CN113951273B - Bactericidal composition for preventing and treating southern blight - Google Patents
Bactericidal composition for preventing and treating southern blight Download PDFInfo
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- CN113951273B CN113951273B CN202110954023.6A CN202110954023A CN113951273B CN 113951273 B CN113951273 B CN 113951273B CN 202110954023 A CN202110954023 A CN 202110954023A CN 113951273 B CN113951273 B CN 113951273B
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- prochloraz
- bactericidal composition
- isopyrazam
- southern blight
- tetramycin
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N47/00—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom not being member of a ring and having no bond to a carbon or hydrogen atom, e.g. derivatives of carbonic acid
- A01N47/08—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom not being member of a ring and having no bond to a carbon or hydrogen atom, e.g. derivatives of carbonic acid the carbon atom having one or more single bonds to nitrogen atoms
- A01N47/28—Ureas or thioureas containing the groups >N—CO—N< or >N—CS—N<
- A01N47/38—Ureas or thioureas containing the groups >N—CO—N< or >N—CS—N< containing the group >N—CO—N< where at least one nitrogen atom is part of a heterocyclic ring; Thio analogues thereof
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N43/00—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds
- A01N43/48—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with two nitrogen atoms as the only ring hetero atoms
- A01N43/56—1,2-Diazoles; Hydrogenated 1,2-diazoles
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N43/00—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds
- A01N43/90—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having two or more relevant hetero rings, condensed among themselves or with a common carbocyclic ring system
Abstract
The invention relates to a bactericidal composition for preventing and treating southern blight, which comprises the effective components of prochloraz and isopyrazam or tetramycin. The mass ratio of the prochloraz to the isopyrazam or the tetramycin is 1:20-20: 1. The research shows that the medicament has obvious synergistic effect under the compound dosage of 1:20-20: 1. Therefore, through research, it was found that: the tetramycin/isopyrazam and prochloraz can be used for preventing and treating southern blight of peanuts. The popularization and the application of the compound preparation have important significance on the comprehensive management of the peanut southern blight.
Description
Technical Field
The invention belongs to the technical field of sterilization compositions, and particularly relates to a sterilization composition which comprises prochloraz and isopyrazam or tetramycin as effective components and is used for preventing and treating southern blight.
Background
Southern blight is a fungal soil-borne disease caused by sclerotium rolfsii, and can damage over 500 kinds of plants, such as peanuts, soybeans, sesame, and the like. In recent years, with the increasing of peanut planting area, the harm of southern blight in peanut fields is increased year by year due to continuous cropping, and the yield loss of peanuts is generally 5% -80%. Due to the lack of resistant varieties of peanuts, chemical agents are mainly relied on for control at present. However, at present, few registered medicaments for preventing and treating peanut southern blight are used in China, so that the occurrence of drug resistance of germs is inevitable due to frequent use of a single medicament for a long time, and the prevention and treatment difficulty is increased. In addition, frequent application of the drug can cause serious damage to the environment. Therefore, there is an urgent need to screen highly effective and low toxic drugs or drug combinations.
Prochloraz is an imidazole bactericide, and mainly inhibits the biosynthesis of sterol to play a role in bactericidal activity. The bactericide has good systemic property, quick action and effective period, and has good therapeutic and eradicating effects. Prochloraz is a broad-spectrum bactericide and can be used for preventing and treating various crop diseases caused by ascomycetes and adelomycetes, and at present, the medicaments are registered to be used for preventing and treating citrus anthracnose, green mold, penicilliosis, wheat scab, potato early blight, banana scab, rice bakanae disease and other diseases. At present, no research report on the prevention and treatment of southern blight is found.
The pyrazolonaphthalein is a novel succinate dehydrogenase inhibitor developed by Zhangda, has an action target of succinate dehydrogenase in mitochondria, and inhibits the generation of pathogenic energy to cause the death of pathogenic bacteria. Can be used for preventing and treating powdery mildew of cucumber, apple ring spot, banana leaf spot and cowpea rust at present. In addition, the agent has low toxicity and is safe for non-target organisms. The bactericide has been widely noted at present, but the bactericide has a single action target and has been evaluated as a medium and high resistance risk level by the bactericide resistance action committee (FRAC). Therefore, the development of a compound preparation of the isopyrazam has become a research hotspot.
Tetramycin (orthotetramycin) is a novel agricultural antibiotic, and is a fermentation metabolite of streptomyces ahygroscopicus paraspora subspecies. The pesticide has high bactericidal activity, wide bactericidal spectrum and safety to non-target organisms, and can be used for preventing and treating 26 known pathogenic fungi such as fungi of deuteromycotina, ascomycetes, flagellates and the like. At present, the pesticide is registered for preventing and treating diseases such as peanut root rot, rice false smut, banded sclerotial blight, damping off, wheat powdery mildew, gibberellic disease, corn head smut and the like. However, no report is found in the current research of tetramycin for preventing and treating southern blight.
At present, most registered medicaments are single-action targets, and the diseases are easy to generate drug resistance after frequent use. Therefore, in the actual production, most effective medicaments need to be compounded or alternately used with medicaments with different action mechanisms, the bactericidal spectrum can be increased, and the application frequency can be reduced, so that the development of disease resistance is delayed, and the environmental pollution is reduced. In view of prolonging the service life of the medicament and reducing the pollution to the environment, the application explores the feasibility of compounding the bactericide prochloraz and the isopyrazam or tetramycin.
Disclosure of Invention
In order to make up for the defects of the prior art, the invention aims to provide the bactericidal composition with good control effect and long duration, the active ingredients of the bactericidal composition comprise prochloraz and isopyrazam or tetramycin, and the bactericidal composition is used for effectively controlling southern blight.
In order to achieve the purpose, the invention adopts the following technical scheme:
a bactericidal composition for preventing and treating southern blight contains prochloraz and isopyrazam or tetramycin as effective components.
Further, in the bactericidal composition for preventing and treating southern blight, the mass ratio of prochloraz to isopyrazam or tetramycin is 1:20-20: 1.
Further preferably, the mass ratio of the prochloraz to the isopyrazam is 1: 5.
Further preferably, the mass ratio of the prochloraz to the tetramycin is 1: 10-20.
Furthermore, the bactericidal composition can be prepared into different application preparations according to the conventional technology in the field, and the appropriate dosage forms comprise suspending agents, water dispersible granules, wettable powder, granules, aqueous emulsion, missible oil or microcapsules and the like.
When the bactericidal composition for preventing and treating southern blight is prepared into a suspending agent, the weight percentages of the raw materials are as follows: 5% of isopyrazam, 1% of prochloraz, 3% of sodium lignosulfonate, 3% of polycarboxylate, 1% of alkylphenol polyoxyethylene, 0.2% of xanthan gum, 1% of magnesium aluminum silicate, 2% of ethylene glycol, 0.3% of organic silicon defoamer, 0.1% of sodium benzoate and the balance of deionized water.
When the bactericidal composition for preventing and treating southern blight is prepared into wettable powder, the weight percentages of the raw materials are as follows: 5% of isopyrazam, 1% of prochloraz, 1% of sodium dodecyl sulfate, 6% of calcium lignosulphonate, 2% of nekal and the balance of kaolin.
When the bactericidal composition for preventing and treating southern blight is prepared into water dispersible granules, the weight percentages of the raw materials are as follows: 5% of isopyrazam, 1% of prochloraz, 10% of calcium lignosulfonate, 5% of sodium dodecyl benzene sulfonate, 5% of ammonium sulfate, 0.1% of polyethylene glycol and the balance of kaolin.
When the bactericidal composition for preventing and treating southern blight is prepared into water dispersible granules, the weight percentages of the raw materials are as follows: 1-20% of tetramycin, 1-10% of prochloraz, 10% of sodium lignin sulfonate, 5% of sodium dodecyl benzene sulfonate, 5% of sodium chloride, 3% of polyethylene glycol and the balance of kaolin.
Compared with the prior art, the invention has the following advantages:
1) the prochloraz and the isopyrazam or the tetramycin have obvious synergistic action in a certain proportion range, the toxicity activity and the prevention and treatment effect of the composition are better than those of a single agent, the dosage and the frequency of the medicament can be greatly reduced, the medication cost is reduced, and the adverse effect on the ecological environment is reduced;
2) prochloraz and isopyrazam or tetramycin belong to bactericides with different action mechanisms, the defect that resistance is generated by using a single medicament can be overcome by compounding two bactericides, the service lives of the two bactericides are prolonged, and the prochloraz and the isopyrazam or tetramycin have important significance for scientific management of cotton blight;
3) the prochloraz and isopyrazam or tetramycin compound preparation has the advantages of good control effect, long lasting period, time and labor saving in use, and great social benefit and economic benefit can be generated by popularization of the compound preparation.
Detailed Description
The technical solution of the present invention is further described in detail with reference to the following examples, but the scope of the present invention is not limited thereto.
The experimental procedures used in the following examples are all conventional procedures unless otherwise specified.
Materials, reagents and the like used in the following examples are commercially available unless otherwise specified.
The bactericide with different action mechanisms is mixed and used, and generally shows three actions: antagonism, additive action and synergism, wherein the compounding synergism is an important means for comprehensive control, but what effect is shown after the medicament is compounded is usually proved by a large number of tests.
Example 1
The bactericidal composition takes the isopyrazam or the tetramycin and the prochloraz as effective components, and has obvious synergistic effect on the southern blight of the peanut; rather than simply adding the two drugs, particularly indoor bioassays using combined virulence.
Reagent to be tested: 92% isopyrazam technical, 98% prochloraz technical and 15% tetramycin mother liquor.
Test subjects: southern blight of peanut (Sclerotium rolfsii）。
Preparing a medicament: the original medicine is prepared into the required test medicament by a conventional method.
Indoor bioassay tests are carried out according to 'pesticide indoor bioassay test standard bactericide', indoor toxicity of different proportions to southern blight germs is measured by adopting a hypha growth rate method, the diameter of a bacterial colony is measured by a cross method after 3 d, and net growth amount and hypha growth inhibition rate of each treatment are calculated.
Inhibition (%) = (control colony diameter-treated colony diameter) × 100/(control colony diameter-5);
adopting DPSv7.5 software to process data and calculate EC of each kind of processing50A value of, and EC50The cotoxicity coefficient is calculated according to the Sun cloud Peel method, and the calculation formula is as follows:
co-toxicity coefficient (CTC) = [ (1/EC)50M)/(PA/ EC50A + PB/ EC50B +…)]×100
A. B … is single agent, and M is mixed agent. EC (EC)50AFor moderate inhibition of A agent, EC50BFor moderate inhibition of B-agent, EC50MThe inhibiting medium concentration of the mixed medicament, P is the percentage content of the effective component, and the co-toxicity coefficient of the mixed medicament is CTC. The co-toxicity coefficient (CTC) is more than or equal to 120 and is shown as synergistic effect, the CTC is more than 80 and less than 120 and is shown as additive effect, and the CTC is less than or equal to 80 is shown as antagonistic.
The isopyrazam/tetramycin and the prochloraz are compounded according to different mass ratios respectively, and the indoor toxicity to the southern blight is measured, and the results are shown in the following tables 1 and 2.
TABLE 1 indoor toxicity to southern blight after compounding isopyrazam and prochloraz in different mass ratios
As can be seen from Table 1, the EC of isopyrazam and prochloraz against southern blight of peanut50The values were 0.97 mg/L and 8.43 mg/L, respectively. The compound mass ratio of the isopyrazam to the prochloraz is within the range of 1:20-20:1, and the cotoxicity coefficients are all larger than 120, which shows that the compound ratio of the isopyrazam to the prochloraz has a synergistic effect within the range of 1:20-20:1, and particularly the combined toxicity of the isopyrazam to the prochloraz is highest when the ratio of the isopyrazam to the prochloraz is 5: 1.
TABLE 2 indoor toxicity to southern blight of peanut after compounding tetramycin and prochloraz in different mass ratios
As can be seen from Table 2, tetramycin and prochloraz all have good inhibitory activity on southern blight of peanut, have synergistic effect in different compounding ratios within the range of 1:20-20:1, and particularly have cotoxicity coefficients reaching 351.02 and 328.63 respectively under the conditions that the tetramycin and the prochloraz are in the ratios of 20:1 and 10:1, so that the combined toxicity is highest, and the synergy is most obvious.
Example 2: 5% isopyrazam and 1% prochloraz suspending agent
In this embodiment, the mass percentages of the components are as follows: 5% of isopyrazam, 1% of prochloraz, 3% of sodium lignosulfonate (dispersing agent), 3% of polycarboxylate (dispersing agent, Guangyuan Yinong, product model GY-D09), 1% of alkylphenol polyoxyethylene ether (wetting agent), 0.2% of xanthan gum (thickening agent), 1% of magnesium aluminum silicate (thickening agent), 2% of ethylene glycol (anti-freezing agent), 0.3% of organic silicon defoaming agent, 0.1% of sodium benzoate (preservative) and the balance of deionized water to 100%.
The components are mixed according to the proportion of the formula, and are sheared at a high speed of 10000 r/min for 5min, and are ground to the required particle size by a sand mill, so as to prepare the 5 percent pyrazolonaphthalein and 1 percent prochloraz suspending agent.
Example 3: 5% isopyrazam and 1% prochloraz wettable powder
5% of isopyrazam, 1% of prochloraz, 1% of sodium dodecyl sulfate (wetting agent), 6% of calcium lignosulfonate (dispersing agent), 2% of nekal (dispersing agent) and the balance of kaolin to 100%.
The components are uniformly mixed according to a proportion, and are subjected to air flow crushing to form 5% isopyrazam and 1% prochloraz wettable powder.
Example 4: 5% isopyrazam and 1% prochloraz water dispersible granule
5% of isopyrazam, 1% of prochloraz, 10% of calcium lignosulphonate (dispersant), 5% of sodium dodecyl benzene sulfonate (wetting agent), 5% of ammonium sulfate (disintegrant), 0.1% of polyethylene glycol (binder) and 100% of kaolin.
The components are uniformly mixed according to a ratio, and then are subjected to air flow crushing to prepare the 5% isopyrazam and 1% prochloraz water dispersible granule.
Example 5: 20% tetramycin and 1% prochloraz water dispersible granule
20% of tetramycin, 1% of prochloraz, 10% of sodium lignosulfonate (dispersing agent), 5% of sodium dodecyl benzene sulfonate (wetting agent), 5% of sodium chloride (disintegrating agent), 3% of polyethylene glycol (binder) and 100% of kaolin.
The components are uniformly mixed according to a certain proportion and then are subjected to air flow crushing to prepare the 20 percent tetramycin and 1 percent prochloraz water dispersible granule.
Example 6: 10% tetramycin and 1% prochloraz water dispersible granule
10% of tetramycin, 1% of prochloraz, 10% of sodium lignosulfonate (dispersing agent), 5% of sodium dodecyl benzene sulfonate (wetting agent), 5% of sodium chloride (disintegrating agent), 3% of polyethylene glycol (binder) and 100% of kaolin.
The components are uniformly mixed according to a certain proportion and then are subjected to air flow crushing to prepare the 10 percent tetramycin and 1 percent prochloraz water dispersible granule.
Example 7: 1% tetramycin and 1% prochloraz water dispersible granule
1% of tetramycin, 1% of prochloraz, 10% of sodium lignosulfonate (dispersing agent), 5% of sodium dodecyl benzene sulfonate (wetting agent), 5% of sodium chloride (disintegrating agent), 3% of polyethylene glycol (binder) and 100% of kaolin.
The components are uniformly mixed according to a certain proportion and then are subjected to air flow crushing to prepare the 1 percent tetramycin and 1 percent prochloraz water dispersible granules.
Experiment of potting
Yuhua 9326 is selected for seedling culture. And after 15 days, selecting healthy peanut plants with consistent growth vigor for carrying out pot culture tests. Inoculating sclerotium rolfsii to the stem of peanut root, irrigating root after 2 days and applying pesticide. After 7 d, the incidence and disease index were counted. Each treatment of 20 peanut plants was repeated 4 times.
The classification criteria are as follows:
level 0: no disease spots;
level 1: the lesion is smaller than 1/3 pedicles;
and 3, level: the disease spots are larger than 2/3 stems, and a small amount of hypha is on the ground;
and 5, stage: the disease spots are larger than 2/3 stems, and a large amount of hypha is on the ground;
and 7, stage: the disease spot is larger than 2/3 stems, the ground has a large amount of hyphae, and the overground part of the disease spot has wilting;
and 9, stage: the plants died.
The drug effect calculation method comprises the following steps: death rate (%) = number of dead plants/total number of plants × 100.
Disease index = ∑ (number of diseased plants at each stage × relative stage value)/(total number of plants × 9) × 100.
Control effect (%) = (control treatment disease index-medicament treatment disease index)/control treatment disease index × 100.
The potting control effect is as follows in tables 3 and 4.
TABLE 3 potted plant control of southern blight with agents of examples 2 to 4
As can be seen from the table 3, the potted plant control effect is consistent with the result of indoor toxicity measurement, and when the isopyrazam and the prochloraz are compounded according to the ratio of 5:1, the control effects of different dosage forms are superior to the control effects of two single agents.
TABLE 4 potted control of southern blight with agents of examples 5 to 7
As can be seen from Table 4, the control effect of the potted plant is consistent with the results of indoor bioassay tests, and the control effects (86.09 percent and 84.11 percent) of the tetramycin and the prochloraz at the mass ratio of 20:1 and 10:1 are obviously higher than the control effects of two single agents, namely tetramycin (75.50 percent) and prochloraz (46.52 percent). Therefore, the compound dosage of tetramycin and prochloraz is recommended to be 20:1 and 10:1 in field application.
In conclusion, after the isopyrazam or the tetramycin and the prochloraz are compounded, the composition has obvious synergistic effect on the peanut southern blight within the proportion range of 1:20-20:1, and is safe for peanut plants. In addition, the two combinations have the most obvious synergistic effect under the compound dosage of 5:1 of the isopyrazam and the prochloraz and under the compound dosage of 20:1 and 10:1 of the tetramycin and the prochloraz. Thus, the present study shows that: the tetramycin/isopyrazam and prochloraz can be compounded for preventing and treating peanut southern blight. The popularization and the application of the compound preparation of the invention have important significance on the comprehensive management of the peanut southern blight.
Claims (8)
1. The bactericidal composition for preventing and treating southern blight is characterized in that the effective components consist of prochloraz and isopyrazam or tetramycin;
the mass ratio of prochloraz to isopyrazam or tetramycin is 1:20-20: 1.
2. The bactericidal composition for controlling southern blight according to claim 1, wherein the mass ratio of prochloraz to isopyrazam is 1: 5.
3. The bactericidal composition for controlling southern blight according to claim 1, wherein the mass ratio of prochloraz to tetramycin is 1: 10-20.
4. The bactericidal composition for controlling southern blight according to claim 1, wherein the bactericidal composition is formulated into a suspension, water dispersible granules, wettable powder, granules, aqueous emulsion, emulsifiable concentrate or microcapsules according to a conventional technique in the art.
5. The bactericidal composition for preventing and treating southern blight according to claim 4, wherein when the bactericidal composition is prepared into a suspending agent, the weight percentages of the raw materials are as follows: 5% of isopyrazam, 1% of prochloraz, 3% of sodium lignosulfonate, 3% of polycarboxylate, 1% of alkylphenol polyoxyethylene, 0.2% of xanthan gum, 1% of magnesium aluminum silicate, 2% of ethylene glycol, 0.3% of organic silicon defoamer, 0.1% of sodium benzoate and the balance of deionized water.
6. The bactericidal composition for controlling southern blight according to claim 4, wherein when being prepared into wettable powder, the weight percentages of the raw materials are as follows: 5% of isopyrazam, 1% of prochloraz, 1% of sodium dodecyl sulfate, 6% of calcium lignosulphonate, 2% of nekal and the balance of kaolin.
7. The bactericidal composition for controlling southern blight according to claim 4, wherein when the bactericidal composition is prepared into water dispersible granules, the weight percentages of the raw materials are as follows: 5% of isopyrazam, 1% of prochloraz, 10% of calcium lignosulfonate, 5% of sodium dodecyl benzene sulfonate, 5% of ammonium sulfate, 0.1% of polyethylene glycol and the balance of kaolin.
8. The bactericidal composition for controlling southern blight according to claim 4, wherein when the bactericidal composition is prepared into water dispersible granules, the weight percentages of the raw materials are as follows: 1-20% of tetramycin, 1-10% of prochloraz, 10% of sodium lignin sulfonate, 5% of sodium dodecyl benzene sulfonate, 5% of sodium chloride, 3% of polyethylene glycol and the balance of kaolin.
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| CN114766487B (en) * | 2022-04-02 | 2023-11-03 | 河南农业大学 | Application of butenyl phthalide and butylphthalide in preventing and treating crop southern blight |
| CN116035018A (en) * | 2022-12-22 | 2023-05-02 | 河南农业大学 | Sterilization composition for preventing and treating peanut rot and application thereof |
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| CN109105375A (en) * | 2018-08-17 | 2019-01-01 | 重庆市农业技术推广总站 | Reduce the comprehensive application preventing control method of efficient medicine fertilizer of capsicum continuous cropping obstacle disease incidence |
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| CN107853316A (en) * | 2017-12-12 | 2018-03-30 | 广东中迅农科股份有限公司 | A kind of bactericidal composition containing cyprodinil and Prochloraz |
| CN109105375A (en) * | 2018-08-17 | 2019-01-01 | 重庆市农业技术推广总站 | Reduce the comprehensive application preventing control method of efficient medicine fertilizer of capsicum continuous cropping obstacle disease incidence |
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