Macleaya cordata alkaloid suspending agent for preventing and treating tea geometrid of tea tree and preparation method of macleaya cordata alkaloid suspending agent

Abstract

The invention belongs to the technical field of pesticides, and particularly relates to a macleaya cordata alkaloid suspending agent for preventing and treating tea geometrid of tea trees and a preparation method of the macleaya cordata alkaloid suspending agent. The macleaya cordata alkaloid suspending agent for preventing and treating tea geometrid of tea trees comprises the following components in percentage by weight: 5%-50% of macleaya cordata alkaloid, 1%-10% of tea saponin, 1%-10% of a dispersing agent, 1%-10% of an anti-freezing agent, 0.05%-2% of a thickening agent, 0.05%-0.5% of a defoaming agent, 0.01%-0.1% of a preservative and the balance of deionized water. After the macleaya cordata alkaloid and the tea saponin are mixed, the synergistic effect is obvious, alkaloid particles in the suspending agent are fine, can rapidly permeate into plant tissues to play a lasting pesticide effect, and have a remarkable insecticidal effect on tea geometrid, and the tea geometrid is not prone to generating drug resistance to the suspending agent. The pesticide is a botanical pesticide, no dust is generated in the application process, the pollution of the pesticide to the environment is small, the required materials are easy to obtain, and the industrial production cost is low.

Description

[0001] The invention belongs to the technical field of pesticides, and particularly relates to a Macleaya cordata alkaloid suspension concentrate for preventing and controlling tea geometrids and a preparation method thereof. Background Art

[0002] The tea geometre is a major pest of tea trees. Its larvae feed on both young and mature leaves, leaving tea bushes bare and severely impacting tea yield and quality. Traditional control methods rely on chemical pesticides, but long-term use not only pollutes the environment and creates pesticide residues, but also fosters pest resistance and disrupts ecological balance.

[0003] Macleaya cordata alkaloids are a natural plant extract with insecticidal activity. Its main components include sanguinarine and chelerythrine, etc., which have been proven to have control effects on a variety of pests. However, the application of Macleaya cordata alkaloids in the control of tea leaf moths is not yet widespread, and there is a lack of efficient formulations. Among them, the patent document "A plant-derived synergistic compound insecticide containing matrine and Macleaya cordata alkaloids and its preparation method" with application number CN201210018984 discloses a plant-derived synergistic compound insecticide. The prepared plant-derived synergistic compound insecticide is composed of matrine and Macleaya cordata alkaloids as the main components and is compounded with adjuvants. It is mainly used to control agricultural pests such as aphids and red spiders on melons, fruits and vegetables. It is formulated by weight percentage, and the concentration of Macleaya cordata alkaloids used is 0.1 to 20%. However, the 3-day, 7-day and 10-day control effects on various pests cannot reach 100%, and there is no relevant report on the control effect of the invention on tea geometrids.

[0004] Tea saponin is a natural nonionic surfactant with excellent emulsifying, dispersing, foaming, and wetting properties. It is an excellent adjuvant for various pesticide formulations and can also be used directly as a biopesticide. When mixed with other pesticides, it has a strong toxic and synergistic effect against a variety of pests. To enhance the efficacy of Macleaya cordata alkaloids in controlling tea loopers (Geometritis elegans) and expand the pest control spectrum of Macleaya cordata alkaloids, the present invention has designed a synergistic combination of tea saponin and Macleaya cordata alkaloids, aiming to develop a long-lasting, highly effective, and environmentally friendly agent for controlling tea loopers (Geometritis elegans). Summary of the Invention

[0005] The present invention addresses the deficiencies of the prior art and provides a Macleaya cordata alkaloid suspension concentrate for controlling tea leaf moth and a preparation method thereof to achieve the technical purpose of the present invention.

[0006] This is achieved specifically through the following technical solutions:

[0007] The first object of the present invention is to provide: a Macleaya cordata alkaloid suspension for controlling tea leaf moth, comprising the following components by weight: Macleaya cordata alkaloid: 5% to 50%, tea saponin: 1% to 10%, dispersant: 1% to 10%, antifreeze: 1% to 10%, thickener: 0.05% to 2%, defoaming agent: 0.05% to 0.5%, preservative: 0.01% to 0.1%, and the balance being deionized water.

[0008] The mass ratio of Macleaya cordata alkaloids to tea saponin in the Macleaya cordata alkaloid suspension for preventing and controlling tea leaf moth is 5:1.

[0009] The dispersant is one or more of lignin and its derivative sulfonates, sodium dodecylbenzenesulfonate, calcium dodecylbenzenesulfonate, naphthalene and alkylnaphthalene formaldehyde condensate sulfonates, fatty acid methyl ester sulfonates, alkylphenol polyoxyethylene ether sulfonates, fatty alcohol ethylene oxide adduct sulfonates, alkylphenol polyoxyethylene ether sulfonates, polycarboxylates, phosphates, sulfates, polyoxyethylene polyoxypropylene ether block copolymers, alkylphenol polyoxyethylene phosphates, carboxymethyl cellulose, polyvinyl alcohol, polyvinyl pyrrolidone, sodium polyacrylate, xanthan gum, castor oil polyoxyethylene ether, and agricultural milk dispersants.

[0010] The defoaming agent is one or more of C10-20 fatty acid, C8-10 fatty alcohol, coconut acid EO-PO polymer, and polyoxyethylene glycerol ether.

[0011] The preservative is one or more of sodium benzoate, sodium salicylate, propionic acid, sorbic acid and sodium salts thereof.

[0012] The antifreeze agent is one or more of ethylene glycol, polyethylene glycol, propylene glycol, glycerol, diethylene glycol, triethylene glycol, sorbitol, sodium chloride, and urea.

[0013] The thickener is one or more of gelatin, xanthan gum, styrene-butadiene latex, gum arabic, bentonite, magnesium aluminum silicate, sodium alginate, sodium carboxymethyl cellulose, hydroxyethyl cellulose, sodium carboxypropyl cellulose, polyethylene oxide, polyethyl acetate, polyacrylamide, modified starch, dextrin, polyvinyl acetate, and naphthol-formaldehyde resin.

[0014] The second object of the present invention is to provide a method for preparing the Macleaya cordata alkaloid suspension concentrate for controlling tea leaf moth, which is characterized by comprising the following steps:

[0015] (1) Weighing and preparing materials

[0016] Weigh the macleaya alkaloids, tea saponin, dispersant, defoamer and preservative according to the proportions and mix with deionized water;

[0017] (2) Pre-dispersion and sand grinding

[0018] The mixture obtained in step (1) is added to a sand mill for pre-dispersion, and then sand milling is performed by adding sand milling media;

[0019] (3) Modulation

[0020] Add a thickener and an antifreeze agent to the product obtained in step (2) in sequence, and stir evenly to obtain a homogeneous suspension;

[0021] (4) Packaging

[0022] The prepared suspension is packaged to obtain the finished product.

[0023] The pre-dispersion time is 5 to 15 minutes, and the sand milling time is 0.5 to 1.5 hours.

[0024] Beneficial effects

[0025] The Macleaya cordata alkaloid suspension concentrate for controlling tea leafhoppers, protected by the present invention, is prepared using Macleaya cordata alkaloids and tea saponin as the main active ingredients, supplemented with a dispersant, antifreeze, thickener, defoamer, and preservative, and using deionized water as a solution. This agent has the following beneficial effects:

[0026] 1. Highly effective insecticide: After mixing Macleaya cordata alkaloids and tea saponins, the synergistic effect is obvious, which has a significant insecticidal effect on tea loopers. Tea loopers are not easy to develop resistance to it, so it has long-term prevention and control capabilities.

[0027] 2. Long-lasting efficacy: The alkaloid particles in the suspension are small and can quickly penetrate into the plant tissues to exert long-lasting efficacy.

[0028] 3. Enhanced control effect: It can improve the control effect of pesticides, avoid the shortcomings of a single pesticide such as narrow insecticide spectrum, insufficient persistence, and relatively low control effect. After mixing, the mixed synergistic effect of the pesticides can be fully exerted to expand the pest control spectrum.

[0029] 4. Environmentally friendly: The present invention is a plant-derived pesticide. The prepared agent is highly effective against tea loopers, kills them thoroughly, generates no dust, is environmentally friendly, and has little pollution to the environment.

[0030] 5. Low production cost: The present invention is plant-derived, the required materials are easy to obtain, and the industrial production cost is low. DETAILED DESCRIPTION

[0031] Example 1-Example 12

[0032] Examples 1-12 were prepared using the following method to prepare a Macleaya cordata alkaloid suspension concentrate for controlling tea leafhoppers:

[0033] The preparation method includes the following:

[0034] (1) Weighing and preparing materials

[0035] Accurately weighing the Macleaya cordata alkaloids, tea saponin, a dispersant, a defoaming agent, a preservative, a thickener, an antifreeze agent, and deionized water; after weighing according to a ratio, mixing the Macleaya cordata alkaloids, tea saponin, a dispersant, a defoaming agent, a preservative, and deionized water to obtain a mixed slurry;

[0036] (2) Pre-dispersion and sand grinding

[0037] The mixed slurry was added to a sand mill and pre-dispersed for 10 minutes, and then a sand milling medium was added and sand milled for 1 hour to obtain a dispersed slurry;

[0038] (3) Modulation

[0039] Adding a thickener and an antifreeze agent in proportion to the dispersed slurry in sequence, stirring evenly, to obtain a homogeneous suspension, which is the Macleaya cordata alkaloid suspension concentrate for controlling tea leafworms;

[0040] (4) Packaging

[0041] The prepared suspension is packaged to obtain the finished product.

[0042] The dispersant used in this embodiment is carboxymethyl cellulose; the defoaming agent is C10 fatty acid, the preservative is sodium benzoate, the antifreeze agent is glycerol, and the thickener is xanthan gum.

[0043] In Examples 1 to 12, the weight percentages of the components in the suspending agent are shown in Table 1:

[0044] Table 1 Weight percentage of each component in the suspending agent

[0045]

[0046]

[0047]

[0048] The suspension concentrates prepared according to Examples 1 to 12 were used for field efficacy tests. The specific test method was as follows: Each agent was prepared into a solution of the required concentration, with water as the control. Each treatment was repeated 3 times in a randomized block design with a plot area of 20 m2. 2 The spraying rate was 750 kg per hectare using a Gongnong-16 backpack sprayer. Each plot was divided into east, west, south, north and middle sampling points with an area of 1 m 2 Before applying the pesticide, check the insect population base and check the number of live insects 3 days after applying the pesticide. The control effect was calculated using the Abbot formula. The control results are shown in Table 2:

[0049] Table 2 Number of live worms 3 days after application of the drug

[0050]

[0051] It can be seen from Examples 1 to 4 that increasing the concentration of the dispersant is beneficial to improving the pest killing effect. This may be because the addition of high-concentration dispersant makes the agent more homogenized and improves the synergistic effect of the ingredients in the agent.

[0052] It can be seen from Examples 1, 3, and 5 to 12 that as the concentrations of Macleaya cordata alkaloids and tea saponins increase, the insecticide's pest-killing effect gradually improves. Field efficacy tests show that the use of the Macleaya cordata alkaloid suspension concentrate for controlling tea leafhoppers has a significant control effect on tea leafhoppers, achieving a 100% insect population reduction rate in 3 days. According to on-site observation results, the use of the Macleaya cordata alkaloid suspension concentrate for controlling tea leafhoppers has no adverse effects on tea tree growth.

[0053] In addition, the present invention screened the suspension agent excipients (dispersant, defoamer, preservative, thickener, antifreeze), and the results showed that:

[0054] One or more of lignin and its derivative sulfonates, sodium dodecylbenzenesulfonate, calcium dodecylbenzenesulfonate, naphthalene and alkylnaphthalene formaldehyde condensate sulfonates, fatty acid methyl ester sulfonates, alkylphenol polyoxyethylene ether sulfonates, fatty alcohol ethylene oxide adduct sulfonates, alkylphenol polyoxyethylene ether sulfonates, polycarboxylates, phosphates, sulfates, polyoxyethylene polyoxypropylene ether block copolymers, alkylphenol polyoxyethylene phosphates, carboxymethyl cellulose, polyvinyl alcohol, polyvinyl pyrrolidone, sodium polyacrylate, xanthan gum, castor oil polyoxyethylene ether, and agricultural milk dispersants can be used as dispersants with comparable dispersion effects.

[0055] C10-20 fatty acids, C8-10 fatty alcohols, coconut acid EO-PO polymers, and polyoxyethylene glycerol ethers can all be used as defoaming agents with no significant difference in effect.

[0056] Sodium benzoate, sodium salicylate, propionic acid, sorbic acid and their sodium salts can all be used as preservatives with no significant difference in effect.

[0057] Ethylene glycol, polyethylene glycol, propylene glycol, glycerin, diethylene glycol, triethylene glycol, sorbitol, sodium chloride, and urea can be used as antifreeze agents with no significant difference in effect.

[0058] Gelatin, xanthan gum, styrene-butadiene latex, gum arabic, bentonite, magnesium aluminum silicate, sodium alginate, sodium carboxymethyl cellulose, hydroxyethyl cellulose, sodium carboxypropyl cellulose, polyethylene oxide, polyethyl acetate, polyacrylamide, modified starch, dextrin, polyvinyl acetate, and naphthol-formaldehyde resin can be used as thickeners with no significant difference in effect.

[0059] The above-mentioned excipients can be arbitrarily combined after being independently selected, and no adverse effects on the synergistic effect of Macleaya cordata alkaloids and tea saponins were found, so the above-mentioned excipients are also within the protection scope of the present invention.

[0060] Although the present invention has been disclosed above with reference to preferred embodiments, this is not intended to limit the present invention. Any researcher in this field may, without departing from the spirit and scope of the present invention, adopt the design parameters and contents of the above-disclosed embodiments to change and modify the research scheme of the present invention. Therefore, any simple modifications, parameter changes, and modifications made to the above-disclosed embodiments based on the research essence of the present invention without departing from the content of the present invention are within the scope of protection of the present invention.

Claims

1. A Macleaya cordata alkaloid suspension concentrate for controlling tea leaf moth, characterized in that: The invention comprises the following components by weight percentage: 5% to 50% of macleya alkaloids, 1% to 10% of tea saponin, 1% to 10% of dispersant, 1% to 10% of antifreeze agent, 0.05% to 2% of thickener, 0.05% to 0.5% of defoaming agent, 0.01% to 0.1% of preservative, and the balance is deionized water.

2. The Macleaya cordata alkaloid suspension concentrate for preventing and treating tea leaf looper as claimed in claim 1, wherein: The mass ratio of Macleaya cordata alkaloids to tea saponin in the Macleaya cordata alkaloid suspension for preventing and controlling tea leaf moth is 5:

1.

3. The Macleaya cordata alkaloid suspension concentrate for preventing and treating tea leaf looper as claimed in claim 1, wherein: The dispersant is one or more of lignin and its derivative sulfonates, sodium dodecylbenzenesulfonate, calcium dodecylbenzenesulfonate, naphthalene and alkylnaphthalene formaldehyde condensate sulfonates, fatty acid methyl ester sulfonates, alkylphenol polyoxyethylene ether sulfonates, fatty alcohol ethylene oxide adduct sulfonates, alkylphenol polyoxyethylene ether sulfonates, polycarboxylates, phosphates, sulfates, polyoxyethylene polyoxypropylene ether block copolymers, alkylphenol polyoxyethylene phosphates, carboxymethyl cellulose, polyvinyl alcohol, polyvinyl pyrrolidone, sodium polyacrylate, xanthan gum, castor oil polyoxyethylene ether, and agricultural milk dispersants.

4. The Macleaya cordata alkaloid suspension concentrate for preventing and treating tea leaf looper as claimed in claim 1, wherein: The defoaming agent is one or more of C10-20 fatty acid, C8-10 fatty alcohol, coconut acid EO-PO polymer, and polyoxyethylene glycerol ether.

5. The Macleaya cordata alkaloid suspension concentrate for preventing and treating tea leaf looper as claimed in claim 1, wherein: The preservative is one or more of sodium benzoate, sodium salicylate, propionic acid, sorbic acid and sodium salts thereof.

6. The Macleaya cordata alkaloid suspension concentrate for preventing and treating tea leaf looper according to claim 1, wherein: The antifreeze agent is one or more of ethylene glycol, polyethylene glycol, propylene glycol, glycerol, diethylene glycol, triethylene glycol, sorbitol, sodium chloride, and urea.

7. The Macleaya cordata alkaloid suspension concentrate for preventing and treating tea leaf looper according to claim 1, wherein: The thickener is one or more of gelatin, xanthan gum, styrene-butadiene latex, gum arabic, bentonite, magnesium aluminum silicate, sodium alginate, sodium carboxymethyl cellulose, hydroxyethyl cellulose, sodium carboxypropyl cellulose, polyethylene oxide, polyethyl acetate, polyacrylamide, modified starch, dextrin, polyvinyl acetate, and naphthol-formaldehyde resin.

8. A method for preparing a Macleaya cordata alkaloid suspension concentrate for controlling tea leaf looper according to any one of claims 1 to 7, characterized in that: The following steps are involved: (1) Weighing and preparing materials Weigh the macleaya alkaloids, tea saponin, dispersant, defoamer and preservative according to the proportions and mix with deionized water; (2) Pre-dispersion and sand grinding The mixture obtained in step (1) is added to a sand mill for pre-dispersion, and then sand milling is performed by adding sand milling media; (3) Modulation Add a thickener and an antifreeze agent to the product obtained in step (2) in sequence, and stir evenly to obtain a homogeneous suspension; (4) Packaging The prepared suspension is packaged to obtain the finished product.

9. The method for preparing a Macleaya cordata alkaloid suspension concentrate for preventing and controlling tea geometrids as claimed in claim 8, wherein: The pre-dispersion time is 5 to 15 minutes, and the sand milling time is 0.5 to 1.5 hours.

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