A compound mosquito larvae killing composition containing fenthion and its application

Abstract

The invention discloses a compound mosquito larvae killing composition containing fenthion and its application. The active ingredients are composed of fenthion and dinotefuran or thiamethoxam. The weight ratio of fenthion to dinotefuran is 1:8-8:1, and the weight ratio of fenthion to thiamethoxam is 1:10-10:1. The dosage form of the compound mosquito larvae killing composition containing fenthion is a granule, which is composed of 1%-5% of the active ingredient, 1%-5% of the liquid original drug adsorbent, 2%-9% of the slow-release coating agent (containing 1%-5% of the dispersant, 0.5%-2% of the wetting agent, 0.5%-2% of the binder) and the balance carrier according to the percentage of the total weight of the granule. The insecticide of the invention is processed into granules by compounding fenthion and dinotefuran or thiamethoxam, and is used for mosquito larvae control, has good lethal effect, long lasting effect, has a slow-release effect, and reduces labor costs; can be widely used in sewage ditches, sewers and other places, and has a special effect on the control of mosquito larvae.

Description

Technical Field

[0001] The invention relates to a sanitary insecticide, in particular to a compound mosquito larvae killing composition containing fenthion and application thereof. Background Art

[0002] Mosquitoes are the most familiar and important health pests. Mosquito control generally adopts environmental management, biological control and chemical control. Chemical control is currently the most commonly used control method. Among them, outdoor space spraying, which is commonly used to kill adult mosquitoes, can quickly reduce the density of mosquitoes. Killing larvae is also an important auxiliary measure to control mosquitoes. Outdoor stagnant water places such as abandoned tires, concrete floors, fire barrels, sewage ditches, septic tanks, rainwater wells, etc. are very easy to breed mosquito larvae. If the stagnant water cannot be removed or cannot be cleared for a while, chemical means can be used to kill the larvae.

[0003] Currently, mosquito larvae control mainly includes two categories. One is hormone products, which kill mosquitoes by inhibiting the normal molting or emergence of mosquito larvae. The other is to directly kill the larvae through contact or stomach poisoning, thereby achieving the purpose of control.

[0004] At present, the registered drugs for mosquito larvae control in my country are still mainly single agents, and the specific active ingredients involved include pyriproxyfen, dimethoate, fenthion, methyl pyrifos, ethomethrin, etc., and the number of compound registrations is relatively small. The long-term use of a single agent to control mosquito larvae will inevitably make the mosquito larvae develop a certain resistance to some agents, which will greatly reduce the control effect of the agent.

[0005] Fenthion is an organophosphorus insecticide and a cholinesterase inhibitor. It has contact, stomach poison and fumigation effects. It has a certain degree of permeability to crops, but no systemic conduction effect. It has a wide insecticide spectrum and acts quickly. It is mainly used to control various pests on crops such as rice borers, soybean borers, fruit trees and vegetables. It can also control pests of cotton and cereal crops, and has good effects on mosquitoes, flies and bedbugs. However, the dosage of fenthion used in pest control is relatively large, which will bring great pressure on environmental protection.

[0006] Dinotefuran is a new generation of super nicotinic insecticide, an acetylcholine receptor blocker that affects the synapses of the insect central nervous system. It has the characteristics of contact killing, stomach poison, systemicity, high rapid effect, and a wide insecticidal spectrum. There are no related reports on the control of dinotefuran on mosquito larvae. Thiamethoxam is a nicotinic acetylcholine receptor stimulant that affects the synapses of the insect central nervous system. It has good contact killing and stomach poison activity and strong systemic conductivity. Pests inhale the agent, quickly inhibit their activities, stop feeding, and gradually die. It has the characteristics of high efficiency, long lasting effect, and low dosage per unit area. Its lasting effect can reach about one month. There are no related reports on the combination of thiamethoxam and organophosphorus insecticides in the control of mosquito larvae.

[0007] At present, granules are still the main method for controlling mosquito larvae. Granules are mainly prepared by carrier coating and carrier adsorption. The coating method is to coat solid technical drugs on carriers to make granules. Liquid technical drugs cannot be directly coated. The adsorption method mainly uses porous carriers to adsorb liquid technical drugs. Solid technical drugs cannot be directly adsorbed, and the technical drugs are simply adsorbed on the carrier. After application, the drug is released quickly and has poor lasting effect. The preparation of granules with solid and liquid technical drugs requires consideration of the preparation method of granules, as well as the lasting effect of granules. Summary of the invention

[0008] The technical problem to be solved by the present invention is to provide a compound mosquito larvae killing composition containing fenthion and its application in view of the deficiencies in the prior art. Fenthion has different action mechanisms from dinotefuran and thiamethoxam. The present invention combines fenthion with dinotefuran or thiamethoxam to prevent and control sanitary pests, mosquito larvae, and has a synergistic effect, which can effectively alleviate the problem of drug resistance that may be generated by the long-term use of a single agent by mosquito larvae. It can not only reduce the usage of fenthion and reduce environmental pollution, but also improve the control effect, have a long lasting effect, and have a sustained release effect. The insecticidal composition of the present invention has a good insecticidal effect, a dual mechanism compound with synergistic effect, a sustained release effect, and is not easy to produce drug resistance.

[0009] In order to achieve the above object, the present invention adopts the following technical solution:

[0010] The invention firstly provides a compound mosquito larva killing composition containing fenthion, which is compounded by fenthion and dinotefuran or thiamethoxam, wherein the weight ratio of fenthion to dinotefuran is 1:8-8:1, and the weight ratio of fenthion to thiamethoxam is 1:10-10:1.

[0011] In the above technical solution, the weight ratio of fenthion to dinotefuran is preferably 1:2 to 6:1.

[0012] In the above technical solution, the weight ratio of fenthion to thiamethoxam is preferably 1:4 to 8:1.

[0013] The present invention also provides a compound mosquito larvae killing granule containing fenthion, which is a granule prepared from the compound mosquito larvae killing composition containing fenthion, a liquid original drug adsorbent, a slow-release coating agent, and a carrier as raw materials, and the percentage of each component in the total weight of the granule is: 1% to 5% of the compound mosquito larvae killing composition containing fenthion, 1% to 5% of the liquid original drug adsorbent, 2% to 9% of the slow-release coating agent, and the carrier is supplemented to 100%.

[0014] In the above technical solution, the 2% to 9% sustained-release coating agent includes 1% to 5% of a dispersant, 0.5% to 2% of a wetting agent, and 0.5% to 2% of a binder.

[0015] In the above technical solution, the dispersant is selected from any one of sodium alkylbenzene sulfonate, sodium naphthalene sulfonate formaldehyde condensate, sodium methylene bis naphthalene sulfonate, sodium lignin sulfonate and sodium polyacrylate.

[0016] In the above technical solution, the wetting agent is selected from any one of sodium butylnaphthalene sulfonate, sodium dodecyl sulfate, sodium fatty acid ester sulfate, octylphenol polyoxyethylene ether-40, and sodium dihydroxybiphenyl sulfonate.

[0017] In the above technical solution, the binder is selected from any one of polyvinyl acetate, polyvinyl alcohol, sodium carboxymethyl cellulose, gum arabic, and sodium silicate.

[0018] In the above technical solution, the liquid technical adsorbent is selected from any one of white carbon black, diatomaceous earth, attapulgite and bentonite.

[0019] In the above technical solution, the carrier is selected from any one of silica sand, quartz sand, marble and granular calcium carbonate.

[0020] The present invention also provides a method for preparing the compound mosquito larvae killing granules containing fenthion, which uses an adsorbent to adsorb the liquid original drug, and coats the active ingredient on the surface of the carrier through a slow-release coating agent, thereby solving the problem that the liquid original drug cannot be coated, and having a slow-release effect. The method comprises the following steps:

[0021] (1) Mixing the dispersant, wetting agent and binder in the above weight percentages with an appropriate amount of water to prepare a sustained-release coating agent (since the water will be dried off later, there is no need to specifically limit the amount used, as long as the dispersant, wetting agent and binder can be fully dissolved);

[0022] (2) mixing the weight percentage of fenthion with a liquid technical adsorbent to form a powder, and mixing the powder with the weight percentage of dinotefuran or thiamethoxam and mixing the mixture by air flow grinding to form a composite mosquito larvae killing composition powder;

[0023] (3) mixing the carrier and the sustained-release coating agent in the above weight percentages, stirring and coating, so that the sustained-release coating agent is evenly coated on the surface of the carrier; then adding the powder of the composite mosquito larvae killing composition into the carrier coated with the sustained-release coating agent, stirring and coating evenly; and finally drying the coated particles.

[0024] The present invention also provides an application of the compound mosquito larvae-killing granules containing fenthion in killing sanitary pests in mosquito larvae breeding areas.

[0025] In the above technical solution, the sanitary pests are mosquito larvae.

[0026] In the above technical solution, the mosquito larvae breeding grounds are sewage ditches, sewers and other places.

[0027] The technical solution of the present invention has the advantages that: the insecticide of the present invention is processed into granules by compounding fenthion and dinotefuran or thiamethoxam, and is used for mosquito larvae control; the compound mosquito larvae killing composition of the present invention has good insecticidal effect, the dual mechanism compounding has synergistic effect, has a sustained release effect and is not easy to produce drug resistance; the compound mosquito larvae killing composition of the present invention has good lethal effect, a long lasting effect, has a sustained release effect, and reduces labor costs; it can be widely used in sewage ditches, sewers and other places, and has a special effect on the prevention and control of mosquito larvae. DETAILED DESCRIPTION

[0028] The specific implementation of the technical solution of the present invention is described in detail below, but the present invention is not limited to the following description:

[0029] Unless otherwise specified, the percentages in the following examples are by weight.

[0030] The present invention will be described below in conjunction with specific embodiments:

[0031] Formulation Example 1: 1.8% fenthion·dinotefuran granules

[0032] Fenthion 0.2%, dinotefuran 1.6%, sodium methylenebisnaphthalene sulfonate 3%, sodium sulfate of fatty acid ester 2%, white carbon black 1%, sodium carboxymethyl cellulose 2%, marble to 100%.

[0033] Formulation Example 2: 2.8% fenthion·dinotefuran granules

[0034] Fenthion 0.4%, dinotefuran 2.4%, sodium alkylbenzene sulfonate 4%, sodium butylnaphthalene sulfonate 2%, diatomaceous earth 1.5%, polyvinyl alcohol 1.5%, and quartz sand to 100%.

[0035] Formulation Example 3: 1% fenthion·dinotefuran granules

[0036] Fenthion 0.2%, dinotefuran 0.8%, sodium methylenebisnaphthalene sulfonate 1%, sodium fatty acid ester sulfate 0.5%, bentonite 1%, sodium carboxymethyl cellulose 0.5%, and silica sand to 100%.

[0037] Formulation Example 4: 3% fenthion·dinotefuran granules

[0038] Fenthion 1%, dinotefuran 2%, sodium lignin sulfonate 2.5%, octylphenol polyoxyethylene ether-40 1.5%, diatomaceous earth 3%, gum arabic 1.5%, granular calcium carbonate supplemented to 100%.

[0039] Formulation Example 5: 1% fenthion·dinotefuran granules

[0040] 0.5% of fenthion, 0.5% of dinotefuran, 4% of sodium polyacrylate, 1% of sodium dihydroxybiphenyl sulfonate, 1% of attapulgite, 0.5% of sodium silicate, and quartz sand are added to make up to 100%.

[0041] Formulation Example 6: 4.5% fenthion·dinotefuran granules

[0042] Fenthion 3%, dinotefuran 1.5%, sodium naphthalenesulfonate formaldehyde condensate 2.5%, octylphenol polyoxyethylene ether-40 1.5%, bentonite 4%, polyvinyl alcohol 1%, granular calcium carbonate supplemented to 100%.

[0043] Formulation Example 7: 3% fenthion·dinotefuran granules

[0044] Fenthion 2.5%, dinotefuran 0.5%, sodium lignin sulfonate 2.5%, sodium lauryl sulfate 2%, white carbon black 3.5%, polyvinyl acetate 1%, marble supplemented to 100%.

[0045] Formulation Example 8: 5% fenthion·dinotefuran granules

[0046] Fenthion 4%, dinotefuran 1%, sodium polyacrylate 5%, sodium sulfate of fatty acid ester 2%, diatomaceous earth 5%, sodium carboxymethyl cellulose 2%, and silica sand to 100%.

[0047] Formulation Example 9: 2.1% fenthion·dinotefuran granules

[0048] 1.8% of fenthion, 0.3% of dinotefuran, 1.5% of sodium alkylbenzene sulfonate, 0.5% of sodium dodecyl sulfate, 2% of bentonite, 1.5% of gum arabic, and quartz sand to make up to 100%.

[0049] Formulation Example 10: 1.8% fenthion·dinotefuran granules

[0050] 1.6% of fenthion, 0.2% of dinotefuran, 1.5% of sodium polyacrylate, 1% of sodium sulfate of fatty acid ester, 2.5% of attapulgite, 2% of sodium silicate, and granular calcium carbonate are supplemented to 100%.

[0051] Formulation Example 11: 1.1% Fenthion·Thiamethoxam Granules

[0052] Fenthion 0.1%, thiamethoxam 1%, sodium lignin sulfonate 1%, sodium dihydroxybiphenyl sulfonate 0.5%, diatomaceous earth 1%, polyvinyl alcohol 0.5%, marble supplemented to 100%.

[0053] Formulation Example 12: 2.7% Fenthion·Thiamethoxam Granules

[0054] Fenthion 0.3%, thiamethoxam 2.4%, sodium methylene bisnaphthalene sulfonate 3.5%, octylphenol polyoxyethylene ether-40 1.5%, white carbon black 1.5%, gum arabic 1.2%, and quartz sand to 100%.

[0055] Formulation Example 13: 1.4% Fenthion·Thiamethoxam Granules

[0056] Fenthion 0.2%, thiamethoxam 1.2%, sodium naphthalenesulfonate formaldehyde condensate 2.5%, sodium butylnaphthalenesulfonate 1%, attapulgite 2%, gum arabic 0.8%, marble to 100%.

[0057] Formulation Example 14: 5% Fenthion·Thiamethoxam Granules

[0058] Fenthion 1%, thiamethoxam 4%, sodium polyacrylate 4.5%, sodium lauryl sulfate 1.5%, bentonite 3%, sodium silicate 1%, granular calcium carbonate supplemented to 100%.

[0059] Formulation Example 15: 4% Fenthion·Thiamethoxam Granules

[0060] Fenthion 2%, thiamethoxam 2%, sodium alkylbenzene sulfonate 4%, sodium dihydroxybiphenyl sulfonate 2%, attapulgite 4%, sodium silicate 2%, and silica sand to 100%.

[0061] Formulation Example 16: 4% Fenthion·Thiamethoxam Granules

[0062] Fenthion 4%, thiamethoxam 1%, sodium naphthalenesulfonate formaldehyde condensate 4.5%, fatty acid ester sodium sulfate 1.5%, diatomaceous earth 4.5%, polyvinyl acetate 0.6%, marble to 100%.

[0063] Formulation Example 17: 2.8% Fenthion·Thiamethoxam Granules

[0064] Fenthion 2.4%, thiamethoxam 0.4%, sodium polyacrylate 3.5%, sodium lauryl sulfate 0.8%, diatomaceous earth 2.5%, gum arabic 1.2%, and silica sand to 100%.

[0065] Formulation Example 18: 1.8% Fenthion·Thiamethoxam Granules

[0066] 1.6% of fenthion, 0.2% of thiamethoxam, 3% of sodium naphthalenesulfonate formaldehyde condensate, 1.5% of sodium butylnaphthalenesulfonate, 2.5% of attapulgite, 1.2% of polyvinyl acetate, and granular calcium carbonate to make up to 100%.

[0067] Formulation Example 19: 5% Fenthion·Thiamethoxam Granules

[0068] Fenthion 4.5%, thiamethoxam 0.5%, sodium lignin sulfonate 4%, sodium fatty acid ester sulfate 2%, attapulgite 5%, sodium carboxymethyl cellulose 2%, and quartz sand to 100%.

[0069] Formulation Example 20: 2.2% Fenthion·Thiamethoxam Granules

[0070] Fenthion 2%, thiamethoxam 0.2%, sodium polyacrylate 2.5%, sodium dihydroxybiphenyl sulfonate 0.5%, white carbon black 2.5%, sodium carboxymethyl cellulose 1.2%, and silica sand to 100%.

[0071] Application Example 1: Efficacy test for controlling mosquito larvae

[0072] Test target: Late third and early fourth instar larvae of Culex pipiens pallens

[0073] Test method: Add 5L of dechlorinated water to a plastic bucket, weigh the granules and put them into the water to make the active ingredient concentration 1mg / L. After one day, measure 200mL of the water with medicine into a 250mL beaker and put 30 Culex pipiens pallens larvae. The test insects are raised under the experimental conditions of (25±1)℃ and relative humidity (60±10)%, and repeated three times. The number of deaths is counted after 7 days. The larvae are considered dead if they do not move or just tremble when gently touched with the tip of tweezers. Larvae that have already pupated but do not move or just tremble when gently touched with the tip of tweezers are also considered dead.

[0074] Test treatment: Formulation examples 1, 3, 5, 6, 11, 13, 15, and 16 were used to treat water bodies with a total active ingredient concentration of 1 mg / L;

[0075] Control sample 1: 5% fenthion granules (prepared according to the method of Formulation Example 6 of the present invention) diluted to 1 mg / L;

[0076] Control sample 2: 5% dinotefuran granules (prepared according to the method of Formulation Example 1 of the present invention) diluted to 1 mg / L;

[0077] Control sample 3: 5% thiamethoxam granules (prepared according to the method of Formulation Example 15 of the present invention) diluted to 1 mg / L;

[0078] Blank control: 200 mL dechlorinated water

[0079] The test results show that the lethality of the control samples 1-3 to mosquito larvae is lower than that of the preparation of the present invention, and the lethality of the preparation examples 1, 3, 5, 6, 11, 13, 15, and 16 of the present invention is good. (See Table 1)

[0080] Table 1 Efficacy test of formulation examples 1, 3, 5, 6, 11, 13, 15, 16 for controlling mosquito larvae

[0081]

[0082]

[0083] The remaining preparation examples were further subjected to the same efficacy test, and the lethal effect was good.

[0084] Application Example 2: Sustained-release and sustained-effect test for controlling mosquito larvae

[0085] Test target: Late third and early fourth instar larvae of Culex pipiens pallens

[0086] Test method: Add 5L of dechlorinated water into a plastic bucket, weigh the granules and put them into the water to make the active ingredient concentration 1mg / L. After leaving it for 1 day, measure 200mL of the medicated water into a 250mL beaker; put 30 Culex pipiens larvae into the beaker. The test insects are raised under the experimental conditions of (25±1)℃ and relative humidity (60±10)%. Repeat three times. Count the number of deaths after 7 days. Touch the larvae lightly with the tip of tweezers. If they do not move or just tremble, they are considered dead. Larvae that have already pupated but do not move or just tremble when touched lightly with the tip of tweezers are also considered dead. On the 14th day, pour out the water from the plastic bucket containing the medicine, leaving the granules, add fresh dechlorinated water, let it stand for 1 day, then measure 200mL of the medicine-containing water into a 250mL beaker, and conduct the same efficacy test. Similarly, pour out the water on the 29th day, add fresh dechlorinated water, let it stand for 1 day, then measure 200mL of the medicine-containing water into a 250mL beaker, and conduct the efficacy test.

[0087] Preparation of control sample: The preparation method of the control sample of this test is as follows: a certain amount of solvent is used to dissolve the solid original drug, and a porous carrier (red brick stone particles) is used to adsorb the solution containing the solid original drug and the liquid original drug. After sufficient mixing, stirring and adsorption, the granules are completely prepared.

[0088] Test treatment: Formulation examples 2, 7, 9, 12, 17, and 19 were used to treat water bodies with a total active ingredient concentration of 1 mg / L;

[0089] Control sample 4: granules of the same concentration as in Example 2 (prepared by porous carrier adsorption method) diluted to 1 mg / L;

[0090] Control sample 5: granules of the same concentration as in Example 7 (prepared by porous carrier adsorption method) diluted to 1 mg / L;

[0091] Control sample 6: granules of the same concentration as in Preparation Example 9 (prepared by porous carrier adsorption method) diluted to 1 mg / L;

[0092] Control sample 7: granules of the same concentration as in Example 12 (prepared by porous carrier adsorption method) diluted to 1 mg / L;

[0093] Control sample 8: granules of the same concentration as in Preparation Example 17 (prepared by porous carrier adsorption method) diluted to 1 mg / L;

[0094] Control sample 9: granules of the same concentration as in Preparation Example 19 (prepared by porous carrier adsorption method) diluted to 1 mg / L;

[0095] Test results:

[0096] The test results show that the preparation of the present invention has a good lethality on the 1st day, the 15th day and the 30th day during the effective period, and has a sustained release effect. The lethality on the 15th day and the 30th day is better than that of the control sample 4-9 to mosquito larvae. The control sample 4-9 has a good lethality on the 1st day to mosquito larvae, but due to the use of a simple porous carrier for adsorption, the release rate of the effective ingredient is relatively fast, and the lethality on the 15th day and the 30th day is relatively poor; the preparation examples 2, 7, 9, 12, 17, and 19 of the present invention have good lethality, good persistence, and a sustained release effect (see Table 2)

[0097] Table 2 Sustained release and sustained effect test of formulation examples 2, 7, 9, 12, 17, 19 for controlling mosquito larvae

[0098]

[0099]

[0100] The remaining formulation examples were further subjected to the same efficacy test, and the lethal effect was good and the lasting effect was good.

[0101] Application Example 3: Outdoor efficacy test on breeding ground mosquito larvae

[0102] Test target: mosquito larvae Test method: Sprinkle the agent in the sewage ditch and record the density reduction rate of mosquito larvae in 24 hours; Test treatment: Formulation examples 1, 4, 8, 10, 12, 14, 18, 20, the application rate is 2g / m 2 ;

[0103] Test results:

[0104] The test results show that the preparation of the present invention has a significant effect in killing mosquito larvae, and the density of mosquito larvae is reduced at a high rate (see Table 3). Table 3 Outdoor efficacy test on breeding ground mosquito larvae

[0105]

[0106]

[0107] Application Example 4: Determination of the co-toxicity coefficient of fenthion and dinotefuran or thiamethoxam to mosquito larvae

[0108] Test target: Late third and early fourth instar larvae of Culex pipiens pallens

[0109] Test method: Dilute the agent with acetone to 5 to 7 concentration gradients, draw 1 mL and add it to a beaker containing 149 mL of dechlorinated water, stir evenly, and repeat three times. Then draw 30 Culex pipiens pallens together with 50 mL of dechlorinated water and add them to the above water body, a total of 200 mL of water body for testing. The test insects are raised under the experimental conditions of (25±1)℃ and relative humidity (60±10)%. The number of deaths is counted after 24 hours. The larvae are gently touched with the tip of tweezers. If they do not move or just tremble, they are considered dead. If the larvae have already pupated, but they do not move or just tremble when gently touched with the tip of tweezers, they are also considered dead.

[0110] The data were used to calculate the median lethal concentration (LC50) using the linear weighted regression method, and the co-toxicity coefficient was calculated with reference to Sun Yunpei's method.

[0111] The test results show that, through indoor efficacy tests and calculations, it can be known that the insecticide composition of the present invention has a good synergistic effect on the lethality of mosquito larvae after compounding. The specific results are shown in the following table:

[0112] Table 4 Determination of the co-toxicity coefficient of dimethoate and dinotefuran (targeting Culex pipiens larvae)

[0113]

[0114]

[0115] As shown in Table 4, when the combination ratio of fenthion and dinotefuran is 1:8-8:1, the co-toxicity coefficient against mosquito larvae is greater than 100, especially when the combination ratio is 1:2-6:1, the co-toxicity coefficient exceeds 120, which has a significant synergistic effect.

[0116] Table 5 Determination of the co-toxicity coefficient of fenthion and thiamethoxam (for Culex pipiens larvae)

[0117]

[0118]

[0119] As shown in Table 5, when the ratio of fenthion to thiamethoxam was 1:10 to 10:1, the co-toxicity coefficient against mosquito larvae was greater than 100, especially when the ratio was 1:4 to 8:1, the co-toxicity coefficient exceeded 120, showing a significant synergistic effect.

[0120] The above examples are only for illustrating the technical concept and technical features of the present invention, and cannot be used to limit the protection scope of the present invention. Any equivalent transformation or modification made according to the essence of the present invention should be included in the protection scope of the present invention.

Claims

1. A composite mosquito larvae killing composition containing fenthion, characterized in that: It is compounded by fenthion and dinotefuran or thiamethoxam, the weight ratio of fenthion to dinotefuran is 1:2-6:1, and the weight ratio of fenthion to thiamethoxam is 1:4-8:

1.

2. A compound mosquito larvae-killing granule containing fenthion, which is a granule prepared from the compound mosquito larvae-killing composition containing fenthion according to claim 1 and a liquid original drug adsorbent, a slow-release coating agent, and a carrier as raw materials, characterized in that: The percentage of each component in the total weight of the granules is: 1% to 5% of the compound mosquito larvae killing composition containing fenthion, 1% to 5% of the liquid original drug adsorbent, 2% to 9% of the slow-release coating agent, and the carrier is supplemented to 100%; the 2% to 9% slow-release coating agent includes 1% to 5% of a dispersant, 0.5% to 2% of a wetting agent, and 0.5% to 2% of a binder.

3. The compound mosquito larvae killing granules containing fenthion according to claim 2, characterized in that: The dispersant is selected from any one of sodium alkylbenzene sulfonate, sodium naphthalene sulfonate formaldehyde condensate, sodium methylene bisnaphthalene sulfonate, sodium lignin sulfonate, and sodium polyacrylate; the wetting agent is selected from any one of sodium butyl naphthalene sulfonate, sodium lauryl sulfate, sodium fatty acid ester sulfate, octylphenol polyoxyethylene ether-40, and sodium dihydroxybiphenyl sulfonate; the binder is selected from any one of polyvinyl acetate, polyvinyl alcohol, sodium carboxymethyl cellulose, gum arabic, and sodium silicate.

4. The compound mosquito larvae killing granules containing fenthion according to claim 2, characterized in that: The liquid technical adsorbent is selected from any one of white carbon black, diatomaceous earth, attapulgite and bentonite; the carrier is selected from any one of silica sand, quartz sand, marble and granular calcium carbonate.

5. A method for preparing the compound mosquito larvae killing granules containing fenthion according to claim 2, characterized in that: The following steps are involved: (1) The dispersant, wetting agent and binder in the above weight percentages are mixed with an appropriate amount of water to prepare a sustained-release coating agent. Since the water will be dried off later, there is no need to specifically limit the amount used, as long as the dispersant, wetting agent and binder can be fully dissolved; (2) mixing the weight percentage of fenthion with a liquid technical adsorbent to form a powder, and mixing the powder with the weight percentage of dinotefuran or thiamethoxam and mixing the mixture by air flow grinding to form a composite mosquito larvae killing composition powder; (3) mixing the carrier and the sustained-release coating agent in the above weight percentages, stirring and coating, so that the sustained-release coating agent is evenly coated on the surface of the carrier; then adding the powder of the composite mosquito larvae killing composition into the carrier coated with the sustained-release coating agent, stirring and coating evenly; and finally drying the coated particles.

6. Use of the compound mosquito larvae-killing granules containing fenthion as claimed in claim 2 in killing sanitary pests in mosquito larvae breeding areas, characterized in that: The sanitary pests are mosquito larvae; the breeding grounds of the mosquito larvae are sewage ditches and sewers.

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