A multi-layered net trap for the asian longhorned beetle
By designing a multi-layered poplar longhorn beetle trapping net, the limitations of the impact plate trap in capturing longhorn beetles with a large body length span are solved by utilizing the multi-layered net structure and two-stage induction method, thus achieving effective capture and prevention of escape of adult longhorn beetles.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JILIN AGRICULTURAL UNIV
- Filing Date
- 2025-08-25
- Publication Date
- 2026-07-14
AI Technical Summary
Existing bumper-type longhorn beetle catchers have limitations when catching longhorn beetles with a large body length span, resulting in a small capture range or the beetles escaping.
A multi-layered poplar longhorn beetle trapping net is designed, employing a multi-layered net structure and a two-stage induction method. Elastic nylon ropes are used to connect each layer of the net, and a combination structure of folded cross plates and induction chambers is used to achieve multi-layered capture and prevent escape of adult longhorn beetles.
It expanded the capture range, improved the capture success rate, ensured the effective capture of larger longhorn beetles, and effectively prevented their escape.
Smart Images
Figure CN224482716U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of insect capture technology, specifically relating to a multi-layered poplar longhorn beetle trapping net. Background Technology
[0002] Longhorn beetles are a significant pest in forestry production. The most mature existing longhorn beetle trapping device is the impact plate trap. This device induces longhorn beetles in their mating period to strike a plate, causing them to fall into a cover located below the plate. Finally, the cone-shaped cover structure allows the longhorn beetles to slide into a trap bottle located below the cover, thus capturing them. A patent application with patent number CN201721690328.6, entitled "A Retractable Assembled Longhorn Beetle Trapper for Forest Use," discloses a longhorn beetle trap with a similar structure. However, this trap also has certain drawbacks. Firstly, the longhorn beetles in their mating period are generally molted adults. Longhorn beetles possess a certain degree of flight capability. The adult body size varies considerably among some species; for example, the adult Poplar Red-necked Longhorn Beetle (which becomes an adult after molting) has a body length between 18-32 mm. Traditional ram-plate traps have limited entrance sizes. If the entrance is too large, while it ensures a wider capture range, smaller beetles can easily escape. If the entrance is too small, while it effectively prevents escape, the capture range is limited, making it difficult to effectively capture larger beetles of the same order. This imposes certain limitations on longhorn beetle trapping. Developing a multi-layered Poplar Longhorn Beetle trapping net is highly practical in addressing these limitations. Utility Model Content
[0003] In order to solve the problem that existing bumper-type longhorn beetle catchers have limitations in catching longhorn beetles with a large body length span, this utility model provides a multi-layer poplar longhorn beetle trapping net.
[0004] A multi-layered poplar longhorn beetle trapping net is hung on the branches of a poplar tree. The net includes a top fixed cover with a hook detachably connected to the top for hanging on the poplar branches. A folding cross plate is detachably connected to the bottom of the top fixed cover, and the folding cross plate has a hook for hanging an attractant. Below the folding cross plate is a multi-layered net cover, the top of which is detachably connected to the bottom of the folding cross plate via a bottom fixing ring. The bottom of the multi-layered net cover is detachably connected to an induction chamber for secondary induction of the longhorn beetles. The longhorn beetles are first induced by the attractant located in the folding cross plate, causing them to collide with the folding cross plate and fall into the multi-layered net cover. The longhorn beetles are then secondly induced by the attractant located in the induction chamber, causing them to move layer by layer towards the bottom of the multi-layered net cover.
[0005] Furthermore, the bottom fixing ring includes a fixing ring body, the inside of which is fixedly connected with a connecting cross for disassembly connection with the folding cross plate, and the bottom of the fixing ring body is fixedly connected with a first connecting ring for disassembly connection with the multi-layer mesh cover.
[0006] Furthermore, the connecting cross includes a central disc, and four support beams for supporting the folding cross plate are provided equidistantly along the circumference between the central disc and the fixing ring body. Each support beam has a slot at its top that engages with one side of the folding cross plate.
[0007] Furthermore, the bottom of the central disc is detachably connected in the vertical direction to a central support shaft for assisting in fixing the multi-layered mesh cover;
[0008] Furthermore, the multi-layer mesh includes N ring-shaped wire meshes arranged vertically, where N is a positive integer greater than 2. Adjacent ring-shaped wire meshes are connected by a spacer unit. The uppermost ring-shaped wire mesh is detachably connected to the first connecting ring, and the lowermost ring-shaped wire mesh is detachably connected to the induction chamber through the bottom partition unit.
[0009] Furthermore, the spacer unit includes a spacer ring, and a first cross rod is fixedly connected inside the spacer ring. The first cross rod divides the interior of the spacer ring into four regions. In each region, multiple diagonally pulled nylon ropes are arranged at equal intervals from the center of the spacer ring to the edge of the spacer ring. Both ends of each nylon rope are fixedly connected to the first cross rod. A second connecting ring for disassembly and connection with the ring-shaped wire mesh is coaxially fixed at the upper and lower ends of the spacer ring.
[0010] Furthermore, the bottom partition unit includes a partition ring, and a second cross bar is fixedly connected inside the partition ring. The second cross bar divides the interior of the partition ring into four regions. Each region is provided with a bottom wire mesh. The bottom wire mesh is fixedly connected to the second cross bar and the inner wall of the partition ring. A third connecting ring is coaxially fixed to the top of the partition ring for detachable connection with the annular wire mesh. A fourth connecting ring is coaxially fixed to the bottom of the partition ring for detachable connection with the induction chamber.
[0011] Furthermore, the induction chamber includes a chamber body, the top of which is designed to be open for detachable connection with the No. 4 connecting ring, and a fixed base is installed at the bottom of the chamber body. An induction tube for placing the induction agent used for secondary induction is detachably connected to the fixed base.
[0012] Furthermore, at least one trapping light source is installed at the bottom of the induction chamber, and a battery for powering the trapping light source is embedded inside the mounting base. The control switch for the trapping light source is integrated on the outer wall of the induction chamber.
[0013] The beneficial effects of this application compared to the prior art are:
[0014] 1. This utility model provides a multi-layered poplar longhorn beetle trapping net, which optimizes the insect-trapping bottle structure of the traditional bumper-type longhorn beetle trap by replacing the traditional insect-trapping bottle with a multi-layered net. The layers of the multi-layered net are woven with elastic nylon ropes, which facilitates the longhorn beetles to crawl through the gaps in the nylon ropes to the lower layers. This design can meet the needs of capturing longhorn beetles with a large body length span. After the longhorn beetles crawl, the nylon ropes will return to their original shape under the action of elasticity. Even if the adult longhorn beetles have the ability to fly, they will not fly from the lower layer of the net to the upper layer of the net, which has a good anti-escape effect. While expanding the longhorn beetle capture range, it also ensures the reliability of the capture.
[0015] 2. The multi-layered poplar longhorn beetle trapping net provided by this utility model adopts a two-stage induction and capture method. First, an induction method is used to attract adult longhorn beetles into the capture area, and after hitting the board, they smoothly slide into the multi-layered net. Through a secondary induction method located below the multi-layered net, the longhorn beetles are further encouraged to crawl towards the bottom of the multi-layered net. Furthermore, the elastic nylon rope can effectively prevent the captured longhorn beetles from escaping, thereby improving the success rate of longhorn beetle capture. Attached Figure Description
[0016] Figure 1 This is a front view schematic diagram of the multi-layered poplar longhorn beetle trapping net described in this application;
[0017] Figure 2 This is a front view schematic diagram of the bottom fixing ring in the multi-layer poplar longhorn beetle trapping net described in this application;
[0018] Figure 3 This is a top view of the bottom fixing ring in the multi-layer poplar longhorn beetle trapping net described in this application;
[0019] Figure 4 This is a schematic diagram of the bottom fixing ring in the multi-layer poplar longhorn beetle trapping net described in this application, oriented AA.
[0020] Figure 5 This is a top view of the middle partition unit of the multi-layer poplar longhorn beetle trapping net described in this application;
[0021] Figure 6 This is a front view schematic diagram of the middle partition unit of the multi-layer poplar longhorn beetle trapping net described in this application;
[0022] Figure 7 This is a schematic cross-sectional view of the middle partition unit of the multi-layer poplar longhorn beetle trapping net described in this application;
[0023] Figure 8 This is a top view of the bottom partition unit in the multi-layer poplar longhorn beetle trapping net described in this application;
[0024] Figure 9 This is a front view schematic diagram of the bottom dividing unit in the multi-layer poplar longhorn beetle trapping net described in this application;
[0025] Figure 10 This is a schematic cross-sectional view of the bottom dividing unit in the multi-layer poplar longhorn beetle trapping net described in this application;
[0026] Figure 11 This is a front view schematic diagram of the induction chamber in the multi-layered poplar longhorn beetle trapping net described in this application;
[0027] Figure 12 This is a schematic cross-sectional view of the induction chamber in the multi-layered poplar longhorn beetle trapping net described in this application;
[0028] Figure 13 This is a front view schematic diagram of the induction cylinder cover in the multi-layer poplar longhorn beetle trapping net described in this application;
[0029] Figure 14 This is a schematic diagram of the interior of the induction chamber in the multi-layered poplar longhorn beetle trapping net described in this application. Detailed Implementation
[0030] Specific implementation method one: Combining Figures 1 to 13 This embodiment describes a multi-layered poplar longhorn beetle trapping net. The net is hung on the branches of a poplar tree and includes a top fixed cover 1. The top of the top fixed cover 1 is detachably connected to a hook 2 for hanging on the poplar branches. The bottom of the top fixed cover 1 is detachably connected to a folding cross plate 3, which has a hook for hanging an attractant. Below the folding cross plate 3 is a multi-layered net. The top of the multi-layered net is detachably connected to the bottom of the folding cross plate 3 via a bottom fixed ring 4. The bottom of the multi-layered net is detachably connected to an induction chamber 8 for secondary induction of the longhorn beetles. The longhorn beetles are first induced by the attractant located in the folding cross plate 3, causing them to collide with the folding cross plate 3 and fall into the multi-layered net. The longhorn beetles are then secondly induced by the attractant located in the induction chamber 8, causing them to move layer by layer towards the bottom of the multi-layered net.
[0031] The bottom fixing ring 4 includes a fixing ring body 41, and a connecting cross for disassembly and connection with the folding cross plate 3 is fixed inside the fixing ring body 41. A first connecting ring 46 for disassembly and connection with the multi-layer mesh cover is fixed at the bottom of the fixing ring body 41.
[0032] The connecting cross includes a central circular piece 42. Four support beams 43 are provided equidistantly along the circumference between the central circular piece 42 and the fixing ring body 41 to support the folding cross plate 3. Each support beam 43 has a slot 44 at its top that is inserted into one side of the folding cross plate 3.
[0033] The multi-layer mesh includes N ring-shaped wire meshes 5 arranged vertically, where N is a positive integer greater than 2. Adjacent ring-shaped wire meshes 5 are connected by a spacer unit 6. The uppermost ring-shaped wire mesh 5 is detachably connected to the first connecting ring 46, and the lowermost ring-shaped wire mesh 5 is detachably connected to the induction chamber 8 through the bottom partition unit 7.
[0034] The spacer unit 6 includes a spacer ring 61. A cross bar is fixed inside the spacer ring 61. The cross bar divides the interior of the spacer ring 61 into four regions. In each region, multiple diagonally pulled nylon ropes 64 are arranged at equal intervals from the center of the spacer ring 61 to the edge of the spacer ring 61. Both ends of each nylon rope 64 are fixedly connected to the cross bar. A second connecting ring 65 for disassembly and connection with the annular wire mesh 5 is coaxially fixed at the upper and lower ends of the spacer ring 61.
[0035] The bottom partition unit 7 includes a partition ring 71. A second cross bar is fixedly connected inside the partition ring 71. The second cross bar divides the interior of the partition ring 71 into four regions. Each region is provided with a bottom wire mesh 74. The bottom wire mesh 74 is fixedly connected to the second cross bar and the inner wall of the partition ring 71. A third connecting ring 75 is coaxially fixed to the top of the partition ring 71 for detachable connection with the annular wire mesh 5. A fourth connecting ring 76 is coaxially fixed to the bottom of the partition ring 71 for detachable connection with the induction chamber 8.
[0036] The induction chamber 8 includes a chamber body 81. The top of the chamber body 81 is designed to be open for detachable connection with the fourth connecting ring 76. A fixing seat 83 is installed at the bottom of the chamber body 81. An induction tube for placing the induction agent used for secondary induction is detachably connected to the fixing seat 83.
[0037] This embodiment provides a multi-layer poplar longhorn beetle trapping net, which is an improvement on the existing bumper-type longhorn beetle trap. The purpose is to solve the problem that the diameter of the trapping bottle in the existing bumper-type longhorn beetle trap limits the capture of longhorn beetles with a large adult body length span. The top fixing cover 1, hook 2 and folding cross plate 3 in this application all adopt the structure of the prior art, which will not be described in detail here.
[0038] The longhorn beetle attractant used in this embodiment is mainly a chemical attractant, which mainly uses the sexual information released by simulated longhorn beetles to attract adults in the mating period. It can also be a sugar-vinegar liquid made of brown sugar, vinegar, wine and water in a certain ratio (generally the mass fraction ratio of the four is 1:4:1:16), which is used as a food attractant to attract adults to feed. The purpose of designing the induction structure is to attract longhorn beetles that gather on the outer surface of the tree trunk to achieve the purpose of efficient capture.
[0039] The bottom fixing ring 4 is a device for fixing the bottom of the folding cross plate 3. It consists of two parts. The first part is a connecting cross located inside the fixing ring body 41. The top of the connecting cross is machined with a slot that matches the folding cross plate 3. It is used to connect and disconnect the folding cross plate 3 to the bottom of the folding cross plate 3, ensuring that the folding cross plate 3 is always in the open state during operation. The second part is a first connecting ring 46 located at the bottom of the fixing ring body 41. The first connecting ring 46 is used to fix the annular wire mesh 5. The specific fixing method is bolt clamping. Multiple threaded holes are machined equidistantly along the circumference on the outer circular wall of the first connecting ring 46. Each threaded hole is equipped with a corresponding bolt, and the bolt is threadedly connected to the first connecting ring 46. The upper part of the annular wire mesh 5 is sleeved on the first connecting ring 46 and fixed to the first connecting ring 46 by multiple bolts. In this process, the bolt head and the first connecting ring 46 form a clamping structure and clamp and fix the annular wire mesh 5.
[0040] The ring-shaped wire mesh 5 is formed by surrounding wire mesh sheets with a mesh density of 3 mm × 3 mm, and is welded and fixed at the joint of the enclosure;
[0041] The spacer unit 6 is an important component for connecting two adjacent layers of annular wire mesh 5, and also an important part of preventing longhorn beetles from escaping. The first cross bar inside the spacer unit 6 serves as a skeleton for installing nylon ropes 64. The nylon ropes 64 are arranged diagonally, and the distance between two adjacent nylon ropes 64 does not exceed 5mm. Because the nylon ropes themselves have a certain degree of elasticity, when the longhorn beetle tends to crawl downwards, the distance between the nylon ropes 64 will increase under the intervention of the beetle's legs and body to facilitate the longhorn beetle's passage. When the longhorn beetle passes through the spacer unit 6 and falls into the area of the lower layer of annular wire mesh 5, the nylon rope 64 located above will return to its original state. Even if the longhorn beetle spreads its wings and flies, it will not be able to pass through the spacer unit 6 and escape from the annular wire mesh 5 it is in. The second connecting ring 65 in the spacer unit 6 is a structure used to connect the upper and lower layers of annular wire mesh 5. Its connection method is the same as that of the first connecting ring 46, which will not be described in detail here.
[0042] The bottom partition unit 7 is located at the bottom of the multi-layer mesh cover. It seals the bottom of the multi-layer mesh cover with multiple bottom wire mesh sheets 74. The arrangement of the bottom partition unit 7 is similar to that of the partition unit 6. The bottom partition unit 7 uses the second cross rod as a skeleton to fix the bottom wire mesh sheets 74. The bottom wire mesh sheets 74 are cut from wire mesh sheets with a mesh density of 3 mm × 3 mm. The third connecting ring 75 at the top of the bottom partition unit 7 is used to connect the bottommost annular wire mesh 5 of the multi-layer mesh cover. Its connection method is the same as that of the first connecting ring 46, which will not be described in detail. The fourth connecting ring 76 at the bottom of the bottom partition unit 7 is a component used to connect the induction chamber 8. In this embodiment, the two are connected by a threaded connection.
[0043] The top of the induction chamber 81 is open, and its inner wall is machined with an internal thread for engaging with the external thread on the outer wall of the No. 4 connecting ring 76. An induction cylinder, including a cylinder body 84 and a cylinder cover 85, is located at the bottom center of the chamber body 81. The bottom of the cylinder body 84 is mounted on a fixing seat 83 for fixation. The side wall of the cylinder body 84 is hollowed out to allow the odor of the inducing agent placed inside to evaporate and diffuse. The cylinder cover 85 is fastened to the top of the cylinder body 84. A hook for hanging a secondary inducing agent is located at the bottom center of the cylinder cover 85. The concentration of the inducing agent used in the secondary induction is greater than that used in the primary induction, so that the secondary induction has a more obvious effect on longhorn beetles.
[0044] Specific Implementation Method Two: Combining Figure 4 This embodiment differs from Specific Embodiment 1 in that the bottom of the central circular piece 42 is detachably connected in the vertical direction to a central support shaft 45 for assisting in fixing the multi-layered mesh cover. Other components and connections are the same as in Specific Embodiment 1.
[0045] In this embodiment, the purpose of the central support shaft 45 is to make the structure of the multi-layer mesh cover more stable during operation. Without the central support shaft 45, the longitudinal connection in the multi-layer mesh cover is achieved by the annular wire mesh 5. Although the annular wire mesh 5 has a certain strength, its overall strength weakens as the number of layers increases, making the multi-layer mesh cover prone to deformation during operation, thus affecting its service life. With the addition of the central support shaft 45, the central support shaft 45 is inserted into multiple No. 1 and No. 2 cross rods to form a central support, thus distributing the force on the annular wire mesh 5, ensuring the stability of the annular wire mesh 5 during operation, and preventing deformation, thereby ensuring the service life of the multi-layer mesh cover. The top of the central support shaft 45 is machined with external threads, and the bottom of the central disc 42 is machined with a matching threaded hole. The central support shaft 45 and the central disc 42 are fixed together by a threaded connection.
[0046] Specific implementation method three: Combining Figure 5 and Figure 8 This embodiment differs from Specific Embodiment 1 in that the first cross bar and its constituent structures are identical to those of the second cross bar. Other components and connection methods are the same as in Specific Embodiment 1.
[0047] In this embodiment, the first cross bar includes a first center block 62 and four first support rods 63. The four first support rods 63 are equidistantly distributed circumferentially between the first center block 62 and the spacer ring 61, and the two ends of the first support rods 63 are fixedly connected to the first center block 62 and the spacer ring 61, respectively. The spacer ring 61 is divided into four regions equally by the four first support rods 63. The second cross bar includes a second center block 72 and four second support rods 73. The four second support rods 73 are equidistantly distributed circumferentially between the second center block 72 and the spacer ring 71, and the two ends of the second support rods 73 are fixedly connected to the second center block 72 and the spacer ring 71, respectively. The spacer ring 71 is divided into four regions equally by the four second support rods 73. If used in conjunction with the central support shaft 45 in the third embodiment, two circular holes need to be machined in the first center block 62 and the second center block 72 for fitting onto the central support shaft 45. The fitting can be fixed by hot melt adhesive.
[0048] Specific implementation method four: Combination Figure 14 This embodiment differs from specific embodiment one in that at least one trapping light source 82 is also installed at the inner bottom of the induction chamber 8, a battery for powering the trapping light source 82 is embedded inside the fixing base 83, and the control switch for the trapping light source 82 is integrated on the outer wall of the induction chamber 8. Other components and connections are the same as in specific embodiment one.
[0049] In this embodiment, the addition of the trapping light source 82 is to induce the longhorn beetle by utilizing its phototaxis, thereby increasing the likelihood of the longhorn beetle moving towards the bottom of the multi-layered net.
[0050] The present invention has been disclosed above with reference to preferred embodiments, but it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed structure and technical content to create equivalent embodiments without departing from the scope of the present invention. However, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.
[0051] Working principle
[0052] The multi-layered poplar longhorn beetle trapping net provided in this application is first assembled according to the connection relationships described in Specific Embodiments 1 to 4. Workers hang the assembled multi-layered poplar longhorn beetle trapping net on poplar branches. When the trapping net is in operation, the attractant in the folded cross plate 3 induces the longhorn beetles to fly towards the area of the trapping net and land on the folded cross plate 3. Because the surface of the folded cross plate 3 is coated to prevent the longhorn beetles from climbing, the induced longhorn beetles slide vertically down the folded cross plate 3 into the multi-layered net. At this time, the attractant in the induction chamber induces the longhorn beetles again, causing them to climb towards the bottom layer of the multi-layered net. Once the longhorn beetles successfully enter the area of the second layer of annular wire mesh 5 in the multi-layered net, the trapping net is complete. This indicates that the longhorn beetle has been successfully captured. Due to the height of the folded cross plate 3, and the fact that the attractant is usually attached to the upper part of the folded cross plate 3, many longhorn beetles lack adhesion after hitting the folded cross plate 3 and will fall directly into the multi-layered net. Since the nylon rope 64 itself has a certain degree of elasticity, during the process of the longhorn beetle falling, there is a probability that it will directly pass through the area of the uppermost ring wire mesh 5 and the uppermost spacer unit 6 and fall directly into the area of the second ring wire mesh 5. When the staff collects the captured longhorn beetles, they can directly remove the bottom fixing ring 4, the bottom spacer unit 7 and the multi-layered net between them, and replace them with new bottom fixing ring 4, bottom spacer unit 7 and multi-layered net. After removal, the multi-layered net containing the longhorn beetles can be transported by the staff to a safe area for longhorn beetle collection.
Claims
1. A multi-layered poplar longhorn beetle trapping net, the longhorn beetle trapping net being hung on the branches of a poplar tree, the longhorn beetle trapping net comprising a top fixing cover (1), the top of the top fixing cover (1) being detachably connected to a hook (2) for hanging on the poplar tree branches, and the bottom of the top fixing cover (1) being detachably connected to a folding cross plate (3), and the folding cross plate (3) being provided with a hook for hanging an attractant; characterized in that: A multi-layered mesh cover is provided below the folded cross plate (3). The top of the multi-layered mesh cover is detachably connected to the bottom of the folded cross plate (3) via a bottom fixing ring (4). The bottom of the multi-layered mesh cover is detachably connected to an induction chamber (8) for secondary induction of longhorn beetles. The longhorn beetles are induced a second time through the induction chamber (8), causing the longhorn beetles to move layer by layer to the bottom of the multi-layered mesh cover.
2. The multi-layered poplar longhorn beetle trapping net according to claim 1, characterized in that: The bottom fixing ring (4) includes a fixing ring body (41), and a connecting cross for disassembly connection with the folding cross plate (3) is fixed inside the fixing ring body (41). A first connecting ring (46) for disassembly connection with the multi-layer mesh cover is fixed at the bottom of the fixing ring body (41).
3. A multi-layered poplar longhorn beetle trapping net according to claim 2, characterized in that: The connecting cross includes a central disc (42), and four support beams (43) are provided equidistantly along the circumference between the central disc (42) and the fixing ring body (41) for supporting the folding cross plate (3). Each support beam (43) has a slot (44) at its top that is inserted into one side of the folding cross plate (3).
4. A multi-layered poplar longhorn beetle trapping net according to claim 3, characterized in that: The bottom of the central disc (42) is detachably connected to a central support shaft (45) for assisting in fixing the multi-layer mesh cover in the vertical direction.
5. A multi-layered poplar longhorn beetle trapping net according to claim 4, characterized in that: The multi-layer mesh includes N ring-shaped wire meshes (5) arranged vertically, where N is a positive integer greater than 2. Adjacent ring-shaped wire meshes (5) are connected by a spacer unit (6). The uppermost ring-shaped wire mesh (5) is detachably connected to the first connecting ring (46), and the lowermost ring-shaped wire mesh (5) is detachably connected to the induction chamber (8) through the bottom partition unit (7).
6. A multi-layered poplar longhorn beetle trapping net according to claim 5, characterized in that: The spacer unit (6) includes a spacer ring (61). A cross bar is fixed inside the spacer ring (61). The cross bar divides the interior of the spacer ring (61) into four regions. In each region, multiple diagonally pulled nylon ropes (64) are arranged equidistantly from the center of the spacer ring (61) to the edge of the spacer ring (61). Both ends of each nylon rope (64) are fixedly connected to the cross bar. A second connecting ring (65) for disassembly and connection with the annular wire mesh (5) is coaxially fixed at the upper and lower ends of the spacer ring (61).
7. A multi-layered poplar longhorn beetle trapping net according to claim 6, characterized in that: The bottom partition unit (7) includes a partition ring (71). A second cross bar is fixed inside the partition ring (71). The second cross bar divides the interior of the partition ring (71) into four areas. Each area has a bottom wire mesh (74). The bottom wire mesh (74) is fixedly connected to the second cross bar and the inner wall of the partition ring (71). A third connecting ring (75) is coaxially fixed to the top of the partition ring (71) for detachable connection with the annular wire mesh (5). A fourth connecting ring (76) is coaxially fixed to the bottom of the partition ring (71) for detachable connection with the induction chamber (8).
8. A multi-layered poplar longhorn beetle trapping net according to claim 6, characterized in that: The No. 1 cross bar and its components are the same as those of the No. 2 cross bar.
9. A multi-layered poplar longhorn beetle trapping net according to claim 8, characterized in that: The induction chamber (8) includes a chamber body (81). The top of the chamber body (81) is designed to be open for detachable connection with the fourth connecting ring (76). A fixing seat (83) is installed at the bottom of the chamber body (81). An induction tube for placing the induction agent used for secondary induction is detachably connected to the fixing seat (83).
10. A multi-layered poplar longhorn beetle trapping net according to claim 8, characterized in that: At least one trapping light source (82) is installed at the bottom of the induction chamber (8). A battery for powering the trapping light source (82) is embedded inside the mounting base (83). The control switch of the trapping light source (82) is integrated on the outer wall of the induction chamber (8).