An ecological method for controlling rice planthoppers

Abstract

This invention relates to the field of rice cultivation technology, specifically to an ecological method for controlling rice planthoppers. Around the peak of the migrating generation and the second to fifth generations of local rice planthoppers, a distributed flushing irrigation system is used to control rice planthoppers using the following steps: S1. Flooding to kill eggs: By coordinating the paddy field and the distributed flushing irrigation system, the water level in the paddy field is adjusted during the peak adult rice planthopper period and the egg hatching period to reduce the population density of the next generation of rice planthoppers. Specifically, the water level in the paddy field is lowered at the beginning of the adult peak and maintained for a certain number of days. Then, after the peak of rice planthopper egg laying and before the beginning of the egg hatching period, the water level in the paddy field is raised and maintained for a certain number of days to control rice planthoppers. S2. Flushing to remove insects: Hatched rice planthopper larvae that have not been drowned are flushed out of the paddy field using a short-term water flow. The peak of rice planthopper larvae is monitored in the field, and the water level is rapidly raised and then quickly drained to reduce the initial rice planthopper population.

Description

Technical Field

[0001] This invention relates to the field of rice cultivation technology, specifically to a method for ecological control of rice planthoppers. Background Technology

[0002] Currently, chemical control only targets adult rice planthoppers, and is largely ineffective against their eggs. An average adult rice planthopper lays around 350 eggs, with an incubation period of about one week. If initial population control is inadequate, the population grows exponentially after hatching, leading to reduced yields or even crop failure. Furthermore, in the later stages of rice growth, the dense canopy requires chemical pesticides to be mixed with sand to reach the bottom of the plant population, making the control process cumbersome. Moreover, some planthoppers are only stunned by the fumigation and will revive once the pesticide's effectiveness wears off, resulting in low control efficacy. Irrigation is a key factor in ensuring high and stable rice yields. Traditional irrigation methods, such as intermittent irrigation and wet irrigation, provide favorable conditions for rice planthoppers to lay eggs and hatch, increasing their population. Meanwhile, the rice planthopper population development pattern shows that the population is low from transplanting to the peak tillering stage (low-risk period), develops rapidly during the booting stage (medium-risk period), and reaches its peak from heading to yellow ripening stage (high-risk period). The booting stage to yellow ripening stage is the critical period for controlling rice planthoppers, which is also the main water-saving stage of traditional irrigation methods. This makes it easy for rice planthoppers to break out and cause disasters under traditional irrigation methods. Summary of the Invention

[0003] The purpose of this invention is to solve the problems in the background art and provide an ecological method for controlling rice planthoppers.

[0004] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0005] An ecological method for controlling rice planthoppers involves using a distributed flushing irrigation system around the peak of the migrating generation and the second to fifth generations of local rice planthoppers, employing the following steps:

[0006] S1. Flooding for Egg Killing: Utilizing the combined use of paddy fields and distributed flushing irrigation systems, the water level in the paddy fields is adjusted during the peak adult infestation and egg hatching periods to reduce the population density of the next generation of rice planthoppers. Specifically, the water level is lowered during the initial peak adult infestation period and maintained for a certain number of days. Then, after the peak egg-laying period and before the initial peak egg hatching period, the water level is raised and maintained for a certain number of days, thereby controlling the rice planthoppers.

[0007] S2. Flushing to eliminate pests: The hatched rice planthopper larvae that have not been drowned are flushed out of the paddy field by a short-term water flow. The peak of rice planthopper larvae is monitored in the field. The water level is quickly raised and then the paddy field is drained to reduce the base population of rice planthoppers.

[0008] Preferably, the distributed irrigation system includes: an inlet pump, distributed irrigation pipes, rotary nozzles, a pump, a drain pipe, a water level sensor, and a filter detection box; the distributed irrigation pipes include: a main pipe and several branch pipes, the inlet pump is installed at the main pipe, the several branch pipes are spaced parallel to each other in the paddy field, the top of the branch pipes is connected to the main pipe, the rotary nozzles are spaced apart on the rotary nozzle branch pipes, the water level sensor is installed in the paddy field, the water level sensor contains a wireless signal transmitter, and the filter detection box is installed between the paddy field and the drain pipe.

[0009] Preferably, the distributed flushing irrigation system is further provided with a return water pipe and a return water valve. The return water valve is located at the end of the drain pipe, and the two ends of the return water pipe are respectively connected to the main pipe and the return water valve.

[0010] Preferably, in step S2, when the peak of rice planthopper larvae is detected in the field, the water level is quickly raised to more than 20cm using the paddy field irrigation system. At the same time, the rice plants are sprayed by rotating nozzles, causing the rice plants to shake and thus washing the rice planthoppers into the water. Meanwhile, the drainage pipe is used to continuously drain water for more than 3 days until no more rice planthoppers or their eggs are detected in the filter detection box.

[0011] Preferably, in step S1, for rice planthoppers migrating into the paddy field, the water level in the paddy field is lowered to below 3 cm within 3 days after the peak of their migration, so that the paddy field soil is moist but without water accumulation, and this is maintained for 10 days. After transplanting and greening up, the water level is lowered in conjunction with paddy field drying to control rice planthoppers. After 10 days, the water level is raised to 20-40 cm and maintained for more than 7 days.

[0012] Preferably, in step S1, for rice planthoppers that breed locally, within 7 days after the peak of adult emergence, the water level in the paddy field is lowered to below 3cm, keeping the paddy field soil moist but without water accumulation, and this is maintained for 5-10 days. This is combined with paddy field drying to lower the water level to control rice planthoppers. After 10 days, the water level is raised to 20-40cm and maintained for more than 7 days.

[0013] Preferably, the filtration and detection box includes: a drainage inlet, an interception and separation mechanism, a conveying mechanism, a sorting and detection mechanism, and an impurity discharge mechanism; the interception and separation mechanism includes: a wastewater tank and a drainage mesh plate, the wastewater tank being connected to the drainage inlet, and the drainage mesh plate being disposed on the upper part of the side of the wastewater tank; the conveying mechanism is an inclined belt conveyor, with its bottom disposed above the wastewater tank and its top disposed above the sorting and detection mechanism, and a conveying plate being disposed on the belt surface of the belt conveyor; the sorting and detection mechanism includes: a sorting box, a sorting drum, and an insect collection box, the outer circumference of the sorting drum being provided with blind holes for sorting, and leak-proof baffles being disposed between the two sides of the sorting box and the sorting drum, the leak-proof baffles being tangentially disposed to the outer circumference of the sorting drum; the impurity discharge mechanism includes: an impurity box and a discharge belt device, the discharge belt device being disposed above the sorting drum, and a conveying plate being disposed on the belt surface of the discharge belt device.

[0014] Preferably, the diameter of the drainage mesh is less than 0.5 mm, and the diameter of the blind holes is 0.5 mm to 1.5 mm.

[0015] In summary, this invention, through a combination of flooding to kill eggs and spraying to drain water, effectively removes rice planthoppers from paddy fields without the use of pesticides, reduces their density in the field, and achieves complete control of rice planthoppers without the use of pesticides, thus playing a role in the ecological control of rice planthoppers in rice. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the distributed flushing and discharging irrigation system in this invention;

[0017] Figure 2 This is a schematic diagram of the filter detection box in this invention;

[0018] Figure 3 This is a schematic diagram of the return water pipe in this invention. Detailed Implementation

[0019] The following specific embodiments are merely illustrative of the present invention and are not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to these embodiments without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of the present invention.

[0020] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Example 1

[0021] An ecological method for controlling rice planthoppers involves using a distributed flushing irrigation system around the peak of the migrating generation and the second to fifth generations of local rice planthoppers, employing the following steps:

[0022] S1. Flooding for Egg Killing: Utilizing the combined use of paddy fields and distributed flushing irrigation systems, the water level in the paddy fields is adjusted during the peak adult infestation and egg hatching periods to reduce the population density of the next generation of rice planthoppers. Specifically, the water level in the paddy fields is lowered at the beginning of the adult infestation and maintained for a certain number of days. Then, after the peak egg-laying period of rice planthoppers and before the beginning of egg hatching, the water level in the paddy fields is raised and maintained for a certain number of days. This achieves control of rice planthoppers. For migrating generations of rice planthoppers, the water level in the paddy fields is lowered to 3 meters within 3 days after their migration peak. For rice planthoppers, keep the water level below 3 cm to keep the paddy field soil moist but not waterlogged for 10 days. After transplanting and the rice plants have recovered, combine this with paddy field drying to lower the water level to control rice planthoppers. After 10 days, raise the water level to 20-40 cm and keep it at that level for at least 7 days. For rice planthoppers that breed locally, within 7 days after the peak of adult emergence, lower the water level in the paddy field to below 3 cm, keep the paddy field soil moist but not waterlogged for 5-10 days, combine this with paddy field drying to lower the water level to control rice planthoppers. After 10 days, raise the water level to 20-40 cm and keep it at that level for at least 7 days.

[0023] The distributed irrigation system includes: an inlet pump 1, a distributed irrigation pipe 2, a rotary nozzle 3, a pump 4, a drain pipe 5, a water level sensor 6, and a filter detection box 7. The distributed irrigation pipe 2 includes: a main pipe 21 and several branch pipes 22. The inlet pump 1 is installed at the main pipe 21. Several branch pipes 22 are spaced parallel to each other in the paddy field. The top of each branch pipe 22 is connected to the main pipe 21. The rotary nozzles 3 are spaced apart on the branch pipes 22. The water level sensor 6 is installed in the paddy field and contains a wireless signal transmitter. The filter detection box 7 is located between the paddy field and the drain pipe 5.

[0024] according to Figure 2As shown, the filter detection box 7 includes: a drainage inlet 71, an interception and separation mechanism 72, a conveying mechanism 73, a sorting and detection mechanism 74, and an impurity discharge mechanism 75; the interception and separation mechanism 72 includes: a wastewater tank 721 and a drainage mesh plate 722, the wastewater tank 721 being connected to the drainage inlet 71, and the drainage mesh plate 722 being disposed on the upper part of the side of the wastewater tank 721, the mesh diameter of the drainage mesh plate 722 being less than 0.5mm; the conveying mechanism 73 is an inclined belt conveyor, its bottom being disposed above the wastewater tank 721, and its top being disposed above the sorting and detection mechanism 74, the belt surface of the belt conveyor being provided with a conveyor plate. The sorting and detection mechanism 74 includes: a sorting box 741, a sorting drum 742, and an insect collection box 743. The outer circumference of the sorting drum 742 is provided with a blind hole 744 for sorting. The diameter of the blind hole 744 is 0.5mm~1.5mm. Leakage prevention baffles 7411 are provided between the two sides of the sorting box 741 and the sorting drum 742. The leakage prevention baffles 7411 are tangential to the outer circumference of the sorting drum 742. The impurity discharge mechanism 75 includes: an impurity box 751 and a discharge belt device 752. The discharge belt device 752 is located above the sorting drum 742. The belt surface of the discharge belt device 752 is provided with a conveyor plate.

[0025] S2. Water flushing to remove pests: Hatched rice planthopper larvae that have not been drowned are flushed out of the paddy field by a short water flow. The peak of rice planthopper larvae is monitored in the field. The water level is quickly raised and then the paddy field is drained to reduce the rice planthopper population. When the peak of rice planthopper larvae is detected in the field, the water level is quickly raised to more than 20cm using the paddy field irrigation system. At the same time, the rice plants are sprayed by rotating nozzles 3, which makes the rice plants shake and flush the rice planthoppers into the water. Meanwhile, the drainage pipe 5 is used to continuously drain the water for more than 3 days until no rice planthoppers or their eggs are detected in the filter detection box 7.

[0026] The filter detection box 7 is connected to the drain pipe 5 via the drain inlet 71. Wastewater first enters the interception and separation mechanism 72, and is discharged after being filtered through the drain screen 722. Remaining debris, such as leaves, straw, insect eggs, and larvae, is conveyed by the conveyor mechanism 73 to the top of the sorting drum 742 for sorting. The blind holes 744 with a diameter of 0.5mm to 1.5mm effectively screen out rice planthopper eggs and larvae into the insect collection box 743. Other impurities pass through and are sent to the impurity box 751 by the discharge belt device 752. The staff determines whether to continue flushing to remove insects based on the condition of the insect collection box 743. Example 2

[0027] according to Figure 3As shown, the distributed flushing irrigation system 100 is also equipped with a return water pipe 8 and a return water valve 9. The return water valve 9 is located at the end of the drain pipe 5, and the two ends of the return water pipe 8 are connected to the main pipe 21 and the return water valve 9, respectively. This achieves the effect of recycling water and saving water. Example 3

[0028] From July 10th to 23rd, the water level in paddy fields 1, 2, 3, and 4 was maintained at 1-3 cm. A survey on July 23rd showed a peak in rice planthoppers. Subsequently, the water level was rapidly raised to over 20 cm in a short period, followed by continuous and rapid drainage. This was continued for four days before drainage was stopped, and the water level was lowered to below 2 cm. The density of rice planthoppers in the fields was investigated on July 28th.

[0029] During the peak period of rice planthoppers, the water level in the paddy field is rapidly increased and then drained continuously.

[0030] Example 4

[0031] From July 10 to 23, the water level in paddy fields 5, 6 and 7 was maintained at 1-3 cm. On July 23, 2021, a survey showed that rice planthoppers were at their peak in the paddy fields. After that, the water level in the paddy fields was rapidly raised to more than 20 cm in a short period of time, and drainage was carried out rapidly. The water level was then maintained at 20 cm for 7 days.

[0032] Example 5

[0033] For fields 8, 9, and 10, the water level was kept below 3cm from August 1st to 11th. Starting from August 12th, the water level was rapidly and naturally raised to above 20cm and maintained for 3 days. After draining for 3 consecutive days and maintaining a water level of 20cm for 7 days, the insect population reduction rate in the paddy fields was as follows.

[0034]

Claims

1. A method for ecological control of rice planthoppers, characterized in that, Around the peak of the migrating generation and the second to fifth generations of local rice planthoppers, the following steps are used to control rice planthoppers using a distributed flushing irrigation system: S1. Flooding to kill eggs: By coordinating paddy fields and distributed flushing irrigation systems, the water level in the paddy fields is adjusted during the peak adult infestation period and the egg hatching period to reduce the population density of the next generation of rice planthoppers. Specifically, the water level in the paddy fields is lowered during the initial peak of adult infestation and maintained for a certain number of days. Then, after the peak of rice planthopper egg laying and before the initial peak of egg hatching, the water level in the paddy fields is raised and maintained for a certain number of days to control rice planthoppers. The distributed irrigation system includes: an inlet pump (1), a distributed irrigation pipe (2), a rotary nozzle (3), a pump (4), a drain pipe (5), a water level sensor (6), and a filter detection box (7); the distributed irrigation pipe (2) includes: a main pipe (21) and several branch pipes (22), the inlet pump (1) is installed at the main pipe (21), and several branch pipes (22) are spaced parallel to each other in the paddy field, the top of the branch pipes (22) is connected to the main pipe (21), and the rotary nozzle (4) is installed at the main pipe (21). 3) The rotating nozzle (3) is spaced on the branch pipe (22), the water level sensor (6) is installed in the paddy field, the water level sensor (6) is equipped with a wireless signal transmitter, the filter detection box (7) is installed between the paddy field and the drainage pipe (5), the distributed flushing irrigation system is also equipped with a return water pipe (8) and a return water valve (9), the return water valve (9) is installed at the end of the drainage pipe (5), and the two ends of the return water pipe (8) are respectively connected to the main pipe (21) and the return water valve (9); The filter detection box (7) includes: a drainage inlet (71), an interception and separation mechanism (72), a conveying mechanism (73), a sorting and detection mechanism (74), and an impurity discharge mechanism (75); the interception and separation mechanism (72) includes: a wastewater tank (721) and a drainage mesh plate (722), the wastewater tank (721) is connected to the drainage inlet (71), and the drainage mesh plate (722) is located on the upper part of the side of the wastewater tank (721); the conveying mechanism (73) is an inclined belt conveyor, the bottom of which is located above the wastewater tank (721), and the top of which is located above the sorting and detection mechanism (74), and the belt surface of the belt conveyor is provided with a conveying plate; the sorting and detection mechanism (74) includes: a sorting box body (741) The system comprises a sorting drum (742) and an insect collection box (743). The outer circumference of the sorting drum (742) is provided with blind holes (744) for sorting. The two sides of the sorting box (741) are provided with anti-leakage baffles (7411) between the sorting drum (742) and the sides of the sorting box (7411). The anti-leakage baffles (7411) are tangential to the outer circumference of the sorting drum (742). The impurity discharge mechanism (75) includes an impurity box (751) and a discharge belt device (752). The discharge belt device (752) is located above the sorting drum (742). The belt surface of the discharge belt device (752) is provided with a conveying plate. The diameter of the drainage mesh plate (722) is less than 0.5 mm, and the diameter of the blind hole (744) is 0.5 mm to 1.5 mm. S2. Water flushing to remove insects: The hatched rice planthopper larvae that have not been drowned are flushed out of the paddy field by a short water flow. The peak of rice planthopper larvae is monitored in the field. The water level is raised rapidly and the paddy field water level is drained quickly to reduce the base number of rice planthoppers. When the peak of rice planthopper larvae is monitored in the field, the water level is raised rapidly to more than 20cm by the paddy field irrigation system. At the same time, the rice plants are sprayed by rotating nozzles (3) to make the rice plants shake and flush the rice planthoppers into the water. At the same time, the drainage pipe (5) is used to continuously drain water for more than 3 days until no more rice planthoppers or their eggs are detected in the filter detection box (7).

2. The method for ecological control of rice planthoppers according to claim 1, characterized in that, In step S1, for rice planthoppers migrating into the paddy field, within 3 days after their peak migration, the water level in the paddy field is lowered to below 3cm to keep the soil moist but without standing water. This is maintained for 10 days. After transplanting and the plants have recovered, the water level is lowered in conjunction with paddy field drying to control rice planthoppers. After 10 days, the water level is raised to 20-40cm and maintained for more than 7 days.

3. The method for ecological prevention and control of rice planthoppers according to claim 1, characterized in that, In step S1, for rice planthoppers that breed locally, within 7 days after the peak of adult emergence, the water level in the paddy field is lowered to below 3cm, keeping the paddy field soil moist but without water accumulation, and this is maintained for 5-10 days. This is combined with paddy field drying to lower the water level to control rice planthoppers. After 10 days, the water level is raised to 20-40cm and maintained for more than 7 days.

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