Pesticide-fertilizer composition for preventing and treating spider mites and application of pesticide-fertilizer composition

Abstract

The invention discloses a pesticide-fertilizer composition for preventing and treating spider mites and application of the pesticide-fertilizer composition. The pesticide-fertilizer composition contains carvacrol, chitosan and a nano-state isolation slow-release film preparation, the nano-state isolation sustained-release film preparation comprises 5-10 parts of a modified film-forming agent, 1-5 parts of an active microemulsion, 5-10 parts of a filler and 5-10 parts of water. According to the pesticide-fertilizer composition disclosed by the invention, carvacrol, chitosan and the nano-state isolation sustained-release film preparation are combined for use, so that a remarkable synergistic effect is achieved on prevention and control of tetranychid mites, the effect is remarkably superior to that of azadirachtin and sophocarpidine which are commonly used by carvacrol or tetranychid mites independently, and the pesticide-fertilizer composition has no toxic effect on plants and can achieve the effects of promoting growth and increasing yield of the fertilizer.

Description

Technical Field

[0001] The invention relates to the technical field of pesticides and fertilizers, and in particular to a pesticide-fertilizer composition for preventing and controlling spider mites and application thereof. Background Art

[0002] Strawberry is a perennial herbaceous plant. There are more than 2,000 varieties of strawberries in the world. Strawberries are heart-shaped, juicy, and have a particularly strong fruity aroma. They are high in nutritional value and rich in vitamin C. They are known as the "Queen of Fruits". Strawberries are the main cultivated varieties in my country's protected horticulture. Compared with other varieties, their protected cultivation has the characteristics of short cycle, quick results, high efficiency, and good quality. The two-spotted spider mite is a common pest in the growth of strawberries. It can harm leaves, flowers and fruits, not only affecting the appearance of strawberries, but also causing serious yield reduction. The two-spotted spider mite (Tetranychus urticae Koch), also known as the white spider, belongs to the Tetranychidae family of the order Acarina. It is a major agricultural pest in the world. It has the characteristics of miscellaneous feeding habits, wide host range, strong concealment, and fast reproduction.

[0003] The prevention and control of two-spotted spider mites is difficult due to their small size, large reproduction coefficient, large-scale strawberry planting, seedling transportation, runner reproduction and easy development of drug resistance.

[0004] At present, two-spotted spider mites have developed resistance to almost all miticides on the market. Therefore, how to effectively control the damage of two-spotted spider mites and study and find new miticides has become an effective way.

[0005] At present, the main control measure for strawberry two-spotted spider mites is to spray chemical pesticides. However, due to the long-term use of chemical pesticides, two-spotted spider mites have developed different degrees of resistance to various miticides, resulting in reduced control effects. At the same time, excessive use of chemical pesticides has led to many problems such as environmental pollution, pesticide residues and increased costs.

[0006] At present, most strawberries are eaten fresh, and fruit safety has become the focus of people's attention. Therefore, finding safe, effective and easy-to-use pesticides for controlling two-spotted spider mites is an important issue in the field of pesticide technology. The various beneficial activities contained in biological pesticides can not only effectively control strawberry two-spotted spider mites, but also increase the stress resistance of strawberries and improve fruit yield and quality. Summary of the invention

[0007] The object of the present invention is to provide a drug-fertilizer composition for controlling spider mites and its application in view of the above problems.

[0008] In order to achieve its purpose, the present invention adopts the following technical solution:

[0009] The first aspect of the present invention provides a drug-fertilizer composition for controlling spider mites, comprising carvacrol, chitosan and a nano-isolation slow-release film preparation;

[0010] The nano-isolation sustained-release film preparation comprises the following components in parts by weight: 5 to 10 parts of a modified film-forming agent, 1 to 5 parts of an active microemulsion, 5 to 10 parts of a filler, and 5 to 10 parts of water;

[0011] The active microemulsion comprises the following components: by weight, 10 to 30 parts of emulsifier, 10 to 20 parts of 5-10 wt % alkaline solution, 5 to 10 parts of thymol, and 2 to 5 parts of nanofluid iodine;

[0012] The modified film-forming agent comprises, by weight, 10 to 20 parts of polyvinyl acetate emulsion or vinyl acetate emulsion, 5 to 10 parts of 1 to 2.5 wt% chitosan acetate solution, and 1 to 5 parts of 9 to 11 wt% ammonium persulfate solution; the solid content of the polyvinyl acetate emulsion is 18-45%, and the solid content of the vinyl acetate emulsion is 40-60%.

[0013] Preferably,

[0014] The nano-state isolation sustained-release membrane preparation comprises the following components by weight: 5-6 parts of modified film-forming agent, 1-2 parts of active microemulsion, 5-6 parts of filler, and 5-6 parts of water; the active microemulsion comprises the following components by weight: 10-12 parts of emulsifier, 10-12 parts of 5-10wt% alkaline solution, 5-6 parts of thymol, and 2-3 parts of nanofluid iodine; the modified film-forming agent comprises, by weight, 10-12 parts of polyvinyl acetate emulsion or acetic acid propylene emulsion, 5-6 parts of 1-2.5wt% chitosan acetic acid solution, and 1-2 parts of 9-11wt% ammonium persulfate solution;

[0015] The emulsifier is OP-10 emulsifier;

[0016] The alkaline solution is a KOH solution or a NaOH solution;

[0017] The filler is selected from nano calcium carbonate, calcium sulfate, superphosphate, and lime powder;

[0018] The solid content of polyvinyl acetate emulsion is 20-40% or 25-35%;

[0019] The solid content of the acetic acid acrylic emulsion is 45-60% or 50-58%;

[0020] Further preferably, the nano-isolation sustained-release membrane preparation comprises the following components in parts by weight: 5 parts of modified film-forming agent, 1 part of active microemulsion, 5 parts of filler, and 5 parts of water; the active microemulsion comprises the following components: in parts by weight, 10 parts of emulsifier, 10 parts of 5-10wt% alkaline solution, 5 parts of thymol, and 2 parts of nanofluid iodine; the modified film-forming agent comprises, in parts by weight, 10 parts of polyvinyl acetate emulsion, 5 parts of 1-2.5wt% chitosan acetic acid solution, and 1 part of 9-11wt% ammonium persulfate solution.

[0021] Preferably, the medicinal fertilizer composition is a mixture of 5% carvacrol aqueous solvent, 0.5% chitosan aqueous solvent and 20% nano-isolation sustained-release membrane preparation aqueous solvent in a mass ratio of 0.5-1.5:1.5-3:10-20.

[0022] Preferably, the medicinal fertilizer composition is a mixture of 5% carvacrol aqueous solvent, 0.5% chitosan aqueous solvent and 20% nano-isolation sustained-release membrane preparation aqueous solvent in a mass ratio of 1:2:15.

[0023] Preferably, the drug-fertilizer composition is prepared by mixing the following raw materials in equal volumes:

[0024] 5% carvacrol diluted 1500 times in water,

[0025] 0.5% chitosan diluted 750 times in water,

[0026] 100-fold water dilution of 20% nano-isolation sustained-release membrane preparation.

[0027] The preparation method of the nano-state isolation sustained-release membrane preparation comprises the following steps:

[0028] Step 1: preparing a modified film-forming agent: adding 10 to 20 parts of polyvinyl acetate emulsion or vinyl acetate emulsion and 5 to 10 parts of 1 to 2.5 wt% chitosan acetate solution into a stirred reactor and heating to 60 to 90° C., emulsifying and reacting for 30 min to 1 h at a stirring speed of 150 to 300 r / min, then dripping 1 to 5 parts of 9 to 11 wt% ammonium persulfate solution, and after the dripping is complete, heat-keeping and reacting for 40 min to 90 min to obtain the film-forming agent, preferably heat-keeping and reacting for 60 min to 90 min;

[0029] Step 2: preparing an active microemulsion: taking 10 to 30 parts of an emulsifier and mixing them with 10 to 20 parts of a 5 to 10 wt % alkaline solution, then adding 5 to 10 parts of thymol, stirring at a speed of 150 to 400 r / min to fully dissolve, and then adding 2 to 5 parts of nanofluid iodine and stirring to fully dissolve to obtain an active microemulsion;

[0030] Step 3: Mix 5 to 10 parts of the modified film-forming agent with 5 to 10 parts of water, stir and dissolve them thoroughly to form a membrane matrix solution; mix 10 to 20 parts of the membrane matrix solution with 1 to 5 parts of the active microemulsion and stir evenly, add 5 to 10 parts of filler, stir and mix evenly to obtain the nano-isolation sustained-release membrane; or,

[0031] Step 3 is: take 5-10 parts of modified film-forming agent, 5-10 parts of water and 1-5 parts of active microemulsion, mix them and stir them evenly, add 5-10 parts of filler, stir and mix them evenly, and then the nano-isolation sustained-release film is obtained.

[0032] The second aspect of the present invention provides use of any of the above-mentioned pesticide-fertilizer compositions for controlling spider mites in controlling spider mites.

[0033] The spider mites include two-spotted spider mites, truncate spider mites, cinnabarinus spider mites, and hawthorn spider mites.

[0034] The application is to spray the drug-fertilizer composition on plants.

[0035] Preferably, the application is to dilute the above-mentioned fertilizer-drug composition with water by 1000 to 2000 times and then use it for spraying plants, preferably 1500 times.

[0036] The beneficial effects of the present invention are:

[0037] Carvacrol is a plant-based pesticide extracted from yellow chrysanthemum buds. It has strong insecticidal and bactericidal activity and a wider range of immune biological activity. It can quickly increase the permeability and osmotic pressure of bacterial cell membranes, causing leakage of intracellular substances. The phenolic substances that enter the cells can change the bacterial enzyme system and lead to the death of microorganisms.

[0038] Chitosan is a bio-source pesticide that combines plant-induced disease resistance, plant growth stimulation and the most complete nutritional component of plants. It is a highly effective plant-induced disease and insect pest resistance and a powerful repairer of plant damage. It can induce plants to develop resistance to viruses and a variety of pathogenic fungi, and has an inhibitory effect on spore germination and mycelium caused by plant pathogens. It also has the effects of improving plant cold resistance, promoting growth, and forming a water-retaining film.

[0039] Nano-isolation sustained-release membrane preparations use cross-linked biomacromolecule colloids as carriers to disperse nanoparticles with physical barrier functions. It is a new type of membrane material with physical isolation as its main function. It has the functions of supplementing calcium for plants, preventing diseases and pests, and increasing production and quality.

[0040] The medicinal fertilizer composition of the present invention adopts carvacrol, chitosan and nano-isolation slow-release film preparation for combined use, which has a significant synergistic effect on the prevention and control of spider mites. The effect is significantly better than the use of carvacrol or the commonly used pesticides azadirachtin and matrine for spider mites alone. It has no toxic effect on plants and can promote the growth and increase the yield of fertilizers. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is a transmission electron microscope scanning image of the nano-isolation sustained-release membrane preparation (diluted 200 times) of Example 1. DETAILED DESCRIPTION

[0042] The present invention will be further described below in conjunction with embodiments, but the present invention is not limited thereto.

[0043] The experimental methods in the following examples are conventional methods unless otherwise specified.

[0044] Main raw materials and sources:

[0045] Carvacrol: commercially available 5% (wt%) carvacrol aqueous solution, CAS No. 499-75-2;

[0046] Chitosan: commercially available 0.5% (wt%) chitosan aqueous solution, CAS No. 9012-76-4;

[0047] Azadirachtin: commercially available 0.3% (wt%) azadirachtin emulsifiable concentrate, CAS No. 11141-17-6;

[0048] Matrine: 0.5% (wt%) matrine emulsifiable concentrate, CAS No. 519-02-8;

[0049] Elemental iodine: English name iodine, molecular formula I 2 , CAS No. 7553-56-2.

[0050] Dimethyl sulfoxide (DMSO): CAS number 67-68-5.

[0051] OP-10 emulsifier (alkylphenol polyoxyethylene ether): CAS No. 9002-93-1. The content of OP-10 emulsifier used in the embodiment of the present invention is 99%.

[0052] Thymol: 5-methyl-2-isopropylphenol (English name 5-methyl-2-Isopropylphenol), CAS number: 89-83-8.

[0053] Polyvinyl acetate emulsion: Polyvinyl acetate emulsion, CAS NO: 9003-20-7, a water-soluble adhesive, is a thermoplastic adhesive prepared by polymerization of vinyl acetate monomer under the action of an initiator; usually called white latex or PVAC emulsion for short. The solid content of the polyvinyl acetate emulsion in the present invention is 30±1%.

[0054] Chitosan acetate solution: Chitosan acetate (CAS No.: 70694-72-3) was dissolved in water to prepare a solution.

[0055] Vinyl acetate-propylene emulsion: also known as ethylene-propylene emulsion, is an aqueous polymer resin copolymerized with vinyl acetate and butyl acrylate as main functional monomers; the vinyl acetate-propylene emulsion used in the embodiment of the present invention has a solid content of 55±1wt%.

[0056] Example 1 Preparation of Nano-state Isolation Sustained-release Membrane Preparation

[0057] Follow these steps:

[0058] S1. Preparation of membrane matrix solution

[0059] S1.1. Preparation of modified film-forming agent: add 10 parts of polyvinyl acetate emulsion and 5 parts of 2 wt% chitosan acetate solution into a stirred reactor and heat to 60-90°C, emulsify and react for 30 minutes at a stirring speed of 150-300 r / min, then dropwise add 1 part of 10 wt% ammonium persulfate aqueous solution, and after the dropwise addition is completed, keep the temperature for reaction for 60 minutes to obtain the modified film-forming agent.

[0060] S1.2, preparing membrane matrix solution: taking the modified film-forming agent and mixing it with an equal amount of water, stirring it thoroughly to dissolve it, and forming a membrane matrix solution. This step can also be omitted, and directly using the modified film-forming agent and an equal amount of water to mix with the active microemulsion and filler in step S3.

[0061] S2. Preparation of active microemulsion

[0062] S2.1. Preparation of nanofluid iodine:

[0063] The nanofluid iodine used in the present invention is the atomic fluid iodine or atomic nano iodine disclosed in Chinese Patent ZL 201710388396.5 (Patent Name: Atomic fluid iodine and nano iodine derived therefrom, preparation method and use), and can be prepared by the method disclosed in ZL 201710388396.5.

[0064] In an embodiment of the present invention, the preparation method is specifically as follows: elemental iodine and solvent dimethyl sulfoxide are mixed in a mass ratio of 1:1, stirred and reacted at a temperature of 120°C for 10 minutes, the product is cooled and then statically separated into layers, and the obtained lower layer liquid is nanofluid iodine, wherein the atomic iodine content is 80-93wt%, which is stable to light and heat, and does not sublimate or degrade.

[0065] S2.2, preparing active microemulsion: taking 10 parts of OP-10 emulsifier and mixing with 10 parts of 10 wt% KOH solution, then adding 5 parts of thymol, stirring at a speed of 300 r / min to fully dissolve, then adding 2 parts of nanofluid iodine and stirring to fully dissolve, to obtain active microemulsion;

[0066] S3, prepare nano-state isolation slow-release membrane preparation: take 10 parts of membrane matrix solution (5 parts of modified film-forming agent and 5 parts of water) and mix with 1 part of active microemulsion and stir evenly, add 5 parts of filler, stir and mix well to obtain the nano-state isolation slow-release membrane preparation used in the present invention, which is in the form of emulsion and is ready for use. The filler is nano calcium carbonate.

[0067] The raw material parts in the above steps refer to the weight parts.

[0068] Figure 1 This is a transmission electron microscope scan of the film preparation of Example 1 after dilution 200 times. Nearly circular micelle particles can be observed, and there is a layer of transparent structure outside the particles, indicating that the micelle particles should be a core-shell structure. The hydrophobic thymol and fluid nano-iodine are wrapped in the inner core of the micelle particles. In this way, the effect of sustained drug release can be achieved.

[0069] Example 2 Preparation of the medicinal fertilizer composition

[0070] Prepare carvacrol dilution: dilute 5% carvacrol with water to 1500 times;

[0071] Prepare chitosan dilution: dilute 0.5% chitosan solution to 750 times;

[0072] Prepare the nano-state isolation sustained-release membrane preparation diluent: Take the nano-state isolation sustained-release membrane preparation prepared in Example 1, use water to prepare a nano-state isolation sustained-release membrane preparation with a mass percentage concentration of 20%, and then dilute it with water to 100 times for standby use:

[0073] The prepared carvacrol dilution, chitosan dilution and nano-state isolation slow-release membrane preparation dilution are mixed in equal volumes to obtain the medicinal fertilizer composition of the present invention (wherein the mass ratio of 5% carvacrol aqueous solution, 0.5% chitosan aqueous solution and 20% nano-state isolation slow-release membrane preparation aqueous solution is 1:2:15).

[0074] Example 3 Preparation of the medicinal fertilizer composition

[0075] Take 5% carvacrol aqueous solution, 0.5% chitosan aqueous solution, and 20% nano-state isolation sustained-release membrane preparation (the nano-state isolation sustained-release membrane preparation prepared in Example 1 is prepared with water into a solution with a mass percentage concentration of 20%) and mix them in a mass ratio of 1:2:15 to obtain a mixed solution, and the mixed solution is then diluted 1500 times with water to obtain the drug-fertilizer composition of the present invention, which is directly used for spraying plants to control spider mites.

[0076] Example 4 Application of the drug-fertilizer composition of the present invention in controlling two-spotted spider mites

[0077] 1. Experimental treatment

[0078] The experiment was conducted in the strawberry greenhouse of Beijing Changping National Agricultural Science and Technology Park. The selected test area was for elevated substrate cultivation of strawberries, with consistent cultivation and fertilizer and water management levels. When the pesticide was applied for the first time, the damage caused by two-spotted spider mites was relatively light, and it was in the best period for prevention and control.

[0079] The experiment has 5 treatments:

[0080] Treatment 1. The fertilizer composition prepared in Example 2;

[0081] Treatment 2. Carvacrol dilution: 5% carvacrol solution was diluted 1500 times with water;

[0082] Treatment 3. 0.3% azadirachtin emulsifiable concentrate was diluted with water to 1000 times;

[0083] Treatment 4. Dilute 0.5% matrine emulsifiable concentrate with water to 1000 times;

[0084] Treatment 5. Clean water.

[0085] Each treatment was repeated 3 times, with a plot size of 60 m 2 , random block arrangement, with protection rows between each block, slight occurrence of strawberry two-spotted spider mite, use a backpack electric sprayer to evenly spray both sides of the leaves according to the conventional spraying method, until there is a small amount of water dripping from the leaves.

[0086] 2. Experimental investigation:

[0087] The number of live spider mites was investigated before and 1d, 3d, and 7d after application. The diagonal five-point sampling method was used to investigate 5 compound leaves at each point (front and back investigations) and record the number of two-spotted spider mites on strawberries. The number of live insects on each fixed point leaf was recorded before and after application, and the control effect was calculated and analyzed based on the survey data. The growth status of strawberries in each plot was observed 1d, 3d, and 7d after application to visually check whether there was any pesticide damage.

[0088] The formula for calculating the control effect is:

[0089]

[0090] Efficacy results: The results are shown in Table 4.

[0091] Table 4. The efficacy of 4 kinds of pesticides on two-spotted spider mites

[0092]

[0093] Note: * in Table 4 indicates no phytotoxicity was found.

[0094] From the results, it can be seen that the composition of treatment 1 "5% carvacrol aqueous solution + 0.5% chitosan aqueous solution + 20% nano-state isolation sustained-release membrane preparation" has a good control effect on two-spotted spider mites, and the control effect on two-spotted spider mites reaches 100% after application.

[0095] Visual observations at 1, 3, and 7 days after application showed that the strawberry plants in each treatment grew normally, with no phytotoxicity, leaf curling, deformity, yellowing, or dwarfing. This indicates that the composition of "5% carvacrol aqueous solution + 0.5% chitosan aqueous solution + 20% nano-isolation sustained-release membrane preparation" has no phytotoxicity to strawberry plants.

Claims

1. A drug-fertilizer composition for controlling spider mites, characterized in that: Containing carvacrol, chitosan and nano-isolation sustained-release membrane preparation; The nano-isolation sustained-release film preparation comprises the following components in parts by weight: 5 to 10 parts of a modified film-forming agent, 1 to 5 parts of an active microemulsion, 5 to 10 parts of a filler, and 5 to 10 parts of water; The active microemulsion comprises the following components: by weight, 10 to 30 parts of emulsifier, 10 to 20 parts of 5-10 wt % alkaline solution, 5 to 10 parts of thymol, and 2 to 5 parts of nanofluid iodine; The modified film-forming agent comprises, by weight, 10 to 20 parts of polyvinyl acetate emulsion or vinyl acetate emulsion, 5 to 10 parts of 1 to 2.5 wt% chitosan acetate solution, and 1 to 5 parts of 9 to 11 wt% ammonium persulfate solution; the solid content of the polyvinyl acetate emulsion is 18-45%, and the solid content of the vinyl acetate emulsion is 40-60%.

2. The drug-fertilizer composition according to claim 1, characterized in that: The nano-state isolation sustained-release membrane preparation comprises the following components by weight: 5-6 parts of modified film-forming agent, 1-2 parts of active microemulsion, 5-6 parts of filler, and 5-6 parts of water; the active microemulsion comprises the following components by weight: 10-12 parts of emulsifier, 10-12 parts of 5-10wt% alkaline solution, 5-6 parts of thymol, and 2-3 parts of nanofluid iodine; the modified film-forming agent comprises, by weight, 10-12 parts of polyvinyl acetate emulsion or acetic acid propylene emulsion, 5-6 parts of 1-2.5wt% chitosan acetic acid solution, and 1-2 parts of 9-11wt% ammonium persulfate solution; The emulsifier is OP-10 emulsifier; The alkaline solution is a KOH solution or a NaOH solution; The filler is selected from nano calcium carbonate, calcium sulfate, superphosphate, and lime powder; The solid content of polyvinyl acetate emulsion is 20-40% or 25-35%; The solid content of the acetic acid acrylic emulsion is 45-60% or 50-58%; Preferably, the nano-isolation sustained-release membrane preparation comprises the following components in parts by weight: 5 parts of modified film-forming agent, 1 part of active microemulsion, 5 parts of filler, and 5 parts of water; the active microemulsion comprises the following components in parts by weight: 10 parts of emulsifier, 10 parts of 5-10wt% alkaline solution, 5 parts of thymol, and 2 parts of nanofluid iodine; the modified film-forming agent comprises, in parts by weight, 10 parts of polyvinyl acetate emulsion, 5 parts of 1-2.5wt% chitosan acetic acid solution, and 1 part of 9-11wt% ammonium persulfate solution.

3. The drug-fertilizer composition according to claim 1, characterized in that: The invention is prepared by mixing 5% carvacrol water solvent, 0.5% chitosan water solvent and 20% nano isolation sustained-release membrane preparation water solvent in a mass ratio of 0.5-1.5:1.5-3:10-20.

4. The drug-fertilizer composition according to claim 3, characterized in that: The invention is prepared by mixing 5% carvacrol water solvent, 0.5% chitosan water solvent and 20% nano isolation sustained-release membrane preparation water solvent in a mass ratio of 1:2:

15.

5. The drug-fertilizer composition according to claim 1, characterized in that It is made by mixing the following materials in equal volumes: 5% carvacrol diluted 1500 times in water, 0.5% chitosan diluted 750 times in water, 100-fold water dilution of 20% nano-isolation sustained-release membrane preparation.

6. The drug-fertilizer composition according to claim 1, characterized in that: The preparation method of the nano-isolation sustained-release membrane preparation comprises the following steps: Step 1: preparing a modified film-forming agent: adding 10 to 20 parts of polyvinyl acetate emulsion or vinyl acetate emulsion and 5 to 10 parts of 1 to 2.5 wt% chitosan acetate solution into a stirred reactor and heating to 60 to 90° C., emulsifying and reacting for 30 min to 1 h at a stirring speed of 150 to 300 r / min, then dripping 1 to 5 parts of 9 to 11 wt% ammonium persulfate solution, and after the dripping is complete, heat-keeping and reacting for 40 min to 90 min to obtain the film-forming agent, preferably heat-keeping and reacting for 60 min to 90 min; Step 2: preparing an active microemulsion: taking 10 to 30 parts of an emulsifier and mixing them with 10 to 20 parts of a 5 to 10 wt % alkaline solution, then adding 5 to 10 parts of thymol, stirring at a speed of 150 to 400 r / min to fully dissolve, and then adding 2 to 5 parts of nanofluid iodine and stirring to fully dissolve to obtain an active microemulsion; Step 3: Mix 5 to 10 parts of the modified film-forming agent with 5 to 10 parts of water, stir and dissolve them thoroughly to form a membrane matrix solution; mix 10 to 20 parts of the membrane matrix solution with 1 to 5 parts of the active microemulsion and stir evenly, add 5 to 10 parts of filler, stir and mix evenly to obtain the nano-isolation sustained-release membrane; or, Step 3 is: take 5-10 parts of modified film-forming agent, 5-10 parts of water and 1-5 parts of active microemulsion, mix them and stir them evenly, add 5-10 parts of filler, stir and mix them evenly, and then the nano-isolation sustained-release film is obtained.

7. Use of the drug-fertilizer composition for controlling spider mites according to any one of claims 1 to 6 in controlling spider mites.

8. The use according to claim 7, characterized in that: The spider mites include two-spotted spider mites, truncate spider mites, cinnabarinus spider mites, and hawthorn spider mites.

9. The use according to claim 7, characterized in that: The drug-fertilizer composition according to claim 5 is sprayed on the plants.

10. The use according to claim 7, characterized in that: The drug-fertilizer composition according to claims 3 to 4 is diluted 1000 to 2000 times with water and then used for spraying plants, preferably 1500 times.

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