Pesticide containing rust-coloured crotalaria herb with root and preparation method thereof

Abstract

The invention belongs to the technical field of insecticide preparation, and particularly relates to an insecticide containing rust-coloured crotalaria herb with root and a preparation method of the insecticide. Raw materials of the insecticide comprise 30-40% of a Chinese herbal medicine component, 30-50% of a surfactant and 20-30% of an auxiliary agent, the Chinese herbal medicine contains rust-coloured crotalaria herb with root, the insecticide prepared from the rust-coloured crotalaria herb with root as the raw material is good in insecticidal performance, has a rapid killing effect on various crop pests, is high in insecticidal efficiency and does not generate antibodies in pest bodies; meanwhile, the degradation speed is high, the environment cannot be polluted, the body health of farmers cannot be harmed, and the application of the rust-coloured crotalaria herb with root is further widened.

Description

Technical Field

[0001] The invention belongs to the technical field of insecticide preparation, and particularly relates to an insecticide containing bellwort and a preparation method thereof. Background Art

[0002] Pests such as aphids, whiteflies, mites, thrips, green leafhoppers, and web bugs are important pests on crops. These pests have large reproduction and obvious generation overlap. In recent years, due to the increase in the use of pesticides and unscientific use, pest resistance has become increasingly serious; and the high-intensity use of pesticides has not only led to problems such as excessive pesticide residues and increased pesticide costs for farmers, but also is not conducive to the sustainable development of agriculture and has a certain impact on farmers' health. Therefore, the development of low-toxic pesticides that can quickly kill pests will not only help delay the development of pest resistance, but also avoid harm to farmers' bodies and reduce pollution to the environment.

[0003] As a Chinese herbal medicine, bellflower has the effects of astringing lung qi, tonifying spleen and kidney, promoting urination, and reducing swelling and toxins. It also has the following effects: clearing away heat and dampness, detoxifying and clearing rashes, killing insects, anti-inflammatory, and anti-pathogenic microorganisms. It can be used to treat eczema, wet sores, skin itching, skin cancer, scabies and leprosy, and external treatment of trichomonal vaginitis. The inventors have found that bellflower is rich in alkaloids such as crotalurine, crotalurine, crotalurine, nelejirine, and crotalurine. In addition to its extremely high efficacy as a traditional Chinese medicine, it also has obvious anti-inflammatory and insecticidal effects. At present, the application of bellflower is mainly based on human medication, and there is little disclosure of the technology of using bellflower in insecticides.

[0004] If bellflower can be used in pesticides and its medicinal value can be fully utilized, the following problems existing in the use of the above-mentioned pesticides may be solved: for example, the increasing resistance of pests to chemical agents, excessive pesticide residues, increased drug costs, harm to people's bodies caused by chemicals, and pollution to the environment. Summary of the invention

[0005] In order to solve the above-mentioned technical problems, the present invention provides an insecticide containing bellflower and a preparation method thereof. By using bellflower as the raw material of the insecticide and compounding it with other Chinese herbal medicines, the obtained insecticide has high insecticidal efficiency, fast degradation rate, can quickly kill crop pests without polluting the environment, and will not cause drug antibodies to be produced in the insect body. At the same time, it has a good preventive effect on diseases such as gray mold and downy mildew.

[0006] When the inventors were studying bellflower, they unexpectedly discovered that the insecticide made with bellflower as raw material has good insecticidal properties, has a rapid killing effect on a variety of crop pests, has high insecticidal efficiency, will not cause the insects to produce drug antibodies, and is suitable for long-term use; and the insecticide of the present invention has a fast biodegradation rate, will not pollute the environment, will not have pesticide residues, and will not harm the health of farmers. At the same time, it has a good preventive effect on diseases such as gray mold and downy mildew.

[0007] The technical solution of the present invention is as follows:

[0008] In a first aspect of the present invention, there is provided an insecticide containing bell grass, wherein the raw materials of the insecticide include, by weight percentage:

[0009] Chinese herbal medicine components 30-40%, surfactants 30-50% and adjuvants 20-30%.

[0010] Specifically, the Chinese herbal medicine component contains the following raw materials in parts by weight:

[0011] 10-15 parts of bell grass, 10-15 parts of matrine, 8-10 parts of cirsium japonicum, 10-15 parts of fig leaves, 10-15 parts of stemonae, 8-10 parts of citrus aurantium seeds, and 15-20 parts of tobacco stems.

[0012] Furthermore, the surfactant is selected from at least one of sodium dodecyl sulfonate, sodium dodecylbenzene sulfonate, sodium α-olefin sulfonate, sodium fatty acid, and tea saponin.

[0013] Furthermore, the auxiliary agent is selected from at least one of urea, dimethyl fumarate, nisin, propionate, ascorbic acid (and its salts), and γ-aminobutyric acid.

[0014] The present invention also provides a method for preparing the above insecticide, which comprises the following steps:

[0015] (1) Take 15-20 parts of bellflower, 10-15 parts of matrine, 8-10 parts of cirsium japonicum, 10-15 parts of fig leaves, 10-15 parts of stemonae, 8-10 parts of cirsium strychnifolium seeds, and 15-20 parts of tobacco stems, and set aside; the above “parts” are parts by weight;

[0016] (2) crushing the Chinese medicinal materials in (1), adding clean water to obtain a Chinese medicinal material mixed solution, stirring and then letting it stand for later use;

[0017] (3) filtering the mixed solution of Chinese medicinal materials after standing in (2) and adding dimethyl sulfone to the obtained filtrate, heating and boiling, cooling to room temperature and filtering twice to remove impurities, and setting aside;

[0018] (4) evaporating the mixed Chinese herbal medicine solution after the secondary filtration in (3) until there is no obvious water, obtaining Chinese herbal medicine components, and drying and crushing them;

[0019] (5) Take 30-40 wt% of the Chinese herbal medicine components in (4), 30-50 wt% of a surfactant and 20-30 wt% of an auxiliary agent, add defoaming powder and mix well to obtain an insecticide.

[0020] Preferably, after the crushing in (2), clean water 5 times the mass of the Chinese herbal medicine is added.

[0021] The standing time described in (2) is 10 minutes.

[0022] (3) Add 10-20 parts by weight of dimethyl sulfone.

[0023] The heating and boiling described in (3) is specifically: high heat for 10 minutes and low heat for 40 minutes.

[0024] Furthermore, the surfactant in (5) is at least one of sodium dodecyl sulfonate, sodium dodecylbenzene sulfonate, sodium α-olefin sulfonate, sodium fatty acid, and tea saponin, which is used as a wetting and spreading agent and insecticide synergist of the insecticide.

[0025] Furthermore, the auxiliary agent in (5) is at least one of urea, dimethyl fumarate, nisin, propionate, ascorbic acid (and its salts), and γ-aminobutyric acid, which is used to increase the insecticidal rate and has a bactericidal effect.

[0026] Furthermore, 1-2 wt% of defoaming powder is added to (5), and the amount of defoaming powder is based on the sum of the Chinese herbal medicine components, surfactants and adjuvants.

[0027] The beneficial effects of the present invention are:

[0028] (1) In the present invention, bell grass is used as a raw material to prepare an insecticide, and other Chinese herbal medicine ingredients, surfactants and adjuvants are compounded. The obtained insecticide has excellent insecticidal properties, has a rapid killing effect on a variety of crop pests, has a high insecticidal efficiency, will not cause the insects to produce drug antibodies, and is suitable for long-term use; and the insecticide of the present invention has a fast biodegradation rate, will not pollute the environment, will not have pesticide residues, and will not harm the health of farmers.

[0029] (2) The present invention uses bellflower as a raw material and compounded with other Chinese herbal medicine ingredients, surfactants and adjuvants, so that the prepared insecticide not only has insecticidal efficacy, but also has a good preventive effect on gray mold and downy mildew, which provides a new idea for the preparation and development of insecticides.

[0030] (3) The insecticide obtained by the present invention is in the form of black and white particles, has simple ingredients, is easily soluble in water, is easy to use, can be quantitatively packaged by machine, saves a lot of labor and packaging costs, and is suitable for large-scale production. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in conjunction with specific implementation methods.

[0032] Example 1

[0033] An insecticide containing bell grass, the raw material composition of which is shown in Table 1:

[0034] Table 1 Raw material ratio of the insecticide in Example 1

[0035]

[0036] The preparation method of the above insecticide is:

[0037] (1) Weigh the Chinese herbal medicines according to the weight proportions of the Chinese herbal medicines shown in Table 1;

[0038] (2) crushing the Chinese herbal medicine in (1), adding clean water 5 times the weight of the Chinese herbal medicine to obtain a mixed solution of Chinese herbal medicine, stirring and then letting it stand for 10 minutes for later use;

[0039] (3) filtering the Chinese herbal medicine mixed solution after standing in (2), and adding dimethyl sulfone to the obtained filtrate in an amount of 15 parts by weight, wherein dimethyl sulfone is added to dissolve the water-insoluble active ingredients in the Chinese herbal medicine, heating and boiling (first boiling for 5 minutes with high heat, then boiling for 30 minutes with low heat), cooling to room temperature, filtering a second time to remove impurities, and setting aside;

[0040] (4) evaporating the mixed solution of Chinese herbal medicines after secondary filtration in (3) until there is no obvious water, obtaining effective components of Chinese herbal medicines, drying and crushing them for later use;

[0041] (5) Take 30 wt% of the Chinese herbal medicine component in (4), 40 wt% of the surfactant sodium dodecyl sulfate and 30 wt% of the auxiliary agent dimethyl fumarate, weigh the raw materials, add defoaming powder and mix them evenly to obtain an insecticide. The amount of defoaming powder used is 1.5 wt% based on the total weight of the Chinese herbal medicine component, sodium dodecyl sulfate and dimethyl fumarate.

[0042] Example 2

[0043] An insecticide containing bell grass, the raw material composition of which is shown in Table 2:

[0044] Table 2 Raw material ratio of the pesticide in Example 2

[0045]

[0046] The preparation method of the above insecticide is the same as that of Example 1.

[0047] Example 3

[0048] An insecticide containing bell grass, the raw material composition of which is shown in Table 3:

[0049] Table 3

[0050]

[0051] The preparation method of the above insecticide is the same as that of Example 1.

[0052] Example 4

[0053] An insecticide containing bell grass, the raw material composition of which is shown in Table 4:

[0054] Table 4

[0055]

[0056] The preparation method of the above insecticide is the same as that of Example 1.

[0057] Example 5

[0058] An insecticide containing bell grass, the raw material composition of which is shown in Table 5:

[0059] Table 5

[0060]

[0061] The preparation method of the above insecticide is the same as that of Example 1.

[0062] Application Example 1

[0063] Pesticide efficacy test

[0064] The insecticide prepared in the above Example 1 of the present invention was diluted with 400-1500 times of clean water to prepare insecticide solutions, and insecticide tests were carried out on Pieris rapae.

[0065] (I) Indoor toxicity determination

[0066] 1. Test pests: Pieris rapae was raised in our laboratory.

[0067] 2.Objective: To evaluate the efficacy of this formula in controlling Pieris rapae through indoor toxicity determination and field control tests.

[0068] 3. Test reagents:

[0069] 4. Indoor toxicity determination: The toxicity of the agent to Pieris rapae was determined by the immersion method. The test agent was prepared into a certain concentration of liquid, and the 2nd instar larvae of Pieris rapae raised indoors were immersed in the liquid for 10 seconds. The liquid on the surface of the insect body was absorbed with filter paper, and the test insects were placed in a culture dish covered with filter paper. The test insects were raised and observed at room temperature, and the death of the test insects was recorded and the corrected mortality rate was calculated.

[0070] Table 6 Toxicity test record of the agent of Example 1 to cabbage worm

[0071]

[0072]

[0073] From the data in the above table, it can be seen that the average mortality rate of 50 cabbage worms in the clear water control group is only 3%; in the present invention, when diluted 400 times and 800 times, the average mortality rate of cabbage worms is 96%; when diluted 1000 times, the average mortality rate of cabbage worms is 95.5%.

[0074] In addition, the above method was also used for the pesticides in Examples 2-5, and corresponding experiments were conducted, and the results are as follows:

[0075] Table 7 Average mortality rate of the agents in Examples 2-5 for the toxicity test of cabbage worm (%)

[0076] Dilution multiple Example 2 Example 3 Example 4 Example 5 400 95.8 96.1 96.0 95.7 800 95.6 95.8 95.5 95.5 1000 95.2 95.4 95.5 95.3 1200 87.1 87.4 87.5 87.3 1500 79.6 79.5 79.5 79.8

[0077] It can be seen from the data in the above table that the agents in Examples 2-5 are also very effective in killing cabbage loopers.

[0078] (II) Field control test: The test was conducted in an open field cabbage field. According to field survey, the test was carried out at the peak period of egg laying and 1st instar larvae of Pieris rapae. Five concentration treatments (drugs in Example 1) were set up in the test. Each treatment was repeated 4 times, randomly arranged, and the plot area was 20m 2 1.5 kg (50 kg / mu) of the test solution was sprayed in each plot. The population density of cabbage loopers was investigated before application, and the number of remaining insects was investigated 3 days and 7 days after application, and the population reduction rate and control effect were calculated.

[0079] Table 8 Field test record of the pesticide used in Example 1 to control cabbage worm

[0080]

[0081]

[0082] From the field control effect, it can be seen that when diluted 400 times, the average control effect can reach 85.52%; when diluted 800 times, the average control effect can reach 80.7%. This shows that the insecticide provided by the present invention has excellent control effect on cabbage loopers.

[0083] Table 9 Average efficacy of the pesticides used in Examples 2-5 in field trials for controlling cabbage worms (%)

[0084] Dilution multiple Example 2 Example 3 Example 4 Example 5 400 85.13 85.67 85.25 85.34 800 80.05 80.66 80.47 80.38 1000 76.28 76.18 76.25 76.51 1200 68.22 68.35 68.02 67.98 1500 53.96 54.14 53.93 53.87

[0085] From the data in the above table, it can be seen that the control effects of the agents of Examples 2-5 are equivalent to those of Example 1. When diluted 800 times, the average control effect is about 80%. This shows that both laboratory experiments and field control effects have proved that the product of the present invention has excellent control effects on Pieris rapae.

Claims

1. An insecticide containing bell grass, characterized in that: In terms of weight percentage, the raw materials of the pesticide include: 30-40% Chinese herbal components, 30-50% surfactants and 20-30% adjuvants.

2. The insecticide according to claim 1, characterized in that The Chinese herbal medicine component contains, by weight: 10-25 parts of bell grass, 10-15 parts of matrine, 8-10 parts of cirsium japonicum, 10-15 parts of fig leaves, 10-15 parts of stemonae, 8-10 parts of citrus aurantium seeds, and 15-20 parts of tobacco stems.

3. The insecticide according to claim 1, characterized in that The surfactant is selected from at least one of sodium dodecyl sulfonate, sodium dodecylbenzene sulfonate, sodium α-olefin sulfonate, sodium fatty acid, and tea saponin.

4. The insecticide according to claim 1, characterized in that The auxiliary agent is selected from at least one of urea, dimethyl fumarate, nisin, propionate, ascorbic acid or its salt, and gamma-aminobutyric acid.

5. The method for preparing the insecticide according to claim 1, characterized in that: The preparation method comprises the following steps: (1) Weigh the following Chinese herbal medicines according to the following weight proportions: 10-15 parts of bellflower, 10-15 parts of matrine, 8-10 parts of cirsium japonicum, 10-15 parts of fig leaves, 10-15 parts of stemonae, 8-10 parts of cirsium strychnos seeds, and 15-20 parts of tobacco stems; (2) Crush the Chinese herbal medicines in (1) above, add clean water to obtain a Chinese herbal medicine mixed solution, stir and let stand for later use; (3) filtering the mixed solution of Chinese herbal medicines after standing in (2) and adding dimethyl sulfone to the obtained filtrate to dissolve the water-insoluble active ingredients in the Chinese herbal medicines, heating and boiling, cooling to room temperature, filtering a second time to remove impurities, and setting aside; (4) evaporating the mixed solution of Chinese herbal medicines after secondary filtration and impurity removal in (3) until there is no obvious water, drying and crushing to obtain Chinese herbal medicine components; (5) Take 30-40wt% of the Chinese herbal medicine components in (4), 30-50wt% of a surfactant, 20-30wt% of an auxiliary agent, add defoaming powder and mix well to obtain an insecticide.

6. The preparation method according to claim 5, characterized in that: (2) After the Chinese herbal medicine is crushed, add 5 times the weight of clean water; let it stand for 10 minutes.

7. The preparation method according to claim 5, characterized in that: (3) adding 10-20 parts by weight of dimethyl sulfone; the heating and boiling are specifically: high heat for 5 minutes and low heat for 30 minutes.

8. The preparation method according to claim 5, characterized in that: (5) The surfactant is at least one selected from the group consisting of sodium dodecyl sulfonate, sodium dodecylbenzene sulfonate, sodium α-olefin sulfonate, sodium fatty acid, and tea saponin.

9. The preparation method according to claim 5, characterized in that: (5) The auxiliary agent is at least one selected from urea, dimethyl fumarate, nisin, propionate, ascorbic acid or its salt, and γ-aminobutyric acid.

10. The preparation method according to claim 5, characterized in that: In (5), the defoaming powder is in an amount of 1-2 wt % based on the total weight of the Chinese herbal medicine components, the surfactant and the auxiliary agent.

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