A special fumigant for preventing and controlling red fire ants and its preparation method and application

Abstract

The present invention discloses a special fumigant for preventing and controlling red fire ants, and a preparation method and application thereof. The fumigant contains 2% to 6% pyrethrin, 2% to 15% frangipani extract, Tween and ethanol. The present invention can more efficiently repel and kill red fire ants (including effective destruction of eggs) through the synergistic effect of multiple effective ingredients, greatly reducing the population of red fire ants. The selected ingredients are relatively low-toxic, have less harm to the environment and non-target organisms, and help maintain ecological balance. The fumigant of the present invention has higher efficiency, reduces the amount of medicine used and the number of times the medicine is applied, and reduces the cost of prevention and control.

Description

Technical Field

[0001] The invention belongs to the technical field of biological control, and specifically relates to a special fumigant for controlling red imported fire ants and a preparation method and application thereof. Background Art

[0002] Fire ant ( Solenopsis invicta Buren ) is an invasive ant species that has caused significant damage to agriculture, horticulture and the environment. Current control methods include biological control, physical methods and chemical control, but biological control requires the introduction of natural enemies or pathogens for control, which usually takes a long time to show results, is costly, and may have different effects under different environmental and ecological conditions. In addition, when natural enemies or pathogens are introduced, there may be an impact on the ecosystem. Physical control mainly involves watering ant nests with hot water. The operation is simple, but it only treats the symptoms and not the root cause. Red fire ants can quickly rebuild their nests, and it may also cause damage to surface vegetation. Although chemical control is quick to take effect, it is often more toxic and may cause harm to non-target organisms and the environment. Long-term use will also cause red fire ants to develop drug resistance.

[0003] The invention patent application with application number 202110198570.6 discloses a method for preventing and controlling red fire ants. It attempts to use ethanol-water solution infusion combined with plastic mulch fumigation, which has a certain toxic effect on red fire ants. However, its high dosage of agents (about 10L per ant nest) and long processing time (more than 24 hours) lead to low efficiency, making it difficult to meet the needs of large-scale and rapid prevention and control, limiting its practical application.

[0004] Therefore, it is urgent to develop an efficient, environmentally friendly, economical and easy-to-operate red fire ant control technology to address the shortcomings of existing technologies. Future research should focus on reducing the amount of pesticides used, shortening the treatment time, and exploring more environmentally friendly and targeted control strategies. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a special fumigant for preventing and controlling red fire ants and a preparation method and application thereof.

[0006] The technical solution of the present invention is as follows:

[0007] A special fumigant for preventing and controlling red fire ants, comprising the following ingredients by mass percentage: 2% to 6% pyrethrin, 2% to 15% frangipani extract, Tween, and ethanol;

[0008] The plumeria extract is: plumeria (scientific name Plumeria rubra L. cv. Acutifolia The petals of Plumeria spp. (a deciduous plant of the genus Plumeria) are crushed, and an organic solvent is added for grinding. The grinding is allowed to stand, and an extract is obtained by filtering; the organic solvent is ethanol or a mixed solvent of ethanol and glycerol.

[0009] Pyrethrin is a natural ingredient from plants that is low in toxicity and environmentally friendly. Compared with traditional highly toxic chemicals, it can greatly reduce the harm to the environment and non-target organisms. The combination of plumeria extract and pyrethrin can improve the control effect. Ethanol, as a common organic solvent, has good solubility and volatility, which helps to improve the diffusion and penetration of the agent. Tween, as an adjuvant, can enhance the stability and uniformity of the agent and improve the control effect.

[0010] Preferably, the frangipani extract is prepared by crushing the frangipani petals, adding an organic solvent at a mass ratio of 1:1-2 for grinding, letting the grinding stand, and filtering to obtain an extract; the organic solvent is ethanol or a mixed solvent of ethanol and glycerol, and the volume ratio of ethanol to glycerol in the mixed solvent of ethanol and glycerol is 7-9:1.

[0011] Preferably, the special fumigant for controlling red fire ants is composed of the following ingredients, calculated by mass percentage: 2% to 6% pyrethrins, 2% to 15% frangipani extract, at least 0.5% Tween, and the remainder is ethanol.

[0012] Preferably, the special fumigant for controlling red fire ants is composed of the following ingredients, calculated by mass percentage: 2% to 6% pyrethrins, 2% to 5% frangipani extract, 0.5% Tween, and the balance is ethanol.

[0013] Preferably, the special fumigant for controlling red fire ants is composed of the following ingredients, calculated by mass percentage: 2% pyrethrins, 2% frangipani extract, 0.5% Tween, and the balance is ethanol.

[0014] The preparation method of the special fumigant for preventing and controlling red fire ants comprises the following steps:

[0015] Step 1: Mix pyrethrin and ethanol evenly;

[0016] Step 2: Add Tween and frangipani extract, mix thoroughly, and obtain a fumigant.

[0017] This preparation method is simple and easy, does not require complicated equipment and processes, and reduces the difficulty and cost of industrial production.

[0018] The present invention further provides application of the fumigant in preventing and controlling red imported fire ants.

[0019] The application comprises the following steps:

[0020] Step 1: Cover the ant nest with a cage to prevent the red fire ants from escaping;

[0021] Step 2: Release the atomized fumigant into the cover and fumigate the entire ant nest for at least 10 minutes.

[0022] Preferably, the fumigant atomizer release rate is 100-150 mL / min, the release time is at least 10 min, and the fumigation temperature is controlled at 35-50°C.

[0023] Preferably, the fumigant atomizer release rate is 100 mL / min, the release time is 10 min, and the fumigation temperature is controlled at 35°C.

[0024] In terms of application, the fumigant of the present invention has good repellent and lethal effects on red fire ants, and a concentration of 2% is sufficient to exert a highly effective insecticidal effect. Compared with the prior art, where each ant nest needs to be infused with a large amount of agents and the treatment time is long, the fumigant of the present invention uses less dosage and has a short treatment time, and can effectively control the number of red fire ants, greatly improving the prevention and control efficiency.

[0025] Beneficial effects of the present invention:

[0026] High efficiency: The present invention has good repellent and lethal effects on red fire ants, and a concentration of 2% is sufficient to show its high insecticidal effect. It can effectively control the number of red fire ants and reduce their impact on the environment.

[0027] Long-term effect: The invention has a long-term poisoning or repelling effect on red fire ants, and no new ant nests are found after 8 weeks of treatment.

[0028] Quick effect: The present invention can completely kill red fire ants after fumigation for 10 minutes.

[0029] Environmental protection: It uses plant-derived substances with low toxicity to humans and highly efficient fumigation methods, which causes less harm to the environment and non-target organisms.

[0030] Easy to operate: The preparation method of the fumigant is simple and easy, which reduces the complexity and cost of industrial production. The application device is reasonably designed and easy to operate, and can be used in a variety of environments (farmland, home and public places).

[0031] Low cost: The fumigant has simple ingredients and is used in small amounts. Its cost is lower than other methods of preventing and controlling red fire ants, which can effectively reduce the cost of prevention and control. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 : Schematic diagram of the structure of a special fumigation device for preventing and controlling red fire ants.

[0033] In the figure: 1 atomizer; 2 controller; 3 fumigant container; 4 fumigant delivery port; 5 support column; 6 release system; 7 cone releaser; 8 release cover. DETAILED DESCRIPTION

[0034] In order to better understand the technical content of the present invention, the present invention is further described below in conjunction with specific embodiments and drawings.

[0035] Example 1

[0036] Preparation of fumigant:

[0037] The fumigant is composed of the following ingredients (mass percentage): 2% pyrethrin, 5% frangipani extract, 0.5% Tween 80 (adjuvant), and the balance is ethanol (carrier).

[0038] The preparation method of the frangipani extract is as follows: the frangipani petals are crushed, and then an ethanol-glycerol mixed solvent (ethanol: glycerol = 9:1, volume ratio) is added in a mass ratio of 1:1 for grinding, and then the mixture is allowed to stand for 24 hours, and an extract is obtained by filtering.

[0039] Preparation method of fumigant:

[0040] Step 1: Mix pyrethrin and carrier evenly.

[0041] Step 2: Add auxiliary agent and frangipani extract, mix thoroughly to obtain fumigant.

[0042] Use the fumigant to control red fire ants:

[0043] Step 1: Cover the ant nest with a cage to prevent red fire ants from escaping.

[0044] Step 2: Release the atomized fumigant from the top of the cover into the cover to fumigate the entire ant nest. The atomized fumigant release rate is 100mL / min, the release time is 10min, and the fumigation temperature is controlled at 35℃.

[0045] Step 3: After 15 minutes, open the cover and there are no active red fire ants on the anthill, and you can see that there are dead ants in the anthill and ant nest.

[0046] Step 4: After three weeks, the number of ant nests and the condition of red fire ants in the nests were observed. There were 15 dead nests and no new ant nests around, with a reduction rate of 100%. There were still no new ant nests after 8 weeks.

[0047] Example 2

[0048] Preparation of fumigant:

[0049] The fumigant is composed of the following ingredients (mass percentage): 2% pyrethrin, 5% frangipani extract, 0.5% Tween 80 (adjuvant), and the balance is ethanol (carrier).

[0050] The preparation method of the frangipani extract is as follows: the frangipani petals are crushed, and then an ethanol-glycerol mixed solvent (ethanol: glycerol = 7:1, volume ratio) is added in a mass ratio of 1:1 for grinding, and then the mixture is allowed to stand for 24 hours after grinding, and an extract is obtained by filtering.

[0051] Preparation method of fumigant:

[0052] Step 1: Mix pyrethrin and carrier evenly.

[0053] Step 2: Add auxiliary agent and frangipani extract, mix thoroughly to obtain fumigant.

[0054] Use the fumigant to control red fire ants:

[0055] Step 1: Cover the ant nest with a cage to prevent red fire ants from escaping.

[0056] Step 2: Release the atomized fumigant from the top of the cover into the cover to fumigate the entire ant nest. The atomized fumigant release rate is 100mL / min, the release time is 10min, and the fumigation temperature is controlled at 35℃.

[0057] Step 3: After 15 minutes, open the cover and there are no active red fire ants on the anthill, and you can see that there are dead ants in the anthill and ant nest.

[0058] Step 4: After three weeks, the number of ant nests and the condition of red fire ants in the nests were observed. There were 15 dead nests and no new ant nests around, with a reduction rate of 100%. There were still no new ant nests after 8 weeks.

[0059] Example 3

[0060] Preparation of fumigant:

[0061] The fumigant is composed of the following ingredients (mass percentage): 2% pyrethrin, 5% frangipani extract, 0.5% Tween 80 (adjuvant), and the balance is ethanol (carrier).

[0062] The preparation method of the frangipani extract is as follows: the frangipani petals are crushed, and then a mixed solvent of ethanol and glycerol (ethanol: glycerol = 9:1, volume ratio) is added in a mass ratio of 1:2 for grinding, and the mixture is allowed to stand for 24 hours after grinding, and the extract is obtained by filtering.

[0063] Preparation method of fumigant:

[0064] Step 1: Mix pyrethrin and carrier evenly.

[0065] Step 2: Add auxiliary agent and frangipani extract, mix thoroughly to obtain fumigant.

[0066] Use the fumigant to control red fire ants:

[0067] Step 1: Cover the ant nest with a cage to prevent red fire ants from escaping.

[0068] Step 2: Release the atomized fumigant from the top of the cover into the cover to fumigate the entire ant nest. The atomized fumigant release rate is 100mL / min, the release time is 10min, and the fumigation temperature is controlled at 35℃.

[0069] Step 3: After 15 minutes, open the cover and there are no active red fire ants on the anthill, and you can see that there are dead ants in the anthill and ant nest.

[0070] Step 4: After three weeks, the number of ant nests and the condition of red fire ants in the nests were observed. There were 15 dead nests and no new ant nests around, with a reduction rate of 100%. There were still no new ant nests after 8 weeks.

[0071] Example 4

[0072] Preparation of fumigant:

[0073] The fumigant is composed of the following ingredients (mass percentage): 2% pyrethrin, 5% frangipani extract, 0.5% Tween 80 (adjuvant), and the balance is ethanol (carrier).

[0074] The preparation method of the frangipani extract is as follows: the frangipani petals are crushed, ethanol is added in a mass ratio of 1:1 for grinding, the mixture is allowed to stand for 24 hours after grinding, and an extract is obtained by filtering.

[0075] Preparation method of fumigant:

[0076] Step 1: Mix pyrethrin and carrier evenly.

[0077] Step 2: Add auxiliary agent and frangipani extract, mix thoroughly to obtain fumigant.

[0078] Use the fumigant to control red fire ants:

[0079] Step 1: Cover the ant nest with a cage to prevent red fire ants from escaping.

[0080] Step 2: Release the atomized fumigant from the top of the cover into the cover to fumigate the entire ant nest. The atomized fumigant release rate is 100mL / min, the release time is 10min, and the fumigation temperature is controlled at 35℃.

[0081] Step 3: After 15 minutes, open the cover and there are no active red fire ants on the anthill, and you can see that there are dead ants in the anthill and ant nest.

[0082] Step 4: After three weeks, the number of ant nests and the condition of the red fire ants in the nests were observed. There were 15 dead nests and no new nests around, with a reduction rate of 100%. After 8 weeks, one new nest was found.

[0083] Comparative Example 1

[0084] Fumigant: Water

[0085] Use the fumigant to control red fire ants:

[0086] Step 1: Cover the ant nest with a cage to prevent red fire ants from escaping.

[0087] Step 2: Release the atomized fumigant from the top of the cover into the cover to fumigate the entire ant nest. The atomized fumigant release rate is 100mL / min, the release time is 10min, and the fumigation temperature is controlled at 35℃.

[0088] Step 3: After 15 minutes, open the release device, there will be dead ants on the anthill and the activity of red fire ants will be obvious.

[0089] Step 4: After three weeks, the number of ant nests and the condition of the red fire ants in the nests were observed. There were two dead nests, with a reduction rate of 13.3%. After eight weeks, two new ant nests were found.

[0090] Comparative Example 2

[0091] Fumigant: Ethanol

[0092] Use the fumigant to control red fire ants:

[0093] Step 1: Cover the ant nest with a cage to prevent red fire ants from escaping.

[0094] Step 2: Release the atomized fumigant from the top of the cover into the cover to fumigate the entire ant nest. The atomized fumigant release rate is 100mL / min, the release time is 10min, and the fumigation temperature is controlled at 35℃.

[0095] Step 3: After 15 minutes, open the release device, and you will see dead ants on the anthill and fleeing red fire ants around it.

[0096] Step 4: After three weeks, the number of ant nests and the condition of the red fire ants in the nests were observed. There were 6 dead nests, with a reduction rate of 40%. After 8 weeks, 5 new ant nests were found.

[0097] Comparative Example 3

[0098] Preparation of fumigant:

[0099] The fumigant consists of the following ingredients (mass percentage): 2% pyrethrin, 97.5% ethanol (carrier), and 0.5% Tween 80 (adjuvant).

[0100] Preparation method of fumigant:

[0101] Step 1: Mix pyrethrin and carrier evenly.

[0102] Step 2: Add auxiliary agent and frangipani extract, mix thoroughly to obtain fumigant.

[0103] Use the fumigant to control red fire ants:

[0104] Step 1: Cover the ant nest with a cage to prevent red fire ants from escaping.

[0105] Step 2: Release the atomized fumigant from the top of the cover into the cover to fumigate the entire ant nest. The atomized fumigant release rate is 100mL / min, the release time is 10min, and the fumigation temperature is controlled at 35℃.

[0106] Step 3: After 15 minutes, open the cover and you will see dead ants on the anthill and fleeing red fire ants around it.

[0107] Step 4: After three weeks, the number of ant nests and the condition of red fire ants in the nests were observed. There were 13 dead nests and no new ant nests around, with a reduction rate of 86.7%. After eight weeks, two new ant nests were found.

[0108] Comparative Example 4

[0109] Preparation of fumigant:

[0110] The fumigant is composed of the following ingredients (mass percentage): 2% pyrethrin, 5% periwinkle extract, 0.5% Tween 80 (adjuvant), and the balance is ethanol.

[0111] The preparation method of azalea extract is as follows: the azalea petals are crushed, and then an ethanol-glycerol mixed solvent (ethanol: glycerol = 9:1, volume ratio) is added in a mass ratio of 1:1 for grinding, and then the mixture is allowed to stand for 24 hours, and an extract is obtained by filtering.

[0112] Preparation method of fumigant:

[0113] Step 1: Mix pyrethrin and carrier evenly.

[0114] Step 2: Add auxiliary agent and frangipani extract, mix thoroughly to obtain fumigant.

[0115] Use the fumigant to control red fire ants:

[0116] Step 1: Cover the ant nest with a cage to prevent red fire ants from escaping.

[0117] Step 2: Release the atomized fumigant from the top of the cover into the cover to fumigate the entire ant nest. The atomized fumigant release rate is 100mL / min, the release time is 10min, and the fumigation temperature is controlled at 35℃.

[0118] Step 3: After 15 minutes, open the cover and you will see dead ants on the anthill and fleeing red fire ants around it.

[0119] Step 4: After three weeks, the number of ant nests and the condition of red fire ants in the nests were observed. There were 13 dead nests and no new ant nests around, with a reduction rate of 86.7%. After eight weeks, two new ant nests were found.

[0120] Example 5 Design of fumigation device

[0121] In order to facilitate the fumigation prevention and control of red fire ants, the inventor designed a special fumigation device.

[0122] like Figure 1 As shown, the device includes the following structure:

[0123] Atomizer 1: used to atomize the drug solution into liquid droplets with a particle size of 1-10 microns.

[0124] Controller 2: The atomizer is connected with a controller for controlling the atomization amount and atomization time.

[0125] Fumigant container 3: The fumigant container is a cylindrical sealed container made of stainless steel, used to store fumigants. The fumigant container is connected to the atomizer.

[0126] Fumigant delivery port 4: tightly attached to fumigant container 3, used for delivering fumigant.

[0127] Support column 5: The support column material is connected to the fumigant container to support the entire device to prevent the fumigant from flowing back during the release process.

[0128] Release system 6; the release system is cylindrical and is used to transport the atomized smoke to the releaser.

[0129] Cone releaser 7: The cone releaser is conical in shape and made of synthetic steel. It can be quickly inserted into the soil and allow the smoke to evaporate into the soil.

[0130] Release cover 8: The cover is cylindrical, made of synthetic steel, corrosion-resistant, connected to the conical releaser 7, and inserted into the soil to cover the entire activity range of the anthill.

[0131] The steps for using the device include:

[0132] Step 1: Place the device in the area where red fire ants are active (on the red fire ant anthill) to cover the entire ant nest, insert the release cover 8 into the deep groove around the ant hill to ensure uniform coverage of the target area to prevent the red fire ants from escaping, and at the same time insert the cone releaser 7 into the center of the ant nest.

[0133] Step 2: Load the fumigant into the container 3 from the fumigant delivery port 4.

[0134] Step 3: Set up the release system, and set the atomization amount and release time of the fumigant by adjusting the controller 2. At this time, the fumigant releases a large amount of smoke through the atomizer 1, which is connected to the release system 6 and transferred to the cone releaser 7, covering the entire anthill activity range with fumigation.

[0135] Experimental Example 1 Screening of Fumigant Ratio

[0136] Different ratios were designed, and experiments were conducted using the method of Example 1 to screen for the optimal ratio.

[0137] Table 1

[0138]

[0139] The experimental results show that:

[0140] The reduction rate of group 1 was 40%, and 4 new ant nests were added after 8 weeks. It shows that the use of plumeria extract alone has no significant effect on the control effect, but the combination with pyrethrin can improve the control effect. The control effect of groups 2 to 6 is equivalent to that of Example 1. Considering the cost factor, the dosage of the main ingredients should not be too high. Therefore, the preferred ratio of the fumigant is: 2% to 6% pyrethrin, 2% to 5% plumeria extract, 0.5% Tween 80 (adjuvant), and the balance is ethanol (carrier).

[0141] Experimental Example 2: Screening of atomization fumigation conditions

[0142] Different atomization fumigation conditions were designed, and the method of Example 1 was used to conduct experiments to screen the optimal ratio.

[0143] Table 2

[0144] Group Fumigant aerosol release Release time Fumigation temperature 1 100mL / min 10min 35℃ 2 150mL / min 10min 40℃ 3 100mL / min 10min 50℃

[0145] The experimental results show that:

[0146] The control effects of Groups 1 to 3 are comparable to those of Example 1. Considering cost and efficiency factors, the atomization fumigation conditions are preferably:

[0147] The fumigant aerosol release rate is 100~150mL / min, the release time is at least 10min, and the fumigation temperature is controlled at 35~50℃.

[0148] The above descriptions are only some embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall fall within the protection scope of the present invention.

Claims

1. A special fumigant for preventing and controlling red fire ants, characterized in that: Calculated by mass percentage, it contains the following ingredients: 2% to 6% pyrethrin, 2% to 15% frangipani extract, Tween, ethanol; The preparation method of the frangipani extract is as follows: after crushing the frangipani petals, adding an organic solvent at a mass ratio of 1:1-2 for grinding, standing for 24 hours after grinding, and filtering to obtain an extract; the organic solvent is ethanol or a mixed solvent of ethanol and glycerol, and the volume ratio of ethanol to glycerol in the mixed solvent of ethanol and glycerol is 7-9:

1.

2. The special fumigant for preventing and controlling red fire ants according to claim 1, characterized in that: Calculated by mass percentage, it is composed of the following ingredients: 2% to 6% pyrethrins, 2% to 15% plumeria extract, at least 0.5% Tween, and the balance is ethanol.

3. The special fumigant for preventing and controlling red imported fire ants according to claim 1, characterized in that: Calculated by mass percentage, it is composed of the following ingredients: 2%~6% pyrethrins, 2%~5% plumeria extract, 0.5% Tween, and the balance is ethanol.

4. The special fumigant for preventing and controlling red fire ants according to claim 1, characterized in that: The composition is composed of the following ingredients by mass percentage: 2% pyrethrins, 2% frangipani extract, 0.5% Tween, and the balance is ethanol.

5. The method for preparing the special fumigant for preventing and treating red imported fire ants according to any one of claims 1 to 4, characterized in that: The following steps are involved: Step 1: Mix pyrethrin and ethanol evenly; Step 2: Add Tween and frangipani extract, mix thoroughly, and obtain a fumigant.

6. The use of the special fumigant for preventing and controlling red imported fire ants according to any one of claims 1 to 4, characterized in that: The application is: used for preventing and controlling red fire ants.

7. The use according to claim 6, characterized in that: The application comprises the following steps: Step 1: Cover the ant nest with a cage to prevent the red fire ants from escaping; Step 2: Release the atomized fumigant into the cover and fumigate the entire ant nest for at least 10 minutes.

8. The use according to claim 7, characterized in that: The fumigant atomizer release rate is 100~150mL / min, the release time is at least 10min, and the fumigation temperature is controlled at 35~50℃.

9. The use according to claim 8, characterized in that: The fumigant atomizer release rate is 100mL / min, the release time is 10min, and the fumigation temperature is controlled at 35℃.

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