CN114304176A - Insecticidal composition containing monosultap and application thereof - Google Patents
Insecticidal composition containing monosultap and application thereof Download PDFInfo
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- CN114304176A CN114304176A CN202111502250.1A CN202111502250A CN114304176A CN 114304176 A CN114304176 A CN 114304176A CN 202111502250 A CN202111502250 A CN 202111502250A CN 114304176 A CN114304176 A CN 114304176A
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Abstract
The invention discloses a monosultap-containing insecticidal composition, which is prepared by adding active ingredients into water suspension of biochar, stirring for dissolving, then mixing with sodium alginate water solution, stirring, and dropwise injecting CaCl2In the solution, after gelation, filtering and collecting hydrogel microspheres, washing with deionized water for at least 3 times, and freeze drying at 55-60 deg.C to obtain granular insecticidal compositionThe effective components comprise monosultap and at least one of imidacloprid, thiamethoxam, clothianidin and dinotefuran, and the mass ratio of the monosultap to the imidacloprid to the thiamethoxam to the dinotefuran is 2: 5-20; the prepared insecticidal composition has a pH and ionic strength dual-stimulus response controlled release system, has a better control effect on tomato root-knot nematodes, is not easy to generate drug resistance, improves the soil environment and promotes the growth of plants; the preparation method is simple, the cost is low, the biological carbon and the sodium alginate are used as carriers, the toxic effect on cell proliferation is small, and the biological safety is good.
Description
Technical Field
The invention relates to the technical field of pesticides, and particularly relates to an insecticidal composition containing monosultap and application thereof.
Background
China is a big agricultural country, the problem of sufficient food supply is great, and the prevention and the treatment of fertilizers and plant diseases and insect pests play an important role in the good growth of the food. Therefore, it is necessary to research and develop technologies for reducing pesticide application and improving pesticide efficiency aiming at different planting systems, create novel pesticides, and realize quality improvement, cost saving and efficiency improvement of crop production.
Disclosure of Invention
In view of the above situation, the present invention aims to provide an insecticidal composition containing monosultap, which is prepared by compounding monosultap with one or more of imidacloprid, thiamethoxam, clothianidin and dinotefuran, and taking biochar and sodium alginate as carriers, so as to prepare insecticidal composition particles with PH response and high efficiency.
The technical scheme for solving the problem is as follows:
an insecticidal composition containing monosultap comprises the following two components as effective components, wherein the first component is monosultap, and the second component is one or more of imidacloprid, thiamethoxam, clothianidin and dinotefuran; the insecticidal composition is prepared by the following method: (1) adding the effective components into the water suspension of the biochar, and then stirring the solution until the effective components are completely dissolved to obtain a mixture I; (2) adding a sodium alginate aqueous solution into the mixture I in the step (1), and then stirring for 12 hours to obtain a mixture II; (3) the prepared mixture II is dropwise added into CaCl2Gelling in the solution for 30-50min, filtering and collecting hydrogel microspheres, washing with deionized water for at least 3 times, and freeze-drying at 55-60 ℃ to obtain a granular insecticidal composition; the obtained pesticidal composition has a BET specific surface area of 4.30 to 4.35m2/g。
Further, the mass ratio of the first component to the second component is 2: 5-20.
Further, the content of the biochar in the water suspension of the biochar is 1g/5 mL; the mass fraction of sodium alginate in the sodium alginate aqueous solution is 2.5%; the CaCl is2CaCl in solution2Is 2 percent.
Further, the active ingredients comprise water suspension of biochar, sodium alginate aqueous solution and CaCl2The mass-volume ratio of the solution is as follows: 20-30mL of 1.8-2.4g, 80-100mL of 50-70mL of the total weight.
Further, the biochar is obtained by carrying out pyrolysis on straw at 350 ℃.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages:
(1) the granular insecticidal composition prepared by encapsulating active ingredients such as monosultap and the like by taking the biochar and the sodium alginate as carriers has a pH and ionic strength dual-stimulus response controlled-release system, and is prepared by the sodium alginate and the Ca2+The simple cross-linking reaction between the two components, the effective components such as monosultap and the like are combined into the biological carbon and the hydrogel with the 3D network structure, so that the generated compact outer surface can respond to certain pH value or ionic strength stimulation like a switch, thereby regulating effective drug molecules from inside to outside and showing controlled release performance;
(2) the granular insecticidal composition prepared by the invention is compounded by monosultap and one or more of imidacloprid, thiamethoxam, clothianidin and dinotefuran, has a good prevention and treatment effect on tomato root-knot nematodes, is not easy to generate drug resistance, improves the soil environment and is beneficial to plant growth;
(3) the method for preparing the granular insecticidal composition is simple and low in cost, and the utilization rate of the active ingredients is improved by controlling the release behavior of the pesticide and reducing the leaching loss of the pesticide;
(4) the invention takes the biochar and the sodium alginate as carriers, has little toxic effect on cell proliferation, and has good biological safety and potential application prospect.
Detailed Description
Example 1
An insecticidal composition containing monosultap is prepared by the following method: (1) adding the effective components into a water suspension of 1g/5mL biochar, and then stirring the solution until the effective components are completely dissolved to obtain a mixture I; (2) adding 2.5% sodium alginate aqueous solution into the mixture I in the step (1), and then stirring for 12 hours to obtain a mixture II; (3) the prepared mixture II was added dropwise to 2% CaCl2In the solution, after gelation for 30min, filtering and collecting hydrogel microspheres, washing with deionized water for at least 3 times, and freeze-drying at 55 ℃ to obtain a granular insecticidal composition;
the active ingredients comprise water suspension of charcoal, sodium alginate aqueous solution and CaCl2The mass-volume ratio of the solution is as follows: 1.8g, 30mL, 80mL, 50 mL;
the effective components comprise monosultap and imidacloprid and thiamethoxam, the mass ratio of the first component to the second component is 2:5, and the mass ratio of the imidacloprid to the thiamethoxam is 1: 20;
the biochar is obtained by carrying out pyrolysis on straws at 350 ℃;
the BET specific surface area of the resulting insecticidal composition was 4.33m2/g。
Example 2
An insecticidal composition containing monosultap is prepared by the following method: (1) adding the effective components into a water suspension of 1g/5mL biochar, and then stirring the solution until the effective components are completely dissolved to obtain a mixture I; (2) adding 2.5% sodium alginate aqueous solution into the mixture I in the step (1), and then stirring for 12 hours to obtain a mixture II; (3) the prepared mixture II was added dropwise to 2% CaCl2In the solution, after gelation for 40min, filtering and collecting hydrogel microspheres, washing with deionized water for at least 3 times, and freeze-drying at 58 ℃ to obtain a granular insecticidal composition;
the active ingredients comprise water suspension of charcoal, sodium alginate aqueous solution and CaCl2The mass-volume ratio of the solution is as follows: 2.1g, 25mL, 90mL, 60 mL;
the effective components comprise monosultap and thiamethoxam, the mass ratio of the first component to the second component is 1:5, and the mass ratio of the thiamethoxam to the thiamethoxam is 25: 3; the biochar is obtained by carrying out pyrolysis on straws at 350 ℃;
the BET specific surface area of the obtained insecticidal composition was 4.32m2/g。
Example 3
An insecticidal composition containing monosultap is prepared by the following method: (1) adding the effective components into a water suspension of 1g/5mL biochar, and then stirring the solution until the effective components are completely dissolved to obtain a mixture I; (2) adding 2.5% sodium alginate aqueous solution into the mixture I in the step (1), and then stirring for 12 hours to obtain a mixture II; (3) the prepared mixture II was added dropwise to 2% CaCl2In the solution, after gelation for 50min, filtering and collecting hydrogel microspheres, washing with deionized water for at least 3 times, and freeze-drying at 60 ℃ to obtain a granular insecticidal composition;
the active ingredients comprise water suspension of charcoal, sodium alginate aqueous solution and CaCl2The mass-volume ratio of the solution is as follows: 2.4g, 30mL, 100mL, 70 mL;
the effective components comprise monosultap and clothianidin and dinotefuran, wherein the first component is 2:15, and the second component is 4: 17;
the biochar is obtained by carrying out pyrolysis on straws at 350 ℃;
the BET specific surface area of the obtained insecticidal composition was 4.35m2/g。
Example 4
An insecticidal composition containing monosultap is prepared by the following method: (1) adding the effective components into a water suspension of 1g/5mL biochar, and then stirring the solution until the effective components are completely dissolved to obtain a mixture I; (2) adding 2.5% sodium alginate aqueous solution into the mixture I in the step (1), and then stirring for 12 hours to obtain a mixture II; (3) the prepared mixture II was added dropwise to 2% CaCl2In solution, gel 40mAfter in, filtering and collecting hydrogel microspheres, washing with deionized water for at least 3 times, and freeze-drying at 58 ℃ to obtain a granular insecticidal composition;
the active ingredients comprise water suspension of charcoal, sodium alginate aqueous solution and CaCl2The mass-volume ratio of the solution is as follows: 2.1g, 25mL, 90mL, 60 mL;
the effective components comprise monosultap and thiamethoxam and dinotefuran, wherein the mass ratio of the first component to the second component is 1: 10; the mass ratio of the thiamethoxam to the dinotefuran is 1: 1;
the biochar is obtained by carrying out pyrolysis on straws at 350 ℃;
the BET specific surface area of the resulting insecticidal composition was 4.30m2/g。
Example 5
An insecticidal composition containing monosultap is prepared by the following method: (1) mixing the effective components to obtain the insecticidal composition;
the effective components comprise monosultap and thiamethoxam, the mass ratio of the first component to the second component is 1:5, and the mass ratio of the thiamethoxam to the thiamethoxam is 25: 3.
Test example 1
50mg of the dry pesticidal composition granules prepared in examples 1-4 were ground and placed in 50mL of ethanol solution. After 10min of sonication, the solution was shaken for a further 2h and then centrifuged at 8000 r/min. Transferring 1mL of supernatant into a centrifuge tube, diluting the supernatant into 3mL of supernatant with ethanol, detecting the absorbance of the active ingredients by using an ultraviolet-visible spectrophotometer, and calculating the encapsulation efficiency according to a standard curve, wherein the encapsulation efficiency (%) is equal to the content of the active ingredients in the solution/the theoretical weight of the active ingredients in the dried insecticidal composition multiplied by 100; the results are as follows:
| TABLE 1 | Encapsulation efficiency (%) |
| Example 1 | 92.3 |
| Example 2 | 93.5 |
| Example 3 | 90.6 |
| Example 4 | 91.8 |
As can be seen from Table 1, the encapsulation efficiency of the granules of the insecticidal compositions prepared in examples 1 to 4 was as high as 90%, and the encapsulation effect was good.
Test example 2
Taking the dried insecticidal composition particles prepared in examples 1-4, immersing in 50mL of phosphate buffer solution with pH values of 6.0, 7.0 and 8.0 respectively, sucking 5mL of supernatant at 20min, 50min and 100min, replacing with 5mL of fresh solution with corresponding pH value, detecting the concentration of the released effective components by an ultraviolet-visible spectrophotometer, and calculating the cumulative release rate; the release behaviour of the insecticidal composition particles at sodium chloride ion concentrations of 0.01, 0.1 and 1.0mol/L was tested by the same method, each group being repeated three times; tables 2 and 3 are obtained as follows:
table 2:
table 3:
as can be seen from tables 2 and 3, the pesticidal compositions prepared in examples 1 to 4 had a pH and ionic strength dual stimulus-responsive controlled release system, and the cumulative release rate of the active ingredient gradually decreased with increasing pH and increased with increasing time, and among different ionic strengths, the pesticidal composition had a smaller cumulative release rate of the active ingredient at a sodium chloride ion concentration of 0.01mol/L and increased with increasing ionic concentration, but when the ionic concentration was too large and increased to a sodium chloride ion concentration of 1.0mol/L, the cumulative release rate was rather decreased. The slow release rate of the active ingredients in the insect composition can thus be adjusted by pH and ionic strength.
Test example 3
The pot experiment is carried out in a sunlight greenhouse of our company, and the root-knot nematodes are seriously generated in the greenhouse throughout the year. The soil was test field soil to which no pesticide was applied, and the soil content per flowerpot was 2.5 kg. And selecting the Muli seedlings with equivalent growth for about 40 days, and transplanting the Muli seedlings into a flowerpot one for each pot. After the seedlings are revived, punching holes (6-hole pots) around the root system by using a puncher, injecting the collected root-knot nematodes into the holes (1000 pots), injecting clear water serving as a pest-free control, and covering soil for about 1 cm. The next day after inoculation of nematodes, the insecticide composition prepared in examples 1-4 and example 5, the commercially available insecticidal unit, the commercially available thiamethoxam and the commercially available clothianidin are treated with the insecticide in an amount of 25 mg/kg soil, each treatment is repeated 5 times, 10 pots are repeated, clear water is added to treat the insecticide composition without the insecticide, a shallow trench is drawn around the seedling before harvest, the insecticide is uniformly distributed in the trench according to the designed dose, soil is covered, a blank control group is added without any insecticide treatment, the plant height, the vitality and the fresh weight of the overground part of the carica papaya are measured 30d after treatment, the total root knot number of each root system is investigated, the plant vitality is 0-100%, 0% of the plant dies, 100% of the plant grows vigorously, and the grade 0 of the healthy seedling, disease-free seedling, and root knot index grading standard, No root knot exists; level 1: less than 10% of the roots have root knots, but the root knots are not connected with each other; and 2, stage: 11-30% of the root systems are provided with root knots, and only a small number of root knots are connected with each other; and 3, level: 31-50% of the root systems are provided with root knots, and less than half of the root knots are mutually connected; 4, level: 51-75% of root systems are provided with root knots, more than half of the root knots are mutually connected, and partial main roots and lateral roots become thick and are in a malformed state; and 5, stage: more than 75% of the root systems are provided with root knots which are mutually connected, and most of the main roots and the lateral roots become thick and deformed; the results are shown in Table 4:
as can be seen from table 4, the insecticidal compositions prepared in examples 1 to 4, which are prepared by compounding monosultap and one or more of imidacloprid, thiamethoxam, clothianidin and dinotefuran, have an obvious control effect on the root knot nematode, the relative control effect of the insecticidal compositions is 84%, the root knot index is lower than 0.95, and compared with example 5, the insecticidal compositions prepared in examples 1 to 4 by using biochar and sodium alginate as carriers have an obvious promotion effect on the plant height, vitality and fresh weight of the overground part of the tomato.
The foregoing is a more detailed description of the invention that follows in connection with the detailed description, which is not intended to limit the invention to the particular form disclosed; for those skilled in the art to which the present invention pertains and related technologies, the extension, operation method and data replacement should fall within the protection scope of the present invention based on the technical solution of the present invention.
Claims (7)
1. The insecticidal composition containing the monosultap is characterized in that the effective components of the insecticidal composition are composed of the following two components, wherein the first component is the monosultap, and the second component is one or more of imidacloprid, thiamethoxam, clothianidin and dinotefuran; the insecticidal composition is prepared by the following method:(1) adding the effective components into the water suspension of the biochar, and then stirring the solution until the effective components are completely dissolved to obtain a mixture I; (2) adding a sodium alginate aqueous solution into the mixture I in the step (1), and then stirring for 12 hours to obtain a mixture II; (3) the prepared mixture II is dropwise added into CaCl2Gelling in the solution for 30-50min, filtering and collecting hydrogel microspheres, washing with deionized water for at least 3 times, and freeze-drying at 55-60 ℃ to obtain a granular insecticidal composition; the obtained pesticidal composition has a BET specific surface area of 4.30 to 4.35m2/g。
2. The monosultap-containing insecticidal composition according to claim 1, wherein the mass ratio of the first component to the second component is from 2:5 to 20.
3. The monosultap-containing pesticidal composition according to claim 1, wherein the content of biochar in the aqueous suspension of biochar is 1g/5 mL; the mass fraction of sodium alginate in the sodium alginate aqueous solution is 2.5%; the CaCl is2CaCl in solution2Is 2 percent.
4. The monosultap-containing insecticidal composition according to claim 1, wherein said active ingredient is aqueous suspension of biochar, sodium alginate aqueous solution, CaCl2The mass-volume ratio of the solution is as follows: 20-30mL of 1.8-2.4g, 80-100mL of 50-70mL of the total weight.
5. An insecticidal composition according to claim 1 wherein said biochar is derived from straw by pyrolysis at 350 ℃.
6. The monosultap-containing pesticidal composition of any one of claims 1-5, wherein said composition is formulated as a tablet. The insecticidal composition is used for preventing and treating tomato root-knot nematodes.
7. The monosultap-containing insecticidal composition according to claim 6, wherein the monosultap-containing insecticidal composition is used by the method comprising: is buried in the root of tomato.
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2021
- 2021-12-10 CN CN202111502250.1A patent/CN114304176A/en active Pending
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Non-Patent Citations (1)
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