Forest termite killing method

Abstract

The invention relates to the technical field of termite prevention and control, in particular to a forest termite killing method, trees with termite activity traces are treated with a liquid agent, and the liquid agent is a fipronil agent or an imidacloprid agent; when the activity traces of the termites are only located at the lower parts of the trees, fipronil chemicals are selected to treat the trees; when termite activity traces exist on the upper portions of the trees, imidacloprid pesticide is selected to treat the trees. The problems that the control effect is poor, the harm recurrence rate is high and the termite killing cost is increased due to the fact that other control methods cannot effectively kill termites hidden in tree bodies and tree bases can be solved. Meanwhile, the problems that the environment is polluted by chemicals and non-target organisms are damaged are solved by adopting a directional treatment and anti-drifting technology.

Description

Technical Field

[0001] The invention relates to the technical field of termite control, and in particular to a method for exterminating forest termites. Background Art

[0002] Termites, whether soil-dwelling termites such as black-winged soil termites, yellow-winged macrotermites, etc., or amphibious termites such as black-breasted loose termites, yellow-breasted loose termites, etc., often nest in the soil under trees in forest areas, or at the bottom of tree bases, at the bifurcation of branches on the trunk and upper part of trees, or in the soil layer in the middle wrapped by tree roots. From the perspective of preventing water from immersing the nests and termites from feeding, termites choose this area to build nests, which is beneficial to their survival and reproduction. However, when these locations are used for termite control, it is difficult to achieve effective termite control without harming the trees because these locations are closely related to the trees. For example, by opening windows and digging holes on the tree body to take nests, the mechanical damage of opening windows and digging holes will also cause damage to the tree body itself, the tree body's supporting force will decrease, there are safety hazards, and the operation is difficult and costly. Therefore, termite control is usually carried out by applying pesticides. Common forest termite control methods include liquid spraying, powder spraying, bait trapping, ant road injection, etc.

[0003] The liquid spray method is usually applied at the site of termites. Its purpose is to prevent termites from climbing trees to cause harm. The liquid is prepared with bifenthrin and imidacloprid, and sprayed around the tree and the part below 2 meters of the trunk with a sprayer. The amount of liquid for each tree is 0.5-1L / tree. The liquid spray method is simple to operate, but the recurrence rate is high, and multiple treatments are required, which increases the cost of application. Judging from the selection of the agent, the dosage requirements, and the control results introduced, this is only a termite prevention measure, and it cannot effectively eliminate the entire nest.

[0004] Powder spraying method: when a certain number of living termites are found, no matter in the ant trails on the tree, mud blankets, flying holes, or monitoring devices, powder can be used for spraying. After the powder adheres to the termites, the termites are prevented and treated through their feeding and licking behaviors. This method requires a sufficient number of living termites, high powder spraying quality, many powder spraying points, and no ant trails should be blocked. The ant trails should be covered in time after the powder spraying. However, after a period of time, the termites will show a certain avoidance behavior to the location of the powder spraying. The termites will avoid the location of the powder spraying and look for undisturbed places to continue their activities, which affects the termite control effect.

[0005] The bait-killing method is usually divided into two types: above-ground and underground. Bait such as 0.5% fluazifop and 0.1% fluazifop are used as agents, and water is added to make a paste. Attention should be paid to cleaning and protection to reduce the impact of pollution on attracting properties. For the above-ground type, select the ant trail where termites are active, cut open the bait bag, place it tightly against the ant trail, and use a black plastic bag to protect it from light. For the underground type, after termites are found entering the monitoring station, bait is placed in the station for the termites to eat. Both methods require regular inspections and the addition of baits when appropriate until the termite colony is eliminated. This method is labor-intensive and time-consuming, and requires regular testing and replenishment of baits. If the amount of baits is insufficient, all previous efforts will be wasted and termites will not be eradicated.

[0006] The method of injecting liquid into the ant path is to use flubendiamide in a 1:40 ratio solution, and inject it into the ant path and ant blanket with a large veterinary syringe to make the ant blanket and ant path quilt penetrate the liquid. This method also requires living termites to contact the agent through the ant path and mud blanket to work.

[0007] However, the existing methods for killing termites in forests have the following problems in practical application:

[0008] 1) After the existing technology applies pesticides to trees, the pesticides mainly stay on the surface of the bark, which can kill termites active on the surface of the bark. However, termites that are hidden and harmful in the trees cannot be effectively killed, and the overall killing effect is significantly reduced, resulting in serious erosion inside the trees, accelerating the withering of the trees, failing to effectively kill termites, and having a high recurrence rate, which increases the cost of termite killing.

[0009] 2) When the existing technology is used to treat termites in a forest area, one method is usually selected to treat termites in the entire area. However, even in the same area, the activities of termites on different trees are very different. The same termite treatment method may have a significant effect on some trees, but the effect on other trees is obviously poor. This results in the failure of effective prevention and control in the entire area, greatly increasing the probability of recurrence.

[0010] 3) During the application process, the pesticide can easily diffuse into the air and drift with the air. When the forest is in a public area of ​​the city with dense population, closed prevention and control construction cannot be carried out when termite control is carried out. The spread of pesticides will directly endanger human health and pollute the soil. When the forest is in a water source protection area, or in the surrounding mountains and forests at both ends of the reservoir dam, or in the reservoir operation and management living area, termite damage is found. When termite control is carried out, the spread of pesticides will harm non-target organisms, pollute soil and water bodies, cause great harm to the environment, and pose a major safety hazard. Summary of the invention

[0011] The present invention provides a method for exterminating forest termites, which can solve the problem that termites hidden in trees cannot be effectively exterminated, resulting in a high recurrence rate of termite damage and increased termite extermination costs.

[0012] This application provides the following technical solutions:

[0013] A method for exterminating forest termites, using a liquid agent to treat trees with traces of termite activity, wherein the liquid agent is fipronil or imidacloprid; when the traces of termite activity are only located at the lower part of the tree, the fipronil agent is selected to treat the tree; when the traces of termite activity are present at the upper part of the tree, the imidacloprid agent is selected to treat the tree.

[0014] Beneficial effects: Signs of termite activity include the presence of living termites, mud roads, mud blankets, flight holes, and moths on trees, or termite flight holes, mud roads, mud blankets, and other traces around the tree base, or termite activity and damage on supporting wooden poles, etc. The overt manifestations of termite damage and activity on trees are staged. In late spring and early summer, the winged reproductive ants of mature termite populations will build flight holes to expand the colony and fly away, and they may also go out to feed in autumn. In other seasons, termites will hide in ant nests or trees for most of the time due to high temperatures or low temperatures. In some years, due to the different development processes of the termites themselves, they do not go out every year. When termites hide in tree trunks and under tree roots to cause damage but do not go out, the effectiveness of existing technologies in killing termites is significantly reduced. This has been a problem that has plagued technicians and needs to be solved urgently.

[0015] It has been found through experiments that fipronil has a certain permeability, can penetrate the bark and enter the phloem of trees, and with the help of the sieve tubes of the phloem, it is transported and diffused from top to bottom to the lower part of the tree along with the transportation of organic matter, acting on the area of ​​termite activity at the lower part of the tree. However, even if fipronil enters the xylem of the tree by osmosis, it is impossible to transport the water and inorganic salts along with the duct of the xylem, that is, it is difficult to make fipronil transport and diffuse from bottom to top to the upper part of the tree. Therefore, when there are traces of termite activity in the upper part of the tree (including the branches at the top of the tree), only fipronil is used to treat the tree, and it is necessary to apply the medicine from the top of the tree or increase the amount of liquid medicine applied. The higher the tree, the greater the difficulty of applying the medicine at the top of the tree. During the application of the medicine, the agent is easily dispersed into the air, and the amount of liquid medicine applied increases the cost of the agent and the construction cost, and it is also easy to cause environmental pollution. And imidacloprid has systemic absorption. When the agent reaches the xylem, it will be transported and diffused from bottom to top in the tree duct along with the transportation of water and inorganic salts, directly acting on the area of ​​termite activity at the upper part of the tree.

[0016] This technical solution determines the activity area of ​​termites on trees according to the distribution of termite activity traces on trees, selects corresponding agents for treatment, and allows the agents to enter trees through the systemic conductivity and permeability of the agents, and combines with the tree's own conduction system (phloem, xylem) to fully diffuse the agents in the trees and directly act on the areas where termites are active, thereby improving the utilization rate of the efficacy and the effect of killing termites in the entire area. Whether it is the passive contact of termites in the ant tunnels of the tree body, or the active feeding of termites on trees, the stomach poisoning and contact killing effects of the agents will have the effect of killing termites. The cost of imidacloprid is lower than that of fipronil, and the combination of the two can effectively reduce the total cost of the agents. At the same time, it can also protect the important parts of the trees (such as bark, phloem and xylem), ensuring that they continue to play their respective functions and support the healthy growth of trees.

[0017] Furthermore, the fipronil adopts 25 g / L emulsifiable concentrate, and the preparation ratio of fipronil to water is 1:140-170.

[0018] Beneficial effects: The formulated fipronil agent can effectively act as a stomach poison and contact killer on termites, and utilizes the feeding behavior of termites to make them bring trees soaked in the agent back to their nests through active foraging behavior, infecting more termites and achieving the effect of destroying the entire nest.

[0019] Furthermore, the imidacloprid adopts a 10% suspension, and the preparation ratio of imidacloprid to water is 1:60-120.

[0020] Beneficial effects: The formulated imidacloprid agent can effectively act as a stomach poison and contact killer on termites, and utilizes the feeding behavior of termites to make them bring trees soaked in the agent back to their nests through active foraging behavior, infecting more termites and ensuring the termite control effect.

[0021] Furthermore, the amount of liquid medicine for applying the liquid agent is as follows: when the diameter of the tree is below 20CM, the amount of liquid medicine is 1.5-2L / tree; when the diameter of the tree is 20-30CM, the amount of liquid medicine is 3-4L / tree; when the diameter of the tree is 30-50CM, the amount of liquid medicine is 5-6L / tree; when the diameter of the tree is above 50CM, the amount of liquid medicine is 8-10L / tree.

[0022] Furthermore, when using liquid medicine to treat trees, the medicine is applied starting from the branch fork at the top of the trunk, and applied vertically from top to bottom until the trunk is soaked with the liquid medicine and the medicine enters the tree.

[0023] Beneficial effect: thus ensuring that the medicine can fully exert its efficacy and ensure the effect of killing termites.

[0024] Furthermore, the liquid agent is prepared by secondary dilution, in which the agent is completely dispersed and dissolved in a room far away from the work site to complete the first agent dilution; the first diluted agent is moved to the work site to complete the second agent dilution.

[0025] Beneficial effects: In an indoor environment, the temperature and stirring conditions can be better controlled to ensure that the agent is completely dissolved, improve the solubility of the agent, reduce the leakage and pollution of the agent at the work site, and improve environmental safety. The first diluted agent has a relatively high concentration and a small volume, which is convenient for storage and transportation. The loss of the agent is reduced during transportation, the utilization rate of the agent is improved, the operation steps at the work site can be reduced, and the risk of operators contacting the original agent is reduced.

[0026] Furthermore, when a liquid agent is used to treat trees, the liquid agent spreads out in a fan shape to soak the tree trunks, and does not generate droplets suspended in the air.

[0027] Beneficial effects: Precision pesticide application is achieved, pesticide drift is avoided during application, pesticide utilization is improved, environmental pollution is reduced, the health of operators and surrounding personnel is protected, and pollution of the surrounding environment is avoided. It can be used on trees in public areas to protect the soil and reduce damage to non-target organisms.

[0028] Furthermore, before the trees are treated with liquid agents, they are in a dry state, that is, the water content of the trees meets the normal growth of the trees. They are not in a humid state where the water content of the trees increases after rain, nor are they in a dry and water-deficient state where the water content of the trees decreases due to high temperature climate.

[0029] Beneficial effects: Ensure that trees can fully absorb the pesticide, ensure the concentration of the pesticide solution, and give full play to the effect of the pesticide.

[0030] Furthermore, when liquid medicine is used to treat trees, a pesticide application device is used to apply the medicine to the trees. The pesticide application device includes an adjustable-speed electric sprayer. The discharge end of the adjustable-speed electric sprayer is connected to a retractable and extended spray rod. A windproof and drift-proof directional nozzle is provided on the top of the retractable and extended spray rod. A windproof cover is provided on the outside of the windproof and drift-proof directional nozzle.

[0031] Beneficial effects: By reducing the spray pressure of the adjustable speed electric sprayer, the pesticide is prevented from forming droplets that can be suspended in the air; combined with the windproof and drift-proof fan-shaped directional nozzle, the pesticide is fan-shaped and sprayed vertically to the tree trunk, achieving precise pesticide application, avoiding the drift of the pesticide, and improving the utilization rate of the pesticide; a windproof cover is set on the nozzle to further reduce the impact of external factors (such as wind) on the pesticide, and prevent the pesticide from drifting in the surrounding environment such as the air and soil. Trees are usually tall, and lengthening the spray rod facilitates the application of pesticides to tall trees and improves work efficiency. The directional treatment and anti-drift technology adopted in this technical solution solves the problem of pesticide pollution of the environment and damage to non-target organisms.

[0032] Furthermore, when the pesticide application device is used to apply pesticides to trees, the wind-proof and drift-proof directional nozzle is vertically opposite to the tree trunk, and the distance between the nozzle and the tree trunk is 10-15 cm.

[0033] Beneficial effects: The nozzle is perpendicular to the tree trunk, which can ensure that the agent is sprayed accurately to the target location and improve the accuracy of spraying. The distance between the nozzle and the tree trunk is kept at 10-15cm, which can ensure that the agent is sprayed within the optimal distance range and avoid the agent from spreading and polluting the environment. DETAILED DESCRIPTION

[0034] The following is further described in detail through specific implementation methods:

[0035] Embodiment 1

[0036] A method for killing forest termites comprises the following steps:

[0037] 1) Observe the trees.

[0038] Observe the condition of each tree in the forest area and observe whether there are any signs of termite activity on the trees, such as living termites, mud roads, mud blankets, termite holes, and borers, or termite holes, mud roads, or supporting poles around the tree base with signs of termite activity. At the same time, if no prevention and control measures have been taken in the past three years or the prevention and control methods are incorrect or unscientific, it can be considered that there are signs of termite activity and damage, and termite extermination is required.

[0039] Observe the distribution of termite activity traces on trees, including termite activity traces in the lower part of trees and termite activity traces in the upper part of trees. The lower part of trees includes the lower part of the trunk, the bottom of the trunk, and the roots of the tree; the upper part of trees includes the upper part of the trunk, the top of the trunk, and the branches. In particular, termite flight holes are found in the upper part of the trunk, or there is a lot of mud at the branch forks.

[0040] During the observation, statistical records are kept of termite activities and distribution of signs of damage on trees, tree diameters, and the number of trees.

[0041] 2) Drug selection.

[0042] Use liquid agents to treat trees with traces of termite activity. The liquid agents used are fipronil or imidacloprid. When the traces of termite activity are only located in the lower part of the tree and no traces are found in the upper part of the tree, fipronil is selected as the agent for killing termites to treat the tree. Fipronil has a certain degree of permeability and can penetrate the bark and, with the help of the sieve tubes of the phloem, be transported and diffused from top to bottom to the lower part along with the transportation of organic matter.

[0043] When there are signs of termite activity on the upper part of the tree, especially when termite holes are found on the upper part of the trunk, or there is a lot of mud on the branch forks, choose imidacloprid as the agent to kill termites and treat the tree. Imidacloprid is systemic. When the agent reaches the wood, it will be transported from bottom to top in the tree's tube along with the transportation of water and inorganic salts.

[0044] 3) Preparation of liquid medicines.

[0045] The fipronil agent is prepared with 25 g / L emulsifiable concentrate of fipronil, and the ratio of fipronil to water is 1:140-170. The imidacloprid agent is prepared with 10% suspension of imidacloprid, and the ratio of imidacloprid to water is 1:60-120.

[0046] The liquid amount of the liquid used for treating trees is determined according to the tree diameter and the concentration of the liquid, and is based on the fact that the liquid can enter the designated position inside the tree. The liquid amount of the liquid used for treating trees is as follows: when the tree diameter is less than 20CM, the liquid amount is 1.5-2L / tree; when the tree diameter is 20-30CM, the liquid amount is 3-4L / tree; when the tree diameter is 30-50CM, the liquid amount is 5-6L / tree; when the tree diameter is more than 50CM, the liquid amount is 8-10L / tree.

[0047] Liquid agents are prepared by secondary dilution. Place the agent in a 500-1000ml container in a room far away from the work site, add water, and mix evenly until the agent is completely dispersed and dissolved, completing the first agent dilution. Move the first diluted agent to the work site, inject the first diluted agent according to the capacity of the actual application equipment, and then add water to fill it up to complete the second agent dilution.

[0048] 4) Use liquid agents to treat trees.

[0049] 4-1) Preparation before application: Trees are treated with pesticides, usually in spring (April to June) and autumn (October to November). In spring and autumn, the climate is warm, the sun is abundant, and the rainfall is moderate, which greatly promotes the growth of trees. The metabolism of trees is most active, which helps the pesticide to spread in the trees. At the same time, this season is also a period of frequent termite activity, which can ensure that termites are in full contact and feeding with the pesticide, effectively improving the effect of termite control. Before the trees are treated with pesticides, the trees are in a dry state, that is, the water content of the trees meets the normal growth of the trees. It is not a humid state where the water content of the trees increases after rain, nor is it a dry and water-deficient state where the water content of the trees decreases due to high temperature. The dry state of the tree can be judged manually, such as by touching the bark with your hand, and there is no obvious sense of moisture. If it rains in the area to be sprayed, wait 1-3 days after the rain to ensure that the trees are dry enough to meet the requirements of the operation, and avoid high humidity in the trees, which will reduce the absorption of the solution by the trees, and then reduce the concentration of the solution, which will not play an effective role in killing the pests. The wind speed on the day of spraying should be below level 3 to prevent the wind from affecting the operation.

[0050] 4-2) Application device: The application device includes an adjustable speed electric sprayer, a windproof and driftproof directional nozzle, a windshield, and a retractable and extended spray rod. The adjustable speed electric sprayer includes a liquid storage barrel, a covered loading port is provided on the top of the liquid storage barrel, and the bottom of the liquid storage barrel is connected to the feed end of the discharge pipe through an adjustable speed electric pump, and the electric pump is electrically connected to the battery box. The discharge end of the discharge pipe is detachably connected to the feed end of the retractable and extended spray rod, and can be detachably connected by bolts or threads. A windproof and driftproof directional nozzle is provided at the top of the retractable and extended spray rod, and a windshield is provided on the outside of the windproof and driftproof directional nozzle. The windproof and driftproof directional nozzle can adopt the Licheng FVP windproof nozzle, which forms a fan-shaped thin mist. The windshield can effectively prevent the atomized liquid from splashing. Operators who apply pesticides will receive operational training, and can only carry out pesticide application operations after passing the assessment, to ensure standardized pesticide application and prevent pesticide drift, pollution of the surrounding environment, and impact on the ecosystem.

[0051] 4-3) Apply pesticides to trees: Start applying pesticides from the bifurcation of branches at the top of the trunk (i.e. the main trunk of the tree), apply pesticides vertically from top to bottom, rotate and move along the trunk, and then apply pesticides vertically from top to bottom, and repeat this process until the trunk is soaked with pesticides. The windproof and drift-proof directional nozzle is perpendicular to the trunk, and the distance between the nozzle and the trunk is 10-15cm. By controlling the electric pump, the pesticide sprayed from the nozzle is fan-shaped and sprayed onto the trunk to soak the trunk, without generating droplets suspended in the air, so as to prevent the pesticide from spreading into the air to pollute the surrounding environment and endanger the safety of the operators.

[0052] Experimental Example 1

[0053] In spring (June 2020), multiple experimental areas and comparison areas were set up. Each experimental area and comparison area was located on a different street and was far apart to avoid affecting each other. There were obvious signs of termite activity and damage on the trees in each experimental area and comparison area. The method and device of Example 1 were used to apply pesticides to the trees in experimental areas 1-4. According to the distribution of termite activity and signs of damage on the trees, the corresponding agent (fipronil or imidacloprid) was selected for application. After the application of the pesticide, the tree was hung as an identification mark, and continued to follow up and observe (follow up for 3-5 years). The method and device of Example 1 were used to apply pesticides to the trees in comparison area 1, with the difference that only fipronil was used to apply pesticides to trees with signs of termite activity and damage. The experimental statistical data of each experimental area and comparison area are shown in Table 1 below.

[0054] Table 1

[0055]

[0056]

[0057] Note: Insect strains refer to trees with termite activity and signs of damage. Newly added strains refer to the discovery of termite activity and signs of damage on trees that have not been treated with pesticides. Recurrence refers to the discovery of new termite activity and signs of damage on trees that have been treated with pesticides. After observing and discovering new or recurrent insect strains, pesticides will be applied to the insect strains in a timely manner.

[0058] As shown in Table 1, there were 37 new insect strains in experimental area 1 in the year of application (i.e. October 2020), but no new or recurrent insect strains were found when the observation was carried out in May 2023. After 3 years of continuous observation, no new or recurrent insect strains were found in experimental area 2. There were 3 and 2 new insect strains in experimental area 3 in the year of application and the following year (July 2021), respectively, but no new or recurrent insect strains were found subsequently. There were 3 new insect strains in experimental area 4 in the year after application and 1 new strain in May 2023, but compared with the control area 1, there were 30 new insect strains in the year of application, 34 new insect strains in the following year, and 17 new insect strains in May 2023. The termite control effect of this technology is more significant. Moreover, compared with the control area 1, no recurrent insect strains were found in each experimental area.

[0059] When the preparation ratio of the fipronil agent is greater than or less than 1:140-170, or the preparation ratio of the imidacloprid agent is greater than or less than 1:60-120, the recurrence rate of the trees in the entire area increases significantly. This is because the concentration of the agent is too large and the toxicity is high. A large number of termites die in a short period of time on a single tree. Termites show behaviors of avoiding danger. Termites will look for relatively safe trees to feed, resulting in an increase in the total number of insect strains. When the concentration of the agent is too low, its toxicity cannot achieve the effect of killing termites. Only within the scope of this technical solution can the agent play an effective stomach poison effect and contact killing effect, and use the feeding behavior of termites to make termites bring the trees soaked with the agent back to the nest through active foraging behavior, infect more termites, and achieve the effect of killing the entire nest. Moreover, through the systemic conductivity and permeability of the agent, the agent is diffused in the trees, so that the agent directly acts on the termites hidden in the tree body and the tree base, and the killing effect is improved; and the probability of contact between the agent and the termites is effectively increased, so that the termites are prompted to actively feed on the trees soaked with the agent, and the killing effect of termites is further improved, and the recurrence rate is reduced. Combined with the application device for application, directional application can be achieved, and the prevention and control agent is scattered in the surrounding environment such as air and soil, avoiding damage to non-target organisms and protecting ecological health. In addition, the inventor has found through experiments that the killing effect of imidacloprid agent on termites is slightly lower than that of fipronil agent. If the present technical solution is not adopted and the imidacloprid agent is used alone to kill and treat, the recurrence rate of termites is still high.

[0060] The above are only embodiments of the present invention. The invention is not limited to the field involved in this implementation case. The common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A method for killing forest termites, characterized in that: Treating trees with traces of termite activity with a liquid agent, wherein the liquid agent is fipronil or imidacloprid; when the traces of termite activity are only located at the lower part of the tree, the fipronil agent is selected to treat the tree; When there are signs of termite activity on the upper part of the tree, choose imidacloprid to treat the tree.

2. A method for killing forest termites according to claim 1, characterized in that: The fipronil adopts 25 g / L emulsifiable concentrate, and the preparation ratio of fipronil to water is 1:140-170.

3. A method for killing forest termites according to claim 1, characterized in that: The imidacloprid adopts a 10% suspension, and the preparation ratio of imidacloprid to water is 1:60-120.

4. A method for killing forest termites according to claim 1, characterized in that: The amount of liquid medicine for applying the liquid agent is as follows: when the diameter of the tree is below 20CM, the amount of liquid medicine is 1.5-2L / tree; when the diameter of the tree is 20-30CM, the amount of liquid medicine is 3-4L / tree; when the diameter of the tree is 30-50CM, the amount of liquid medicine is 5-6L / tree; when the diameter of the tree is above 50CM, the amount of liquid medicine is 8-10L / tree.

5. A method for killing forest termites according to claim 1, characterized in that: The liquid agent is prepared by secondary dilution, in which the agent is completely dispersed and dissolved in a room far away from the work site to complete the first agent dilution; the first diluted agent is moved to the work site to complete the second agent dilution.

6. A method for killing forest termites according to claim 1, characterized in that: When using liquid agents to treat trees, start applying the agent from the top of the trunk where the branches fork, and apply the agent vertically from top to bottom until the trunk is soaked with the liquid agent.

7. A method for killing forest termites according to claim 1, characterized in that: When a liquid agent is used to treat trees, the liquid agent spreads out in a fan shape to soak the tree trunk without producing droplets suspended in the air.

8. A method for killing forest termites according to claim 1, characterized in that: The trees are in a dry state before being treated with liquid agents.

9. A method for killing forest termites according to claim 1, characterized in that: When liquid medicine is used to treat trees, a pesticide application device is used to apply the medicine to the trees. The pesticide application device includes an adjustable-speed electric sprayer. The discharge end of the adjustable-speed electric sprayer is connected to a telescopic and extended spray rod. A windproof and anti-drift directional nozzle is arranged on the top of the telescopic and extended spray rod. A windproof cover is arranged on the outside of the windproof and anti-drift directional nozzle.

10. A method for exterminating forest termites according to claim 9, characterized in that: When the pesticide application device is used to apply pesticides to trees, the wind-proof and drift-proof directional nozzle is vertically opposite to the tree trunk, and the distance between the nozzle and the tree trunk is 10-15 cm.

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