White grub breeding method and device facilitating field test insect inoculation
By optimizing the soil substrate and environmental control, and combining it with a capsule-shaped insect rearing device, the problems of standardization and convenient insect inoculation in grub farming have been solved, improving the survival rate of grub larvae and the efficiency of field trials, thus meeting the needs of field trials.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-02-12
- Publication Date
- 2026-03-27
AI Technical Summary
Existing methods and equipment for raising grubs are difficult to standardize and make convenient, resulting in unstable insect source quality in field trials, easy damage to larvae during the insect inoculation process, low efficiency, and inability to meet the needs of field trials.
By optimizing the soil substrate formula and environmental control, and adopting a stratified isolation breeding design and capsule device, the grub larvae are synchronized in age and have uniform weight. The single-head feeding and capsule design eliminate the need to dig up the substrate and directly obtain the target insect source from the device, reducing mechanical damage.
This has enabled standardized breeding and convenient inoculation of grub larvae, improved the efficiency and survival rate of field trials, reduced breeding costs, provided a stable supply of insects, and laid a reliable foundation for research on field control technology for grubs.
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Figure CN121730253A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of agricultural pest control technology, and in particular to a method and apparatus for raising grubs that facilitates field trials. Background Technology
[0002] White grubs are a significant underground pest in agricultural production. They primarily feed on crop roots, tubers, and seeds in the soil, causing serious damage to various important crops such as corn, peanuts, soybeans, and potatoes. Mild damage can lead to weakened crop growth and yield reductions of 10%–20%, while severe damage can cause widespread seedling death and yield losses exceeding 30%. They are a key obstacle to stable and high agricultural yields. Conducting field research on white grub control techniques (such as biological control, chemical pesticide screening, and verification of insect-resistant varieties) is a crucial prerequisite for overcoming their harm. The accuracy and repeatability of these experiments highly depend on standardized, age-appropriate, healthy, and readily available white grub sources; that is, "on-demand inoculation" is necessary, ensuring that the grubs are not damaged and their vitality is not affected during the inoculation process.
[0003] Current methods and equipment for raising grubs face significant technical bottlenecks, making it difficult to meet the practical needs of field trials. Firstly, the standardization of grub sources is low. Traditional artificial climate chambers are used for small-batch rearing, but the equipment is expensive, the scale of rearing is limited, and larvae are prone to cannibalism due to overcrowding, making it difficult to accurately control grub density and provide uniform grub sources that meet experimental requirements in large quantities. Secondly, the process of introducing grubs is cumbersome and results in a high rate of grub injury. Existing rearing devices are mostly single-cavity structures, with larvae scattered in the soil or substrate. Introducing grubs in field trials requires manual digging of the substrate, which is not only time-consuming and labor-intensive but also easily causes mechanical damage to the larvae (such as broken legs or body wall damage), leading to decreased vitality and survival rate, directly affecting the reliability of experimental data. Thirdly, the rearing efficiency and practicality are insufficient. Some breeding methods do not take into account the underground habitat characteristics of grub larvae, the poor permeability of the substrate makes it easy to cause mold, or lack convenient environmental control (such as moisture retention and ventilation) design, resulting in a high larval mortality rate; at the same time, existing devices are not optimized for the "field infestation" scenario, and cannot achieve rapid and quantitative transfer of insect sources, resulting in poor adaptability.
[0004] Therefore, this invention provides a cleverly conceived and feasible solution for grub farming that balances "standardized farming" and "convenient inoculation": On the one hand, by optimizing the soil substrate formula, precisely controlling the farming environment, and implementing a stratified isolation farming design, the grub larvae are synchronized in age, have uniform weight, and stable vitality, ensuring the standardization of the source of insects; on the other hand, through the capsule design of the insect farming device, single-head farming is carried out, eliminating the tedious steps of turning over the substrate, and the target source of insects can be obtained directly and quickly from the device. Moreover, the inoculation process is free from mechanical damage, which greatly improves the inoculation efficiency and survival rate in field trials, a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention
[0005] To address the aforementioned technical problems, this invention provides a grub rearing method and device that facilitates field trials and inoculation. This solution combines standardized rearing with convenient inoculation: on one hand, by optimizing soil substrate formulation, precisely controlling the rearing environment, and implementing a tiered isolation rearing design, it ensures synchronized grub larval development, uniform weight, and stable vitality, guaranteeing standardized larval sources; on the other hand, the capsule-like design of the rearing device allows for single-larval rearing, eliminating the tedious step of digging up the substrate. Target larval sources can be quickly and directly obtained from the device, and the inoculation process is free of mechanical damage, significantly improving the efficiency and survival rate of inoculation in field trials.
[0006] The present invention adopts the following technical solution: A method for raising grubs that facilitates field trials includes the following steps: Step 1: Prepare the soil substrate for indoor grub breeding; Step two: trap adult grubs with field lights and place them in oviposition boxes containing a certain amount of moist soil; Step 3: Place leaves that adult grubs like to eat into the egg-laying box so that the adults can feed on them. After the adults lay their eggs in the soil, remove the eggs. Step 4: Place the single insect eggs picked out in Step 3 into the larval rearing capsule, then fill the capsule with the soil substrate prepared in Step 1, close the capsule lid, and maintain suitable environmental humidity and temperature for larval rearing. Step 5: After the larvae have been raised to the age required for the experiment, the capsules are introduced into the experimental field according to the required number of larvae.
[0007] As a further optimization of the above-mentioned grub breeding method that facilitates field trials, the soil substrate preparation method in step one is as follows: the soil, river sand, and animal manure are sun-dried and disinfected with insecticide powder, then crushed into fine powder particles with a particle diameter of less than 0.3 cm. The above raw materials are then mixed evenly according to the component ratio, and the mixture is covered with plastic sheeting and kept for 2 days. After that, the plastic sheeting is removed, and the mixed substrate is turned over twice before use.
[0008] As a further optimization of the above-mentioned grub breeding method that facilitates field trials, the soil substrate is composed of the following parts by weight: 30-60 parts soil, 5-10 parts river sand, 20-30 parts animal manure, 0.001-0.01 parts insecticide powder, and 15-20 parts water.
[0009] As a further optimization of the above-mentioned grub breeding method that facilitates field trials, in step two, the volume content of the moist soil in the oviposition box is 1 / 4 to 1 / 3, and the water content is 15% to 20%.
[0010] As a further optimization of the above-mentioned grub breeding method that facilitates field trials, the humidity of the capsule rearing environment in step four is 60-80%, and the ambient temperature is 25-28℃.
[0011] As a further optimization of the above-mentioned grub breeding method that facilitates field trials, the inoculation method in step five is as follows: In the field, insert a wooden stick into a hole at least 10cm deep in the ground. Rotate the stick until the hole diameter is slightly larger than the capsule diameter, then remove the stick, take out the capsule containing the larva, tear off the isolation strip on the capsule, and place it into the hole in the ground, ensuring that the capsule is placed to the bottom of the hole. Then, gently seal the hole with loose soil. The soil moisture content in the field should be maintained at 15-20% during inoculation.
[0012] An insect rearing device includes an insect rearing cabinet, a single-head rearing capsule, an insect rearing box drawer, a water collection trough, and a spray pipe. The insect rearing cabinet is a rectangular hollow structure with several layers of insect rearing box drawers arranged in parallel on the cabinet. The single-head rearing capsule is placed inside the insect rearing box drawer. Spray pipes are installed on the top and side walls of the insect rearing cabinet. A water collection trough is installed at the bottom of the insect rearing cabinet, and a breathable net is installed at the top of the insect rearing cabinet. The spray pipes are used to spray moisture into the insect rearing cabinet, and the overflowing water flows into the water collection trough for storage. The single-head rearing capsule includes a capsule body and a capsule cap that works with it. The capsule cap has ventilation holes. The inner and outer surfaces of the capsule body and the capsule cap are uniformly coated with a waterproof wax layer. Before the waterproof wax layer is applied, the outer walls of the capsule body and the capsule cap are affixed with an easy-to-remove isolation strip. When the larvae are introduced into the experimental field, the isolation strip is removed, and the capsule body loses its waterproof function, allowing the capsule body to break down during the degradation process in the soil, and the larvae crawl out of the capsule body and enter the soil to grow.
[0013] As a further optimization of the above-mentioned insect raising device, the insect raising box drawer includes a box body, a support, and a conical placement hole for placing single-head feeding capsules. The box body is an open rectangular box body, and the bottom of the box body is provided with a support around its four sides.
[0014] As a further optimization of the above-mentioned insect rearing device, the single-head rearing capsule is made of starch, toughening auxiliary material and cross-linking agent, wherein the starch is corn starch or potato starch, the toughening auxiliary material is sodium carboxymethyl cellulose or sodium alginate, and the cross-linking agent is calcium chloride solution.
[0015] As a further optimization of the above-mentioned insect raising device, the waterproof wax layer is composed of beeswax and carnauba wax, with a mass ratio of beeswax to carnauba wax of 1:2.
[0016] Beneficial effects Compared with the prior art, the present invention has significant advantages and beneficial effects, achieving considerable technological progress and practicality, and possesses broad application value. It has at least the following advantages: 1. This invention provides a grub farming solution that combines "standardized farming" and "convenient larval inoculation": On the one hand, by optimizing the soil substrate formula, precisely controlling the farming environment (temperature 22-25℃, humidity 60%-70%), and implementing a layered isolation farming design, it achieves synchronized grub larval instars, uniform weight, and stable vitality, ensuring standardized larval sources; on the other hand, through the capsule design of the larval farming device, single-livestock farming is carried out, eliminating the tedious steps of turning over the substrate, allowing for direct and rapid acquisition of target larval sources from the device, and the larval inoculation process is free of mechanical damage, significantly improving the efficiency and survival rate of larval inoculation in field trials.
[0017] 2. This invention not only fills the gap in existing grub farming technology regarding the insufficient connection between "standardized cultivation" and "convenient inoculation," but also reduces farming costs and improves the utilization rate of insect resources. It provides a stable and reliable experimental basis for the screening, verification, and promotion of grub field control technologies, and has significant practical implications for promoting the development of green control technologies for underground agricultural pests. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the main structure of a single-head feeding capsule; Figure 2 This is a schematic diagram of the cross-sectional structure of a single-head feeding capsule; Figure 3 This is a schematic diagram of the main structure of the capsule insect rearing box; Figure 4 This is a schematic diagram of the three-dimensional structure of the insect-raising cabinet; Figure 5 This is a schematic diagram of the cross-sectional structure of the insect-raising cabinet; In the picture: 1. Capsule body, 2. Capsule cap, 3. Ventilation hole, 4. Separator strip, 5. Waterproof wax layer, 6. Box body, 7. Support, 8. Conical placement hole, 9. Insect raising box drawer, 10. Insect raising cabinet, 11. Water collection trough, 12. Spray pipe, 13. Ventilation net. Detailed Implementation
[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments and accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of protection. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art, without creative effort, including formal modifications to the technical solutions described in the following embodiments or equivalent substitutions of some technical features, based on the inspiration of the present invention, are within the scope of protection of the present invention.
[0020] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
[0021] A method for raising grubs that facilitates field trials includes the following steps: Step 1: Prepare the soil substrate for indoor grub breeding; Step two: trap adult grubs with field lights and place them in oviposition boxes containing a certain amount of moist soil; Step 3: Place leaves that adult grubs like to eat into the egg-laying box so that the adults can feed on them. After the adults lay their eggs in the soil, remove the eggs. Step 4: Place the single insect eggs picked out in Step 3 into a single-head rearing capsule for larvae rearing. Then fill the capsule with the soil substrate prepared in Step 1, close the capsule lid, and maintain suitable environmental humidity and temperature for larvae rearing. Step 5: After the larvae have been raised to the age required for the experiment, the capsules are introduced into the experimental field according to the required number of larvae.
[0022] The method for preparing the soil substrate in step one is as follows: the soil, river sand, and animal manure are sun-dried and disinfected with carbendazim powder for insects, and then crushed into fine powder particles with a particle diameter of less than 0.3 cm. The above raw materials are then mixed evenly according to the component ratio, and the mixture is covered with plastic sheeting and kept for 2 days. After that, the plastic sheeting is removed, and the mixed substrate is turned over twice before it is ready for use.
[0023] The soil matrix is composed of the following parts by weight: 30-60 parts soil, 5-10 parts river sand, 20-30 parts animal manure, 0.001-0.01 parts carbendazim powder for insects, and 15-20 parts water.
[0024] In step two, the volume content of moist soil in the spawning box is 1 / 4 to 1 / 3, and the water content is 15% to 20%.
[0025] In step four, the humidity of the single-head feeding capsule is 60-80%, and the temperature is 25-28℃.
[0026] The method for receiving the larvae in step five is as follows: In the field, insert a wooden stick into a hole at least 10cm deep in the ground. Rotate the stick until the hole diameter is slightly larger than the capsule diameter. Remove the stick, take out the capsule containing the larvae, tear off the isolation strip on the capsule, and place it into the hole in the ground, ensuring that the capsule is placed to the bottom of the hole. Then, gently seal the hole with loose soil. When receiving the larvae, the soil moisture content in the field should be maintained at 15-20%.
[0027] like Figure 1 , 2 As shown, Figure 1 This is a schematic diagram of the main structure of a single-head feeding capsule; Figure 2 This is a schematic diagram of the exploded structure of a single-head rearing capsule. The single-head rearing capsule includes a capsule body 1 and a capsule cap 2 used in conjunction with it. The capsule cap 2 is provided with a vent hole 3. The inner and outer surfaces of the capsule body 1 and the capsule cap 2 are uniformly coated with a waterproof wax layer 5. Before the waterproof wax layer 5 is applied, a strip 4 that is easy to tear off is attached to the outer wall of the capsule body 1 and the capsule cap 2. When the larvae are introduced into the experimental field, the strip 4 is torn off so that after the capsule body 1 is successfully degraded in the soil, the larvae crawl out of the capsule body 1 and enter the soil to grow.
[0028] like Figure 3 As shown, Figure 3 This is a schematic diagram of the main structure of the capsule insect rearing box; the insect rearing box drawer 9 includes a box body 6, a support 7, and a conical placement hole 8 for placing single-head rearing capsules. The box body 6 is an open rectangular box body, and the support 7 is provided at the bottom of the four sides of the box body 6.
[0029] like Figure 4 , 5 As shown, the insect raising device includes an insect raising cabinet 10, a single-head breeding capsule, an insect raising box drawer 9, a water receiving trough 11, and a spray pipe 12. The insect raising cabinet 10 is a rectangular hollow structure. Several layers of insect raising box drawers 9 are arranged in parallel on the insect raising cabinet 10. The single-head breeding capsule is placed inside the insect raising box drawer 9. The spray pipe 12 is installed on the top and side walls of the insect raising cabinet 10. The water receiving trough 11 is installed at the bottom of the insect raising cabinet 10. The top of the insect raising cabinet 10 is equipped with a breathable net 13. The spray pipe 12 is used to spray moisture into the insect raising cabinet 10. The overflowing water flows into the water receiving trough 11 for storage.
[0030] The single-head feeding capsule is made of starch, toughening additives, and cross-linking agents. The starch is corn starch or potato starch, the toughening additives are sodium carboxymethyl cellulose or sodium alginate, and the cross-linking agent is calcium chloride solution.
[0031] The waterproof wax layer 5 is composed of beeswax and carnauba wax, with a mass ratio of 1:2.
[0032] In practical applications, the manufacturing process of single-head rearing capsules is as follows: Materials can be 100% biodegradable, non-polluting to soil, and non-toxic to insects, such as corn starch / potato starch with sodium carboxymethyl cellulose (toughening agent) or sodium alginate with calcium chloride solution (cross-linking agent). These materials slowly degrade and release nutrients in the soil as needed. The manufacturing method follows traditional procedures. To facilitate easy degradation in the soil and prevent deformation and degradation during insect rearing, a release strip can be locally attached to the capsule cap and outer surface. Then, a 1:2 mixture of beeswax and carnauba wax is heated and evenly coated onto the inner and outer surfaces of the capsule for waterproofing. The release strip can be removed when degradation is required.
[0033] Based on the table, the following are the specific implementation process and results of determining the survival rate of grubs in indoor rearing under different feeding methods and determining the survival rate in the field under different inoculation methods.
[0034] 1. Determination of the survival rate of grubs raised indoors by different rearing methods: The experiment included three treatments: single-head rearing in capsules, traditional rearing in formulated soil substrate, and traditional rearing. Each treatment was repeated three times, with 200 eggs inoculated per replicate.
[0035] Traditional breeding method: Add 1 / 3 of the soil without other additives to the insect breeding box (30cm high x 50cm long x 30cm wide), then place the insect eggs evenly on the surface, and add soil to 2 / 3 of the height of the box. Cover the box with a venting hole. Then, spray water on the surface of the soil substrate as the breeding time and soil moisture increase to maintain soil moisture.
[0036] Traditional feeding method with formulated soil substrate: The traditional feeding method is based on replacing the soil with formulated soil substrate, and the other methods are the same.
[0037] Capsule single-head rearing method: Place the insect eggs one by one into a special capsule for larval rearing, fill it with the prepared soil substrate, cover the capsule, place it on the rearing rack, and then place it in a special capsule rearing box for rearing.
[0038] The experimental study is as follows: The survival rate of larvae was determined after 20 and 30 days of rearing under different treatments.
[0039] Table 1 shows the results of measuring the survival rate of grubs raised indoors under different rearing methods. As shown in the table above, the survival rate of grub larvae after 20 days of traditional rearing was 68.3%, and after 30 days it was 56.7%, significantly lower than the survival rates of soil substrate rearing and capsule single-larva rearing. The survival rate of larvae after 20 days of traditional soil substrate rearing was 77.3%, and after 30 days it was 72.5.7%, significantly lower than the survival rate of capsule single-larva rearing, but 13.2% and 27.9% higher than traditional rearing, respectively. The survival rate of larvae after 20 days of capsule single-larva rearing was 87.0%, and after 30 days it was 85.3%, significantly higher than the other two rearing methods, 27.4% and 50.4% higher than traditional rearing, respectively, and 12.5% and 17.7% higher than traditional soil substrate rearing, respectively. This indicates that feeding larvae in soil substrates and supplementing them with organic matter improves their survival rate. However, feeding larvae individually in capsules not only supplements organic matter but also reduces cannibalism among larvae due to high larval density, thus further improving the survival rate.
[0040] 2. Determination of field survival rate for different inoculation methods: The experiment included two treatments in the field: traditional inoculation and direct inoculation with insect-rearing capsules. Each treatment contained 90 larvae, with three replicates per treatment and 30 larvae per replicate. The plot area was 30 m². 2 When inoculating the field with grubs, the soil moisture content should be maintained at around 15-20%. Ten days after inoculation, all grubs in each plot should be dug up to investigate the number of live grubs and calculate the survival rate.
[0041] Traditional inoculation method: Second-instar grub larvae obtained through traditional indoor soil substrate rearing methods are removed from the rearing box and placed in a box containing a small amount of soil. They are then transferred to the field for inoculation, at a rate of [missing information - likely a unit of area] per m². 2 One larva is used to receive the larva. In the field, a wooden stick is inserted into the ground more than 10cm deep. The stick is rotated until the hole is more than 10cm in diameter. The stick is then removed, and the larva is placed into the hole in the ground. The hole is then gently sealed with soil.
[0042] Method for receiving insects using insect-rearing capsules: Take out the insect-rearing capsule containing 2nd instar larvae from the insect-rearing capsule box. To receive the insects, insert a wooden stick into the ground more than 10cm deep in the field. Rotate the stick until the hole diameter is slightly larger than the capsule diameter. Take out the stick, take out the capsule containing the insect, tear off the isolation strip, and place it into the hole in the ground, ensuring that the capsule is placed to the bottom of the hole. Then, gently seal the hole with soil.
[0043] Table 2 shows the field survival rate results for different inoculation methods. As shown in the table, the survival rate of traditional inoculation was only 37.8% 10 days after inoculation, while the survival rate of capsule inoculation reached 76.7%, representing a 102.9% increase in survival rate compared to traditional inoculation. This indicates that in traditional inoculation, the larvae are easily damaged during the selection and inoculation processes in the rearing box, and the environment changes significantly throughout the inoculation process, leading to a high mortality rate for grub larvae. However, in capsule inoculation, the larvae remain in their original environment throughout the process, minimizing the impact on their bodies. After inoculation into the soil, some of the original soil matrix remains during the capsule degradation process, making it easier for the grub larvae to adapt to the field environment, thus improving the survival rate of grub larvae.
[0044] The preferred embodiments and examples of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments and examples. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the concept of the present invention.
Claims
1. A method for raising grubs that facilitates field trials and insect inoculation, characterized in that: Includes the following steps, Step 1: Prepare the soil substrate for indoor grub breeding; Step two: trap adult grubs with field lights and place them in oviposition boxes containing a certain amount of moist soil; Step 3: Place leaves that adult grubs like to eat into the egg-laying box so that the adults can feed on them. After the adults lay their eggs in the soil, remove the eggs. Step 4: Place the single insect eggs picked out in Step 3 into a single-head rearing capsule for larvae rearing. Then fill the capsule with the soil substrate prepared in Step 1, close the capsule lid, and maintain suitable environmental humidity and temperature for larvae rearing. Step 5: After the larvae have been raised to the age required for the experiment, the capsules are introduced into the experimental field according to the required number of larvae.
2. The method for raising grubs that facilitates field trials and insect inoculation as described in claim 1, characterized in that: The method for preparing the soil substrate in step one is as follows: the soil, river sand, and animal manure are sun-dried and disinfected with carbendazim powder for insects, and then crushed into fine powder particles with a particle diameter of less than 0.3 cm. The above raw materials are then mixed evenly according to the component ratio, and the mixture is covered with plastic sheeting and kept for 2 days. After that, the plastic sheeting is removed, and the mixed substrate is turned over twice before it is ready for use.
3. The method for raising grubs that facilitates field trials and insect inoculation, as described in claim 2, is characterized in that: The soil matrix is composed of the following parts by weight: 30-60 parts soil, 5-10 parts river sand, 20-30 parts animal manure, 0.001-0.01 parts carbendazim powder for insects, and 15-20 parts water.
4. The method for raising grubs that facilitates field trials and insect inoculation, as described in claim 1, is characterized in that: In step two, the volume content of moist soil in the spawning box is 1 / 4 to 1 / 3, and the water content is 15% to 20%.
5. The method for raising grubs that facilitates field trials and insect inoculation, as described in claim 1, is characterized in that: In step four, the humidity of the single-head feeding capsule is 60-80%, and the temperature is 25-28℃.
6. The method for raising grubs that facilitates field trials and insect inoculation as described in claim 1, characterized in that: The method for receiving the larvae in step five is as follows: In the field, insert a wooden stick into a hole at least 10cm deep in the ground. Rotate the stick until the hole diameter is slightly larger than the capsule diameter. Remove the stick, take out the capsule containing the larvae, tear off the isolation strip on the capsule, and place it into the hole in the ground, ensuring that the capsule is placed to the bottom of the hole. Then, gently seal the hole with loose soil. When receiving the larvae, the soil moisture content in the field should be maintained at 15-20%.
7. An insect-raising device employing the grub farming method according to any one of claims 1 to 6, characterized in that: The system includes an insect rearing cabinet (10), a single-head rearing capsule, an insect rearing box drawer (9), a water tank (11), and a spray pipe (12). The insect rearing cabinet (10) is a rectangular hollow structure. Several layers of insect rearing box drawers (9) are arranged parallel to each other on the insect rearing cabinet (10). The single-head rearing capsule is placed inside the insect rearing box drawer (9). Spray pipes (12) are installed on the top and side walls of the insect rearing cabinet (10). A water tank (11) is installed at the bottom of the insect rearing cabinet (10). A breathable net (13) is installed on the top of the insect rearing cabinet (10). The spray pipes (12) are used to spray moisture into the insect rearing cabinet (10) and overflow. The water flows down into the water collection tank (11) for storage; the single-head rearing capsule includes a capsule body (1) and a capsule cap (2) used in conjunction with it. The capsule cap (2) is provided with a vent hole (3). The inner and outer surfaces of the capsule body (1) and the capsule cap (2) are uniformly coated with a waterproof wax layer (5). Before the outer wall of the capsule body (1) and the capsule cap (2) is coated with the waterproof wax layer (5), a strip of isolation (4) that is easy to tear off is pasted on it. When the larvae are introduced into the experimental field, the isolation strip (4) is torn off so that after the capsule body (1) is successfully degraded in the soil, the larvae crawl out of the capsule body (1) and enter the soil to grow.
8. The grub rearing device as described in claim 7, characterized in that: The insect rearing box drawer (9) includes a box body (6), a support (7) and a conical placement hole (8) for placing a single-head rearing capsule. The box body (6) is an open rectangular box body, and the support (7) is provided at the bottom of the four sides of the box body (6).
9. The grub rearing device as described in claim 7, characterized in that: The single-head feeding capsule is made of starch, toughening additives, and cross-linking agents. The starch is corn starch or potato starch, the toughening additives are sodium carboxymethyl cellulose or sodium alginate, and the cross-linking agent is calcium chloride solution.
10. The grub rearing device as described in claim 7, characterized in that: The waterproof wax layer (5) consists of beeswax and carnauba wax, with a mass ratio of 1:2.