Bactericidal composition and bactericide for resisting plant diseases

Abstract

The invention belongs to the technical field of pesticide bactericides, and particularly relates to a bactericidal composition for resisting plant diseases and a bactericide. The invention relates to a bactericidal composition capable of resisting plant diseases. The bactericidal composition capable of resisting plant diseases is prepared by compounding 1-(2-hydroxyphenyl)-1-(1-hydroxyphenyl)-1-(1-hydroxyphenyl)-1-(1-hydroxyphenyl)-1-(1-hydroxyphenyl)-1-(1- The mass ratio of the 1-(2-hydroxyphenyl)-1-butanone to the farnesol is (1-12): (4-1); the mass ratio of the 1-(2-hydroxyphenyl)-1-butanone to the sedaxane is (1-30): (40-1). According to the bactericidal composition disclosed by the invention, the 1-(2-hydroxyphenyl)-1-(1-hydroxyphenyl)-1-(1-hydroxyphenyl)-1-(1-hydroxyphenyl)-1-(1-hydroxyphenyl)-1-(1-hydroxyphenyl)-1-(1-hydroxyphenyl)-1-(1-hydroxyphenyl)-1-(1-hydroxyphenyl)-1-(1-hydroxyphenyl)-1-(1-hydroxyphenyl)-1 Meanwhile, the bactericidal composition contains two bactericidal active components, so that the generation and development of drug resistance of pathogenic bacteria can be delayed to a certain extent, the problem of drug resistance is solved, and support can be provided for developing a new medicament for preventing and treating plant diseases.

Description

Technical Field

[0001] The invention belongs to the technical field of pesticide fungicides, and in particular relates to a fungicide composition and a fungicide for resisting plant diseases. Background Art

[0002] In the process of crop production, pesticides are often used to control plant diseases. However, due to the long-term abuse of existing agents, pathogens have developed different degrees of resistance to them, resulting in reduced control effects of existing agents on plant diseases. As resistance increases, the control effect is also decreasing year by year. Therefore, it is particularly important to screen compound fungicidal compositions for controlling plant diseases.

[0003] Fenclofenone, CAS: 2887-61-8, chemical name: 1-o-hydroxyphenylbutanone, structural formula is as follows:

[0004]

[0005] It has been disclosed in the prior art that fenoxadone can be used to prevent and treat a variety of plant fungal diseases. For example, the patent with the authorization announcement number CN1111149C discloses the use of a mixture of 1-o-hydroxyphenyl butanone (i.e. fenoxadone) and 1-p-hydroxyphenyl butanone. In its specification, it is disclosed that fenoxadone has strong bactericidal and antibacterial effects in crops, especially against apple rot, apple dry rot, apple ring rot, tomato gray mold, vegetable early blight, corn leaf spot, and cotton wilt. In addition, it is also disclosed in the prior art that fenoxadone can be compounded with other agents to improve the control effect of plant diseases.

[0006] Farnesol, also known as farnesol, is the main component of the plant farnesol-type camphor tree Cinamomumtenuipilum Kosterm essential oil. It not only has relatively complex biological activities against a variety of arthropods, but also has the function of regulating the growth and proliferation of microorganisms such as bacteria and fungi. The patent with the authorization announcement number CN108719288B discloses the application of farnesol as a crop fungicide synergist in the prevention and control of plant gray mold. In its specification, it is disclosed that when farnesol is compounded with difenoconazole or carbendazim at a certain weight ratio, the prevention and control effect of gray mold can be improved.

[0007] Sedaxane is a pyrazole amide fungicide developed by Syngenta. As a succinate dehydrogenase inhibitor (SDHI) fungicide, it acts on the succinate dehydrogenase in pathogens, causing tricarboxylic acid cycle disorders, thereby hindering energy metabolism, inhibiting the growth of pathogens, and causing their death. Sedaxane can be used to prevent and control a variety of soil-borne and seed-borne diseases on a variety of crops, as well as early foliar diseases.

[0008] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0009] The object of the present invention is to provide a fungicide composition and a fungicide for resisting plant diseases, so as to solve the problems mentioned in the background technology.

[0010] To achieve the above object, the present invention provides the following technical solutions:

[0011] A fungicide composition for resisting plant diseases, which is prepared by compounding fenclofenone with farnesol or fluazifop; the mass ratio of fenclofenone to farnesol is 1-12:4-1; the mass ratio of fenclofenone to fluazifop is 1-30:40-1.

[0012] Furthermore, the mass ratio of fenclofenone to farnesol is 1:4.

[0013] Furthermore, the mass ratio of fenclofenac to fluazifop is 10:1.

[0014] A fungicide, which is prepared by using the anti-plant disease fungicide composition according to claim 1 as an active ingredient and supplemented with auxiliary ingredients.

[0015] Furthermore, the mass of the anti-plant disease fungicide composition accounts for 0.1-75% of the total mass of the fungicide.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention compounds fentrazone with farnesol or fluazifop-zobactam. It is found through indoor experiments that the compound combination has a synergistic effect on plant diseases such as cucumber downy mildew within a suitable mass ratio, can improve the control effect on plant diseases, and is helpful to reduce the amount of pesticides used. At the same time, because the bactericidal composition of the present invention contains two bactericidal active ingredients, it can delay the generation and development of drug resistance of pathogens to a certain extent, overcome the problem of drug resistance, and further provide support for the development of new agents for controlling plant diseases. DETAILED DESCRIPTION

[0018] The technical solution of the present invention is described clearly and completely below.

[0019] Example: Indoor biological activity test of fenthiocarb compound

[0020] 1. Test crops

[0021] "Xintai Mici" cucumber planted in pots with 6-7 true leaves

[0022] 2. Test strains

[0023] Cucumber downy mildew (Pseudoperonospora cubensis), fresh cucumber downy mildew leaves were collected in the cucumber planting field. The downy mildew sporangia on the back of the leaves were washed with sterile water and inoculated onto the back of the test crop leaves. The fresh sporangia were cultured at 19°C until a large number of fresh sporangia were produced. The fresh sporangia were washed with sterile water and prepared into 1.5×10 5 The suspension was prepared at a concentration of 100 sporangia / mL and stored at 4°C for later use.

[0024] 3. Test reagents

[0025] Fenclofenac, farnesol, fluazifop-zobactam

[0026] The original drug was first dissolved in dimethyl sulfoxide, and then diluted with a 0.1% Tween-80 aqueous solution to form a single-dose stock solution. Multiple groups of proportions were set up, and each single dose and each group of mixed proportions were set with 5 mass concentration gradients according to the equal ratio method for standby use.

[0027] 4. Test methods

[0028] The leaf disc floating method was used to determine the toxicity of single and mixed agents to cucumber downy mildew. 20 mL of the drug solution was added to a 9 cm diameter culture dish, and the treatment with an equal amount of 0.1% Tween-80 aqueous solution was used as a blank control. Fresh leaves from the test crop were picked, and leaf discs with a diameter of 1.5 cm were made. The leaf discs were floated on the solution in the culture dish with the back facing up. There were 10 leaf discs per dish, and repeated 4 times. The prepared sporangium suspension was aspirated with a pipette, and 10 μL was inoculated in the center of the back of each leaf disc. Cover the dish with a lid, place it under light conditions of 16 h / darkness and a temperature of 19 ° C for 7 days, and then the disease was graded and investigated. The disease index and prevention effect were calculated based on the survey results.

[0029]

[0030] 5. Disease classification standards

[0031] The disease level is divided according to the percentage of spore production area to the entire leaf disk area, as shown in Table 1.

[0032] Table 1 Disease grade classification standard

[0033]

[0034] 6. Data Analysis

[0035] The logarithmic value of the drug concentration and the probability value of the protective effect were regressed to calculate the EC of each drug. 50The Sun Yunpei method was used to calculate the action type synergistic effect: CTC≤80 was antagonistic effect, 80<CTC<120 was additive effect, and CTC≥120 was synergistic effect. The results are shown in Table 2-3.

[0036] Table 2 Toxicity of the combination of fenthiocarb and farnesol to cucumber downy mildew

[0037]

[0038]

[0039] It can be seen from the test results in Table 2 that the combination of fenclorac and farnesol has a synergistic effect on cucumber downy mildew, especially when the mass ratio of fenclorac to farnesol is 1:4, the synergistic effect is most significant, and other ratios all show synergistic effects to varying degrees.

[0040] Table 3 Toxicity of the combination of fenthiocarb and cypermethrin to cucumber downy mildew

[0041]

[0042] It can be seen from the test results in Table 3 that the combination of fenthion and fluazifop has a synergistic effect on cucumber downy mildew, especially when the mass ratio of fenthion to fluazifop is 10:1, the synergistic effect is most significant, and other ratios all show synergistic effects to varying degrees.

[0043] In summary, the present invention compounds fentrazone with farnesol or fluazifop-butyl, and through indoor experiments, it is found that the compound combination has a synergistic effect on plant diseases such as cucumber downy mildew within a suitable mass ratio, can improve the control effect on plant diseases, and help reduce the amount of pesticides used. At the same time, since the bactericidal composition of the present invention contains two bactericidal active ingredients, it can delay the generation and development of pathogen resistance to a certain extent, overcome the problem of drug resistance, and further provide support for the development of new agents for preventing and controlling plant diseases.

Claims

1. A fungicidal composition for resisting plant diseases, characterized in that: The anti-plant disease fungicidal composition is prepared by compounding fentrazone and farnesol or fluazifop; the mass ratio of fentrazone to farnesol is 1-12:4-1; the mass ratio of fentrazone to fluazifop is 1-30:40-1.

2. The anti-plant disease fungicidal composition according to claim 1, characterized in that: The mass ratio of fenclofenone to farnesol is 1:

4.

3. The anti-plant disease fungicidal composition according to claim 1, characterized in that: The mass ratio of fenthiocarb to fluazifop is 10:

1.

4. A bactericide, characterized in that: The fungicide is prepared by using the anti-plant disease fungicide composition according to claim 1 as an active ingredient and supplemented with auxiliary ingredients.

5. The bactericide according to claim 4, characterized in that The mass of the anti-plant disease fungicide composition accounts for 0.1-75% of the total mass of the fungicide.

Images