A method for removing pests in corn fields

Abstract

The present invention relates to the technical field of farmland pest control. Aiming at the problem of rampant fall armyworms in corn fields, a pest control material for corn fields is disclosed. The pest control material is a multi-layered granular material, and includes multiple levels of active pest control layers and slow-release layers that are alternately arranged layer by layer along the direction from the inner layer to the outer layer. The outer layer of the pest control material is coated with zinc ion fertilizer and / or granular boron; the active pest control layer includes a pest control matrix, which is a pest control agent that can remove corn field pests; and the slow-release layer includes a water-soluble slow-release material. The pest control granular material is made of multiple layers of slow-release materials, so that the pest control material is released layer by layer on the surface of the plant, and the moths are eliminated in the early stage of feeding, so as to achieve long-term pest control and solve the problem of low corn yield caused by pests such as fall armyworms in corn fields.

Description

Technical Field

[0001] The invention relates to the technical field of farmland pest control, and in particular to a method for pest control in corn fields. Background Art

[0002] The fall armyworm (Spodoptera frugiperda) is a moth pest of the Noctuidae family. It is native to tropical America and later invaded my country via Africa and other places. As the fall armyworm has a strong migration ability, it has now spread to most provinces in my country. After the larvae of the fall armyworm feed on leaves, they will cause the leaves to fall off and cut off the stems of seedlings and effective plants, causing irreparable or reversible agricultural coldness.

[0003] Fall armyworms are particularly harmful to corn plants. When feeding on corn leaves, they leave a large number of holes, making the veins look like window screens, and can even completely cut off 30-day-old seedlings along the base. For example, the patent with publication number CN114766494A provides an insecticide combination that can be used to control corn fall armyworms, including 1-50% active ingredients, 1-15% high molecular polymers, 1-10% vegetable oils, etc. The active ingredients include chlorantraniliprole and emamectin benzoate. The above scheme can improve the stability of the insecticide combination itself, improve the overall viscosity and multi-group heat resistance, but for the fall armyworms that exist in large numbers in corn fields, its insecticide effect is weak and the action time is short.

[0004] Therefore, in view of the serious problem of fall armyworm pests in corn fields, there is an urgent need for a material that can efficiently and continuously carry out pest control for corn fields with severe fall armyworm infestation and similar situations, so as to reduce the damage caused by fall armyworm to the growth and yield of corn crops. Summary of the invention

[0005] The technical problems to be solved by the present invention are:

[0006] At present, corn planted in most parts of my country is affected by pests such as fall armyworms, which results in corn being unable to grow healthily and low corn yields. Specifically, during corn growth, it begins to be attacked by a large number of fall armyworms from the seedling stage, while existing insecticides for fall armyworms have a short action time and poor insect control effect, and cannot effectively eliminate the fall armyworms and other pests that exist in large numbers in corn fields for a long time.

[0007] The technical solution adopted by the present invention is:

[0008] The present invention provides a method for removing pests in corn fields, wherein the above-mentioned pest-removing material is used to make a ground film, and the ground film is covered on the surface of the corn field during the seedling stage of the corn plants;

[0009] The insecticide material is a multi-layered granular material, which includes multiple levels of active insecticide layers and slow-release layers that are alternating layer by layer from the inner layer to the outer layer. The outer layer of the insecticide material is coated with zinc ion fertilizer and / or granular boron; the active insecticide layer includes an insecticide matrix, which is an insecticide that can remove corn field pests; and the slow-release layer includes a water-soluble slow-release material.

[0010] Preferably, the active insecticidal layer further comprises oil; further, the oil is selected from one or more of methylated vegetable oil, rosin-based vegetable oil or ethoxylated vegetable oil.

[0011] Preferably, the insecticide matrix is ​​selected from one or more of flumethrin, furanfenozide, chlorantraniliprole or chloranthroline chloride.

[0012] Preferably, the sustained-release material is selected from one or more of guar gum, xanthan gum or chitosan.

[0013] Preferably, the active insecticidal layer and the sustained-release layer on its outer layer are an insecticidal interlayer, and the insecticidal material comprises 3-8 layers of the insecticidal interlayer; in each layer of the insecticidal interlayer, the thickness of the sustained-release material is 5-50 μm.

[0014] Preferably, the thickness of the ground film is 0.015-0.028 mm.

[0015] Preferably, when sowing with seeds, soybean seedlings are interplanted between corn plants, and the ground film is covered after the seeds break through the soil; when sowing with seedlings, soybean seedlings are interplanted between corn seedlings, and the ground film is covered immediately after sowing.

[0016] The technical mechanism and beneficial effects adopted by the present invention are as follows:

[0017] According to the characteristics and differences of fall armyworm feeding on corn, the present invention provides an insecticide material capable of effectively eliminating fall armyworm existing in large quantities in corn fields and a preparation method thereof.

[0018] Specifically, the fall armyworm harms most crops by feeding on flower buds or growing points. Unlike other crops, the fall armyworm feeds on corn by drilling into corn ears or eating stems and leaves, thereby cutting off the base of the corn plant and preventing it from growing and bearing fruit normally. In addition, my country's fall armyworm population evolved from the hybridization of two biotypes, with the corn-type genome being dominant, so it prefers to eat corn, which is one of the reasons for the serious damage caused by fall armyworms in corn fields. Fall armyworms love to feed on the young and tender parts of corn plants, so fall armyworm infestations are mostly concentrated in the corn seedling stage, and the infestation lasts for a long time, which has a great impact on the growth of corn plants.

[0019] Based on the above situation, the present invention provides an insecticidal material with a multi-layer structure, in which adjacent layers are temporarily blocked by water-soluble sustained-release materials, so that the insecticidal material can be released layer by layer on the surface of crops. When pests such as fall armyworm feed on plant leaves, they will swallow the active compound with killing properties. The multi-layer insecticidal material can effectively prolong the time for the insecticidal material to disperse and act on pests such as fall armyworm, and has a longer time effectiveness.

[0020] In addition, the active compound is mixed with functional substances such as oils, which can reduce the volatilization of the insecticide matrix, ensure and prolong the effectiveness of the insecticide. The insecticide material is made into a mulch and covered on the surface of the plant to increase the effective area, and when pests such as fall armyworms are preyed on by their natural enemies, it can reduce the damage to corn plants caused by predation by natural enemies to a certain extent.

[0021] The pest control material and pest control method of the present invention can significantly improve the pest problems existing in current corn planting, and can also be widely used in the prevention and treatment of other crops or other pests. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be described clearly and completely below. If the specific conditions are not specified in the embodiments, they are carried out according to conventional conditions or conditions recommended by the manufacturer. If the manufacturer of the reagents or instruments used is not specified, they are all conventional products that can be purchased commercially.

[0023] The present invention provides an insecticide material for corn fields, which is a multi-layered granular material, and includes multiple levels of active insecticide layers and slow-release layers that are alternately arranged layer by layer from the inner layer to the outer layer, and the active insecticide layer includes an insecticide matrix, oil, dispersant, defoamer, antifreeze, etc. Among them, the insecticide matrix is ​​selected from one or more of flumethrin, furanthinozid, chlorantraniliprole, and chloranthroline chloride, and the oil is selected from one or more of methylated vegetable oil, rosin-based vegetable oil, and ethoxylated vegetable oil; the slow-release layer includes a slow-release material, and the slow-release material is selected from one or more of water-soluble colloids or water-soluble sugars, such as guar gum, xanthan gum, or chitosan, etc.

[0024] In the present invention, the active insecticidal layer and the outer sustained-release layer form an insecticidal interlayer, and the insecticidal material comprises 3-8 insecticidal interlayers; in each insecticidal interlayer, the sustained-release material has a thickness of 5-50 μm.

[0025] In the present invention, the surface of the slow-release material of the outermost layer of the insecticide material is also coated with one or more of fertilizers containing zinc ions and granular boron fertilizers. Since corn seedlings absorb a large amount of elements such as zinc and boron in the environment, the insecticide material can be more effectively promoted to adhere to the surface of the corn plant.

[0026] The present invention also provides a method for removing pests in corn fields, taking the above-mentioned pest control materials, and combining with the existing film-making technology, adopting more environmentally friendly biodegradable materials to make films, and those skilled in the art can directly select the film-making method proposed by Gansu Jiyang Plastic Co., Ltd. to make films, and the thickness of the ground film is controlled to be 0.015-0.028mm. When sowing seeds, corn plants are interplanted with soybean seedlings, and the ground film is covered after the seeds break the soil; when sowing seedlings, corn seedlings are interplanted with soybean seedlings, and the ground film is covered immediately after sowing.

[0027] Example 1

[0028] (1) Preparation of insecticide material

[0029] The active compound raw materials were measured by mass: 15 parts of flumethrin, 20 parts of furanfenozide, 3 parts of methylated vegetable oil, 2 parts of ethoxylated vegetable oil, 3.5 parts of fatty alcohol polyoxyethylene ether sulfate, 0.25 parts of silicone defoamer, 0.2 parts of xanthan gum, 4 parts of ethylene glycol and 1 part of benzoic acid.

[0030] The active composite raw materials measured above are placed in a premixer for blending, and the bulk particles are finely crushed to a particle size of about 0.15 mm to obtain an active composite; the active composite is taken, and guar gum slurry is sprayed on the surface, and the mixture is dried at room temperature, and the process is repeated for multiple times until the thickness of the guar gum layer is about 25 μm to obtain an intermediate product; the active composite is then taken, dissolved in ethanol to prepare a homogenate, and the mixture is applied to the surface of the intermediate product multiple times and dried until an active composite with a thickness of about 0.1 mm is formed, and the guar gum slurry is sprayed on the surface again, and the mixture is dried at room temperature, and the above operation is repeated for 4 times, and after the last spraying of guar gum slurry, the surface is fully coated with zinc fertilizer immediately, until the surface of the particles is covered with zinc fertilizer everywhere, so as to prepare an insecticide material coated with 5 layers of insecticide interlayers.

[0031] (2) Preparation of ground film

[0032] The prepared insecticide material is added to a sodium carboxymethyl cellulose aqueous solution, stirred and emulsified, homogenized under high pressure, dried, added to a mixture of partially modified soybean meal with polyvinyl alcohol and epichlorohydrin, and mixed evenly. The mixture is blown by a film blowing machine at 180°C to form a ground film with a thickness of about 0.02 mm.

[0033] (3) Pest control

[0034] A common soil environment for growing corn was selected, corn seeds were sown, and soybeans were interplanted for seedling raising. After the corn seeds sprouted, the prepared mulch was covered on the soil surface, and circular holes for crop growth were opened at the locations where corn and soybeans were planted. During the growth process, regular watering and other operations were carried out according to the common corn-soybean interplanting management method, and the stems and leaves of corn seedlings were randomly sampled, and the yield per mu was measured after the corn fruits grew and matured.

[0035] Example 2

[0036] The difference between this embodiment and embodiment 1 is that when preparing the insecticide material, chitosan is sprayed on the surface of the active composite, and the thickness of the chitosan layer is 40 μm.

[0037] Example 3

[0038] The difference between this embodiment and embodiment 1 is that 30 parts of chlorantraniliprole and 10 parts of dichlorothiazide are used instead of flumethrin and furanfenozide, 6 parts of rosin-based vegetable oil are used instead of methylated vegetable oil and ethoxylated vegetable oil, and granular boron is used instead of zinc fertilizer.

[0039] Example 4

[0040] The difference between this embodiment and embodiment 1 is that the insecticide material includes 8 insecticide interlayers, the thickness of the ground film is controlled at about 0.025 mm, and granular boron is used instead of zinc fertilizer.

[0041] Test example

[0042] The technical means of Examples 1-4 were used to eliminate insects in corn fields; at the same time, Comparative Examples 1-2 were set up, and Comparative Examples 1-2 respectively used phoxim and Hanke 140 to spray the corn fields regularly for insect elimination, and the rest of the management methods were the same as in Example 1. The above test results are summarized in the following Table 1:

[0043] Table 1 Deworming of Examples 1-4 and Comparative Examples

[0044]

[0045] The degree of plant insect pests in the corn seedling stage was measured by randomly sampling the stems and leaves of corn seedlings using ultraviolet light of about 365nm through lamp-luring method; the corn fruit yield was the yield per mu of land.

[0046] From the degree of plant pests in the seedling stage of corn and the yield of corn fruit recorded in Table 1 above, it can be seen that the number of moths killed by light trapping in Examples 1-4 is significantly lower than that in the comparative example, that is, the number of moths in the corn fields of Examples 1-4 is significantly smaller during the growth process, and the yield of corn fruit in Examples 1-4 is significantly higher than that in the comparative example. This shows that the pest control material and pest control method provided by the present invention have a significant improvement effect on the fall armyworm pest in corn fields.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for removing pests from corn fields, characterized in that: A mulch film is made of insecticide material and is covered on the surface of a corn field during the seedling stage of corn plants; The insecticide material is a multi-layered granular material, which includes multiple levels of active insecticide layers and slow-release layers that are alternately arranged layer by layer from the inner layer to the outer layer, and the outer layer of the insecticide material is coated with zinc ion fertilizer and / or granular boron; The active insecticide layer comprises an insecticide matrix and grease, wherein the insecticide matrix is ​​an insecticide capable of removing corn field pests; and the slow-release layer comprises a water-soluble slow-release material.

2. The method for removing pests from corn fields according to claim 1, characterized in that: The oil is selected from one or more of methylated vegetable oil, rosin-based vegetable oil or ethoxylated vegetable oil.

3. The method for removing pests from corn fields according to claim 1, characterized in that: The insecticide matrix is ​​selected from one or more of flumethrin, furanfenozide, chlorantraniliprole or chloranthroline chloride.

4. The method for removing pests from corn fields according to claim 1, characterized in that: The sustained-release material is selected from one or more of guar gum, xanthan gum or chitosan.

5. The method for removing pests from corn fields according to claim 1, characterized in that: The active insecticidal layer and the sustained-release layer on its outer layer form an insecticidal interlayer, and the insecticidal material comprises 3 to 8 layers of the insecticidal interlayer.

6. The method for removing pests from corn fields according to claim 1 or 5, characterized in that: In each of the insect-removing interlayers, the thickness of the sustained-release material is 5-50 μm.

7. The method for removing pests from corn fields according to claim 1, characterized in that: The thickness of the ground film is 0.015-0.028 mm.

8. The method for removing pests from corn fields according to claim 1, characterized in that: When sowing with seeds, soybean seedlings are interplanted between corn plants, and the ground film is covered after the seeds break through the soil; when sowing with seedlings, soybean seedlings are interplanted between corn seedlings, and the ground film is covered immediately after sowing.

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