A biological pesticide for effectively preventing and treating asparagus stem blight and its preparation method

Abstract

The application discloses a kind of biological pesticides for efficiently preventing and treating asparagus stem blight, comprising the following raw materials by weight parts: carbendazim 5-10 parts, mancozeb 3-6 parts, chlorothalonil 5-8 parts, benlate emulsion 1-5 parts, bordeaux mixture 1-4 parts, bacteriostatic net 2-5 parts, water 150-200 parts, radix isatis 20-30 parts, coptis 15-25 parts, purslane 25-30 parts, dandelion 10-15 parts, isatis leaf 10-15 parts, amomum villosum 5-10 parts, anise 8-15 parts.The extract B extracted from Chinese herbal medicine radix isatis, coptis, purslane, dandelion, isatis leaf, amomum villosum and anise is added in chemical agent carbendazim, mancozeb, chlorothalonil, benlate emulsion, bordeaux mixture and bacteriostatic net, so that the biological pesticides for efficiently preventing and treating asparagus stem blight is finally obtained, which avoids the reduction of prevention and treatment effect on asparagus stem blight by using only chemical agent for a long time.The experimental data shows that the biological pesticides for efficiently preventing and treating asparagus stem blight prepared by the application can effectively prevent and treat asparagus stem blight.

Description

Technical Field

[0001] The invention relates to the technical field of preventing and treating asparagus stem blight, in particular to a biological pesticide for effectively preventing and treating asparagus stem blight and a preparation method thereof. Background Art

[0002] Asparagus, also known as Asparagus officinalis, is a perennial herb of the genus Asparagus in the Asparagaceae family. Its young shoots can be eaten as vegetables and it is known as the "king of vegetables" in the international market. Asparagus has high nutritional value, can moisten the lungs, relieve coughs, and eliminate phlegm, and has the function of inhibiting tumor growth. It is deeply loved by people. In recent years, with the expansion of asparagus cultivation area, the occurrence of diseases has become more serious year by year, especially the occurrence and harm of stem blight have seriously affected the yield and quality of asparagus.

[0003] The pathogen of asparagus stem blight is Phomopsis asparagus, a devastating disease distributed worldwide. The disease spreads rapidly under rainy and windy conditions, and can also be transmitted by rain splashing. Airborne transmission is the main cause of large-scale disease. The direction of spread in the field and the rapidity of onset are often affected by wind. In addition, low-lying terrain, heavy soil, and excessive nitrogen fertilizer can easily aggravate the onset of the disease. In mild cases, it leads to poor growth and development of asparagus, reduced yield and quality. In severe cases, the diseased plants die prematurely and the entire field is destroyed.

[0004] At present, the prevention and control of asparagus stem blight mainly relies on the use of chemical agents. Long-term use will greatly reduce the prevention and control effect of asparagus stem blight, which is not conducive to the efficient prevention and control of asparagus stem blight, thereby affecting the healthy growth of asparagus. Therefore, a biological pesticide that can effectively prevent and control asparagus stem blight is urgently needed to solve the above technical problems. Summary of the Invention

[0005] The object of the present invention is to provide a biopesticide for effectively preventing and treating asparagus stem blight and a preparation method thereof, so as to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A highly effective biological pesticide for preventing and treating asparagus stem blight comprises the following raw materials in parts by weight: 5-10 parts of carbendazim, 3-6 parts of mancozeb, 5-8 parts of chlorothalonil, 1-5 parts of benlate emulsifiable concentrate, 1-4 parts of Bordeaux mixture, 2-5 parts of antibacterial net, 150-200 parts of water, 20-30 parts of isatis root, 15-25 parts of coptis root, 25-30 parts of purslane, 10-15 parts of dandelion, 10-15 parts of isatis indigotica leaf, 5-10 parts of amomum villosum, and 8-15 parts of fennel.

[0008] As a further embodiment of the present invention, the invention comprises the following raw materials in parts by weight: 7-10 parts of carbendazim, 4-6 parts of mancozeb, 5-7 parts of chlorothalonil, 1-3 parts of benlate emulsifiable concentrate, 2-4 parts of Bordeaux mixture, 3-5 parts of antibacterial net, 160-200 parts of water, 22-30 parts of isatis root, 18-25 parts of coptis root, 26-30 parts of purslane, 10-14 parts of dandelion, 11-15 parts of isatis indigotica leaf, 7-10 parts of amomum villosum, and 10-15 parts of fennel.

[0009] As a further solution of the present invention, the raw materials are as follows: 9 parts of carbendazim, 5 parts of mancozeb, 6 parts of chlorothalonil, 2 parts of benlate emulsifiable concentrate, 3 parts of Bordeaux mixture, 4 parts of antibacterial net, 180 parts of water, 26 parts of isatis root, 21 parts of coptis root, 28 parts of purslane, 12 parts of dandelion, 13 parts of isatis indigotica leaf, 9 parts of amomum villosum, and 12 parts of fennel.

[0010] A method for preparing a biopesticide for effectively preventing and treating asparagus stem blight comprises the following steps:

[0011] S1: Weigh carbendazim, mancozeb, chlorothalonil, benlate emulsifiable concentrate, Bordeaux mixture, and antibacterial agent according to weight, mix them together, and add water to fully dissolve them to obtain a mixed solution A;

[0012] S2: Weigh the raw materials of Radix Isatidis, Rhizoma Coptidis, Herba Portulacae, Herba Taraxaci, Folium Isatidis, Folium Amomi, and Fennel by weight, wash them thoroughly, drain them, add water to mix them, heat the water to boiling, reduce the heat and simmer, filter and extract after simmering to obtain extract B;

[0013] S3: Pour the extract B obtained in S2 into the mixed solution A obtained in S1 and stir them thoroughly to obtain a biological pesticide that is highly effective in preventing and controlling asparagus stem blight.

[0014] As a further solution of the present invention: in S1 and S2, the amount of water added is 50% of the total water amount.

[0015] As a further solution of the present invention: in S2, the extracted drug residue is filtered and subjected to secondary extraction, and the extracted drug residue is subjected to repeated extraction steps of S2, thereby achieving secondary extraction of drug components, which is conducive to full utilization of the drug.

[0016] As a further solution of the present invention: in S2, the temperature of the low-fire cooking is 50-60° C., and the duration of the low-fire cooking is 20-30 minutes.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The invention adds an extract B extracted from Chinese herbal medicines such as Radix Isatidis, Rhizoma Coptidis, Herba Portulacae, Herba Taraxaci, Folium Isatidis, Folium Amomi and Fennel to the chemical agents carbendazim, mancozeb, chlorothalonil, benlate emulsifiable concentrate, Bordeaux mixture and antibacterial net, thereby finally obtaining a biological pesticide for effectively preventing and treating asparagus stem blight, avoiding the reduction of the prevention and treatment effect of asparagus stem blight by using only chemical agents for a long time. Experimental data show that the biological pesticide for effectively preventing and treating asparagus stem blight prepared by the invention can effectively prevent and treat asparagus stem blight, greatly increases the prevention and treatment effect of asparagus stem blight, is conducive to the healthy growth of asparagus and is conducive to practical use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The process flow chart of the preparation method of the biological pesticide for effectively preventing and controlling asparagus stem blight. DETAILED DESCRIPTION

[0020] Various exemplary embodiments, features, and aspects of the present application will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise indicated.

[0021] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0022] In addition, numerous specific details are provided in the following specific examples to better illustrate the present application. Those skilled in the art will appreciate that the present application can be practiced without certain specific details. In some instances, methods, means, and components well known to those skilled in the art are not described in detail in order to highlight the main purpose of the present application.

[0023] Example 1

[0024] A biological pesticide for effectively preventing and treating asparagus stem blight comprises the following raw materials in parts by weight: 5 parts of carbendazim, 3 parts of mancozeb, 5 parts of chlorothalonil, 1 part of benlate emulsifiable concentrate, 1 part of Bordeaux mixture, 2 parts of antibacterial net, 150 parts of water, 20 parts of isatis root, 15 parts of coptis root, 25 parts of purslane, 10 parts of dandelion, 10 parts of isatis indigotica leaf, 5 parts of amomum villosum, and 8 parts of fennel.

[0025] See also Figure 1 A method for preparing a biopesticide for effectively preventing and treating asparagus stem blight comprises the following steps:

[0026] S1: Weigh carbendazim, mancozeb, chlorothalonil, benlate emulsifiable concentrate, Bordeaux mixture, and antibacterial agent according to weight, mix them together, and add water to fully dissolve them to obtain a mixed solution A;

[0027] S2: The raw materials of radix bupleuri, rhizoma coptidis, herba portulacae, herba taraxaci, folium isatidis, fructus amomi, and fructus anisi are weighed by weight parts, washed and drained, mixed together, heated to boiling, and then simmered on a small fire. After simmering, the mixture is filtered to obtain extract B;

[0028] S3: The extract B obtained in S2 is poured into the mixed liquid A obtained in S1, and stirred thoroughly to obtain a biological pesticide for preventing and treating asparagus stem blight.

[0029] Preferably, in this embodiment, the amount of water added in S1 and S2 is 50% of the total water amount, and the temperature for simmering on a small fire in S2 is 50-60°C, and the time for simmering on a small fire is 20-30 min.

[0030] Preferably, in this embodiment, the drug residue obtained by filtering in S2 is subjected to secondary extraction, and the extracted drug residue is subjected to the extraction step of S2 again to realize secondary extraction of the drug components, which is beneficial to the full use of the drug.

[0031] Experiment 1

[0032] 150 asparagus plants of the same soil and the same period of disease are selected and divided into three groups, each group of 50 plants, which are respectively an experimental group, a control group, and a blank group. The experimental group is sprayed with the biological pesticide for preventing and treating asparagus stem blight prepared in this embodiment, twice a day in the morning and evening, for 3 days. The control group is sprayed with a chemical pesticide obtained by mixing water with chemical agents carbendazim, mancozeb, chlorothalonil, benlate emulsion, bordeaux mixture, and bacto-agar, twice a day in the morning and evening, for 3 days. The blank group is not treated. The conditions of the diseased asparagus plants are observed 5 days, 10 days, and 15 days after spraying the pesticide, as shown in the following table:

[0033] Days Number of asparagus plants with disease in the experimental group Number of asparagus plants with disease in the control group Number of asparagus plants with disease in the blank group 5 31 45 50 10 23 40 49 15 12 38 49

[0034] Conclusion: The biological pesticide for preventing and treating asparagus stem blight prepared in this embodiment has a certain effect on preventing and treating asparagus stem blight in the experimental group, and the chemical agents used in the control group also have a certain effect on preventing and treating asparagus stem blight. Compared with the control group, the biological pesticide for preventing and treating asparagus stem blight prepared in this embodiment has a better effect on preventing and treating asparagus stem blight, and the blank group has no obvious effect on preventing and treating asparagus stem blight.

[0035] Example 2

[0036] A kind of biological pesticide for preventing and treating asparagus stem blight efficiently, comprising the following raw materials by weight parts: carbendazim 10 parts, mancozeb 6 parts, chlorothalonil 8 parts, benlate emulsion 5 parts, bordeaux mixture 4 parts, bacto 5 parts, water 200 parts, radix isatidis 30 parts, coptis 25 parts, purslane 30 parts, dandelion 15 parts, indigoleaf 15 parts, amomum villosum 10 parts, fennel 15 parts.

[0037] Please refer to Figure 1 A kind of preparation method of biological pesticide for preventing and treating asparagus stem blight efficiently, comprising the following steps:

[0038] S1: the raw material carbendazim, mancozeb, chlorothalonil, benlate emulsion, bordeaux mixture, bacto are weighed by weight parts, which are mixed together, and water is added to fully dissolve, to obtain mixed solution A;

[0039] S2: radix isatidis, coptis, purslane, dandelion, indigoleaf, amomum villosum, fennel are weighed by weight parts, which are washed clean and drained, and then mixed together with water, heated to boiling, and then small fire is used for decocting, and after decocting is completed, it is filtered and extracted to obtain extract B;

[0040] S3: the extract B obtained in S2 is poured into the mixed solution A obtained in S1, and is fully stirred, to obtain the biological pesticide for preventing and treating asparagus stem blight efficiently.

[0041] Preferably, in this embodiment, in S1, S2, the amount of water added is 50% of the total water amount, and in S2, the temperature of small fire decocting is 50-60 DEG C, and the time of small fire decocting is 20-30 min.

[0042] Preferably, in this embodiment, in S2, the drug residue of filtering and extracting is extracted twice, and the extracted drug residue is repeated the extraction step of S2, so that the secondary extraction of drug components is realized, which is beneficial to the full use of drugs.

[0043] Experiment two

[0044] Select 150 asparagus plants of the same land and the same period of disease, and divide them into three groups, 50 plants each, which are experimental group, control group and blank group respectively, the experimental group is sprayed with the biological pesticide for preventing and treating asparagus stem blight prepared in this embodiment, 2 times a day, for 3 days, the control group is sprayed with the chemical pesticide obtained by mixing chemical agents carbendazim, mancozeb, chlorothalonil, benlate emulsion, bordeaux mixture, bacto with water, 2 times a day, for 3 days, and the blank group is not treated, and the conditions of asparagus plants after spraying pesticide are observed 5 days, 10 days and 15 days respectively, as shown in the following table:

[0045] Days Number of asparagus plants with disease in the experimental group Number of asparagus plants with disease in the control group Number of asparagus plants with disease in the blank group 5 28 44 50 10 18 38 50 15 7 38 50

[0046] Conclusion: The biological pesticide for preventing and controlling asparagus stem blight prepared in this example in the experimental group has a certain effect in preventing and controlling asparagus stem blight, and the chemical agent used in the control group also has a certain effect in preventing and controlling asparagus stem blight. Compared with the control group, the biological pesticide for preventing and controlling asparagus stem blight prepared in this example has a better effect in preventing and controlling asparagus stem blight, while the blank group has no obvious effect on preventing and controlling asparagus stem blight.

[0047] Example 3

[0048] A biological pesticide for effectively preventing and treating asparagus stem blight comprises the following raw materials in parts by weight: 7 parts of carbendazim, 4 parts of mancozeb, 5 parts of chlorothalonil, 1 part of benlate emulsifiable concentrate, 2 parts of Bordeaux mixture, 3 parts of antibacterial net, 160 parts of water, 22 parts of isatis root, 18 parts of coptis root, 26 parts of purslane, 10 parts of dandelion, 11 parts of isatis indigotica leaf, 7 parts of amomum villosum, and 10 parts of fennel.

[0049] See also Figure 1 A method for preparing a biopesticide for effectively preventing and treating asparagus stem blight comprises the following steps:

[0050] S1: Weigh carbendazim, mancozeb, chlorothalonil, benlate emulsifiable concentrate, Bordeaux mixture, and antibacterial agent according to weight, mix them together, and add water to fully dissolve them to obtain a mixed solution A;

[0051] S2: Weigh the raw materials of Radix Isatidis, Rhizoma Coptidis, Herba Portulacae, Herba Taraxaci, Folium Isatidis, Folium Amomi, and Fennel by weight, wash them thoroughly, drain them, add water to mix them, heat the water to boiling, reduce the heat and simmer, filter and extract after simmering to obtain extract B;

[0052] S3: Pour the extract B obtained in S2 into the mixed solution A obtained in S1 and stir them thoroughly to obtain a biological pesticide that is highly effective in preventing and controlling asparagus stem blight.

[0053] Preferably, in this embodiment, in S1 and S2, the amount of water added is 50% of the total water volume respectively; in S2, the temperature for simmering over low heat is 50-60°C, and the time for simmering over low heat is 20-30 minutes.

[0054] Preferably, in this embodiment, in S2, the filtered extracted drug residue is subjected to secondary extraction, and the extracted drug residue is subjected to repeated extraction steps of S2, thereby achieving secondary extraction of drug components, which is conducive to full utilization of the drug.

[0055] Experiment 3

[0056] 150 asparagus plants that were diseased in the same land and at the same time were selected and divided into three groups, each with 50 plants, namely an experimental group, a control group, and a blank group. The experimental group was sprayed with the biological pesticide for preventing and treating asparagus stem blight prepared in this example, twice a day in the morning and evening for 3 days. The control group was sprayed with a chemical pesticide obtained by mixing carbendazim, mancozeb, chlorothalonil, benlate emulsifiable concentrate, Bordeaux mixture, and antibacterial net with water, twice a day in the morning and evening for 3 days. The blank group was not treated in any way. The diseased asparagus plants were observed 5 days, 10 days, and 15 days after spraying, as shown in the following table:

[0057] Days Number of asparagus plants with disease in the experimental group Number of asparagus plants with disease in the control group Number of asparagus plants with disease in the blank group 5 29 46 50 10 20 37 50 15 12 35 49

[0058] Conclusion: The biological pesticide for preventing and controlling asparagus stem blight prepared in this example in the experimental group has a certain effect in preventing and controlling asparagus stem blight, and the chemical agent used in the control group also has a certain effect in preventing and controlling asparagus stem blight. Compared with the control group, the biological pesticide for preventing and controlling asparagus stem blight prepared in this example has a better effect in preventing and controlling asparagus stem blight, while the blank group has no obvious effect on preventing and controlling asparagus stem blight.

[0059] Example 4

[0060] A biological pesticide for effectively preventing and treating asparagus stem blight comprises the following raw materials in parts by weight: 10 parts of carbendazim, 6 parts of mancozeb, 7 parts of chlorothalonil, 3 parts of benlate emulsifiable concentrate, 4 parts of Bordeaux mixture, 5 parts of antibacterial net, 200 parts of water, 30 parts of isatis root, 25 parts of coptis root, 30 parts of purslane, 14 parts of dandelion, 15 parts of isatis indigotica leaf, 10 parts of amomum villosum, and 15 parts of fennel.

[0061] See also Figure 1 A method for preparing a biopesticide for effectively preventing and treating asparagus stem blight comprises the following steps:

[0062] S1: Weigh carbendazim, mancozeb, chlorothalonil, benlate emulsifiable concentrate, Bordeaux mixture, and antibacterial agent according to weight, mix them together, and add water to fully dissolve them to obtain a mixed solution A;

[0063] S2: Weigh the raw materials of Radix Isatidis, Rhizoma Coptidis, Herba Portulacae, Herba Taraxaci, Folium Isatidis, Folium Amomi, and Fennel by weight, wash them thoroughly, drain them, add water to mix them, heat the water to boiling, reduce the heat and simmer, filter and extract after simmering to obtain extract B;

[0064] S3: Pour the extract B obtained in S2 into the mixed solution A obtained in S1 and stir them thoroughly to obtain a biological pesticide that is highly effective in preventing and controlling asparagus stem blight.

[0065] Preferably, in this embodiment, the amount of water added in S1 and S2 is 50% of the total amount of water, and the temperature of the small fire decoction in S2 is 50-60℃, and the duration of the small fire decoction is 20-30min.

[0066] Preferably, in this embodiment, in S2, the extracted drug residue is filtered and subjected to secondary extraction, and the extracted drug residue is subjected to the extraction step of S2 repeatedly, so that the secondary extraction of the drug components is realized, which is beneficial to the full utilization of the drug.

[0067] Experiment four

[0068] Select 150 asparagus plants of the same land and the same period of disease, and divide them into three groups, 50 plants in each group, namely the experimental group, the control group and the blank group. The experimental group is sprayed with the biological pesticide prepared in this embodiment for preventing and treating asparagus stem blight, 2 times a day, for 3 days. The control group is sprayed with the chemical pesticide obtained by mixing carbendazim, mancozeb, chlorothalonil, benlate emulsion, bordeaux mixture and bacteriostatic net with water, 2 times a day, for 3 days. The blank group is not treated. The conditions of the diseased asparagus plants are observed 5 days, 10 days and 15 days after spraying the pesticide, as shown in the following table:

[0069] Days Number of asparagus plants with disease in the experimental group Number of asparagus plants with disease in the control group Number of asparagus plants with disease in the blank group 5 20 43 49 10 15 43 49 15 7 42 49

[0070] Conclusion: The biological pesticide prepared in this embodiment for preventing and treating asparagus stem blight has a certain effect on preventing and treating asparagus stem blight in the experimental group, and the chemical pesticide used in the control group also has a certain effect on preventing and treating asparagus stem blight. Compared with the control group, the biological pesticide prepared in this embodiment for preventing and treating asparagus stem blight has better effect on preventing and treating asparagus stem blight, and the blank group has no obvious effect on preventing and treating asparagus stem blight.

[0071] Example five

[0072] A biological pesticide for preventing and treating asparagus stem blight efficiently, comprising the following raw materials in parts by weight: carbendazim 9 parts, mancozeb 5 parts, chlorothalonil 6 parts, benlate emulsion 2 parts, bordeaux mixture 3 parts, bacteriostatic net 4 parts, water 180 parts, radix isatidis 26 parts, rhizoma coptidis 21 parts, portulaca oleracea 28 parts, herba taraxaci 12 parts, folium isatidis 13 parts, amomum villosum 9 parts, and cuminum 12 parts.

[0073] Please refer to Figure 1 A preparation method of a biological pesticide for preventing and treating asparagus stem blight efficiently, comprising the following steps:

[0074] S1: weigh the raw materials carbendazim, mancozeb, chlorothalonil, benlate emulsion, bordeaux mixture and bacteriostatic net according to the weight parts, mix them together, and add water to fully dissolve, to obtain a mixed solution A;

[0075] S2: Weigh the raw materials of Radix Isatidis, Rhizoma Coptidis, Herba Portulacae, Herba Taraxaci, Folium Isatidis, Folium Amomi, and Fennel by weight, wash them thoroughly, drain them, add water to mix them, heat the water to boiling, reduce the heat and simmer, filter and extract after simmering to obtain extract B;

[0076] S3: Pour the extract B obtained in S2 into the mixed solution A obtained in S1 and stir them thoroughly to obtain a biological pesticide that is highly effective in preventing and controlling asparagus stem blight.

[0077] Preferably, in this embodiment, in S1 and S2, the amount of water added is 50% of the total water volume respectively; in S2, the temperature for simmering over low heat is 50-60°C, and the time for simmering over low heat is 20-30 minutes.

[0078] Preferably, in this embodiment, in S2, the filtered extracted drug residue is subjected to secondary extraction, and the extracted drug residue is subjected to repeated extraction steps of S2, thereby achieving secondary extraction of drug components, which is conducive to full utilization of the drug.

[0079] Experiment 5

[0080] 150 asparagus plants that were diseased in the same land and at the same time were selected and divided into three groups, each with 50 plants, namely an experimental group, a control group, and a blank group. The experimental group was sprayed with the biological pesticide for preventing and treating asparagus stem blight prepared in this example, twice a day in the morning and evening for 3 days. The control group was sprayed with a chemical pesticide obtained by mixing carbendazim, mancozeb, chlorothalonil, benlate emulsifiable concentrate, Bordeaux mixture, and antibacterial net with water, twice a day in the morning and evening for 3 days. The blank group was not treated in any way. The diseased asparagus plants were observed 5 days, 10 days, and 15 days after spraying, as shown in the following table:

[0081] Days Number of asparagus plants with disease in the experimental group Number of asparagus plants with disease in the control group Number of asparagus plants with disease in the blank group Figure 1 Days Number of asparagus plants with disease in the experimental group Number of asparagus plants with disease in the control group Number of asparagus plants with disease in the blank group 5 15 46 50 10 8 42 50 15 1 42 50

[0082] Conclusion: The biological pesticide for preventing and controlling asparagus stem blight prepared in this example in the experimental group has a certain effect in preventing and controlling asparagus stem blight, and the chemical agent used in the control group also has a certain effect in preventing and controlling asparagus stem blight. Compared with the control group, the biological pesticide for preventing and controlling asparagus stem blight prepared in this example has a better effect in preventing and controlling asparagus stem blight, while the blank group has no obvious effect on preventing and controlling asparagus stem blight.

[0083] In summary, among Examples 1 to 5, the experimental group of Example 5 has the best effect on preventing and treating asparagus stem blight. Therefore, Example 5 is the most optimal example of the present invention.

[0084] Experimental data show that the biological pesticide for efficiently preventing and controlling asparagus stem blight prepared by the present invention can effectively prevent and control asparagus stem blight, greatly increases the prevention and control effect of asparagus stem blight, is beneficial to the healthy growth of asparagus, and is beneficial to practical use.

[0085] It should be specifically explained that the present invention adds an extract B extracted from Chinese herbal medicines such as Radix Isatidis, Rhizoma Coptidis, Herba Portulacae, Herba Taraxaci, Folium Isatidis, Folium Amomi, and Fennel to the chemical agents carbendazim, mancozeb, chlorothalonil, benlate emulsifiable concentrate, Bordeaux mixture, and antibacterial agent, thereby ultimately obtaining a biological pesticide for effectively preventing and treating asparagus stem blight. This avoids the reduction in the prevention and treatment effect of asparagus stem blight caused by long-term use of only chemical agents, can effectively and efficiently prevent and treat asparagus stem blight, greatly increases the prevention and treatment effect of asparagus stem blight, is conducive to the healthy growth of asparagus, and is conducive to practical use.

[0086] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein.

[0087] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A biopesticide for effectively preventing and treating asparagus stem blight, characterized in that: The invention comprises the following raw materials in parts by weight: 5-10 parts of carbendazim, 3-6 parts of mancozeb, 5-8 parts of chlorothalonil, 1-5 parts of benlate emulsifiable concentrate, 1-4 parts of Bordeaux mixture, 2-5 parts of antibacterial net, 150-200 parts of water, 20-30 parts of isatis root, 15-25 parts of coptis root, 25-30 parts of purslane, 10-15 parts of dandelion, 10-15 parts of isatis indigotica leaf, 5-10 parts of amomum villosum and 8-15 parts of fennel.

2. The biopesticide for efficiently preventing and treating asparagus stem blight according to claim 1, characterized in that: The invention comprises the following raw materials in parts by weight: 7-10 parts of carbendazim, 4-6 parts of mancozeb, 5-7 parts of chlorothalonil, 1-3 parts of benlate emulsifiable concentrate, 2-4 parts of Bordeaux mixture, 3-5 parts of antibacterial net, 160-200 parts of water, 22-30 parts of isatis root, 18-25 parts of coptis root, 26-30 parts of purslane, 10-14 parts of dandelion, 11-15 parts of isatis indigotica leaf, 7-10 parts of amomum villosum and 10-15 parts of fennel.

3. The biopesticide for efficiently preventing and treating asparagus stem blight according to claim 2, characterized in that: The invention comprises the following raw materials in parts by weight: 9 parts of carbendazim, 5 parts of mancozeb, 6 parts of chlorothalonil, 2 parts of benlate emulsifiable concentrate, 3 parts of Bordeaux mixture, 4 parts of antibacterial net, 180 parts of water, 26 parts of isatis root, 21 parts of coptis root, 28 parts of purslane, 12 parts of dandelion, 13 parts of isatis indigotica leaf, 9 parts of amomum villosum and 12 parts of fennel.

4. A method for preparing a biopesticide for effectively preventing and treating asparagus stem blight according to any one of claims 1 to 3, characterized in that: The following steps are involved: S1: Weigh carbendazim, mancozeb, chlorothalonil, benlate emulsifiable concentrate, Bordeaux mixture, and antibacterial agent according to weight, mix them together, and add water to fully dissolve them to obtain a mixed solution A; S2: Weigh the raw materials of Radix Isatidis, Rhizoma Coptidis, Herba Portulacae, Herba Taraxaci, Folium Isatidis, Folium Amomi, and Fennel by weight, wash them thoroughly, drain them, add water to mix them, heat the water to boiling, reduce the heat and simmer, filter and extract after simmering to obtain extract B; S3: Pour the extract B obtained in S2 into the mixed solution A obtained in S1 and stir them thoroughly to obtain a biological pesticide that is highly effective in preventing and controlling asparagus stem blight.

5. The method for preparing the biopesticide for efficiently preventing and treating asparagus stem blight according to claim 4, characterized in that: In S1 and S2, the amount of water added is 50% of the total water amount.

6. The method for preparing the biopesticide for efficiently preventing and treating asparagus stem blight according to claim 5, characterized in that: In S2, the extracted drug residue is filtered and subjected to secondary extraction. The extracted drug residue is subjected to repeated extraction steps of S2, thereby achieving secondary extraction of drug components, which is conducive to full utilization of the drug.

7. The method for preparing the biopesticide for efficiently preventing and treating asparagus stem blight according to claim 5, characterized in that: In S2, the temperature of the low-fire cooking is 50-60° C., and the duration of the low-fire cooking is 20-30 minutes.

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