. The test was conducted in the same manner as in Example 1 except that the number was investigated. For comparison, a similar test was performed using Benlate T (trade name) containing benomyl and thiuram as active ingredients. The results are shown in Table 3.

[0021]

[Table 3]

Example 4 Effect of controlling bacterial wilt of tomato bacterial wilt Soil contaminated with bacterial wilt of tomato is packed in a pot with a diameter of 9 cm, and a part of the root of a tomato seedling (real leaf four-leaf machine) 23 days after sowing is scissored. Immediately after cutting and transplanting, a solution prepared by diluting the same fungicide as in Example 1 with water was irrigated. 13 days after transplantation, the number of diseased strains was investigated, and the control value was calculated. The results are shown in Table 4. For comparison, the same test was performed using a stanna (trade name, oxolic acid wettable powder). The results are shown in Table 4.

[0023]

[Table 4]

It can be seen from Tables 1 to 4 that the fungicide of the present invention has an excellent controlling effect against specific diseases of rice and tomato in both cases of the immersion treatment and the irrigation treatment.

Claims (5)

[Claims] 1. A fungicide for rice diseases, which comprises peracetic acid as an active ingredient. 2. The fungicide according to claim 1, wherein the rice disease is a disease that occurs during the rice seedling raising period. 3. The fungicide according to claim 1, which is a bacterial seedling blight of rice, a bacterial bacterial wilt of rice, a brown streak of rice, a rice seedling blight, rice sesame leaf blight, or rice blast. 4. A fungicide for tomato wilt disease, which comprises peracetic acid as an active ingredient. 5. A fungicide for soft rot of Chinese cabbage and cabbage, which contains peracetic acid as an active ingredient.