Comprehensive ecological prevention and control method for diaphorina citri

Abstract

The invention belongs to the technical field of agricultural pest control, and particularly relates to a comprehensive ecological prevention and control method for diaphorina citri. The comprehensive ecological prevention and control method for diaphorina citri comprises the following steps: establishing an isolation net wall around a citrus orchard, and planting nectariferous plants in the isolation net wall. The isolation net wall is a 40-mesh plastic insect-proof net and can prevent phylloxera from flying into the net. The honey source plant refers to cnidium monnieri, and the cnidium monnieri planted between the rows of the fruit trees can conserve and proliferate natural enemies and enhance the biological control effect of natural enemies on phylloxera. According to the method, physical prevention and control are combined with biological prevention and control, the number of diaphorina citri can be effectively reduced, prevention and control pressure is relieved, and the method is of great significance to ecological regulation and control of diaphorina citri and green development of the navel orange industry.

Description

Technical Field

[0001] The present invention belongs to the technical field of agricultural pest control, and particularly relates to a comprehensive ecological prevention and control method for Diaphorina citri. Background Art

[0002] Huanglongbing of citrus is a devastating disease caused by infection with Candidatus Liberibacter spp., which seriously affects the yield and quality of citrus. The vector for Huanglongbing is Diaphorina citri. At present, the prevention and control of Huanglongbing mainly rely on the control of Diaphorina citri. The integrated pest management generally includes measures such as plant quarantine, insect-resistant breeding, chemical control, agricultural control, physical control, and biological control. Diaphorina citri can feed on Rutaceae plants such as oranges, tangerines, mandarins, and grapefruits. At present, there is no resistant variety against Diaphorina citri, and the control of Diaphorina citri mainly relies on chemical control at present. However, the long-term use of chemical pesticides will lead to a series of problems such as a large number of natural enemy insects dying in citrus orchards, the loss of biodiversity, pests developing varying degrees of pesticide resistance, and excessive pesticide residues in fruits. Therefore, there is an urgent need to seek new methods for controlling Diaphorina citri.

[0003] Using insect-proof nets in orchards to control Diaphorina citri includes two methods: full-coverage nets and isolation net walls. In Xunwu, Ganzhou and other places, the planting method of full-coverage nets is very popular. Although this method can block Diaphorina citri, there are also disadvantages. Firstly, the investment cost is very high. In addition to the natural aging and damage of the insect-proof net, extreme weather such as snowfall or typhoons may cause damage to the net rack, which increases the later maintenance cost. Secondly, the top insect-proof net leads to insufficient light, affecting fruit coloring and quality; the full-coverage net causes poor air circulation inside the orchard, the temperature rises, increasing the difficulty of controlling citrus red spider mites and anthracnose, and the temperature difference inside and outside the net decreases, affecting the taste of fruits; there is a net on the top of the orchard and many support rods inside, which also affects the use of plant protection drones.

[0004] The isolation net wall refers to the method of building an insect-proof net wall with a height of 5 meters around the orchard. This method can effectively prevent adult Diaphorina citri from flying in and can avoid most of the disadvantages of full-coverage nets. However, the height of the net wall is basically fixed, and navel orange trees are generally planted on mountains. The top edge of the net wall at the valley is often several meters to more than ten meters lower than the top edge of the net wall at the mountain peak. In the face of strong convective weather such as strong winds and typhoons, Diaphorina citri can still be blown into the net by the wind. It is difficult to completely isolate Diaphorina citri only relying on the isolation net wall. If the Diaphorina citri flying into the net cannot be discovered in time, there is a risk of spreading Huanglongbing, and once the Diaphorina citri lays eggs, the population of Diaphorina citri inside the net wall will increase sharply.

[0005] Therefore, a new method is needed to ensure the control effect on Diaphorina citri. Summary of the Invention

[0006] The purpose of the present invention is to provide a comprehensive ecological prevention and control method for Diaphorina citri, which can effectively reduce the number of Diaphorina citri.

[0007] The present invention provides a comprehensive ecological prevention and control method for Diaphorina citri, which includes establishing an isolation net wall around the citrus orchard and planting nectar plants within the net wall; the nectar plants include Cnidium monnieri (L.) Cusson.

[0008] As a preferred solution, the establishment of the isolation net wall includes the following steps: setting a column every 5 m around the citrus orchard, fixing the insect-proof net on the columns, setting the top of the insect-proof net into a sleeve structure, compacting the lower part of the insect-proof net with soil, and leaving an access door on one side of the insect-proof net to obtain the isolation net wall.

[0009] As a preferred solution, the mesh number of the insect-proof net is 40 meshes; the building height of the insect-proof net is 5 m.

[0010] As a preferred solution, it includes sewing the top of the insect-proof net into a sleeve structure. When sewing, the pressing line and the foot line are selected from steel wire materials. The pressing line passes through the sleeve and is fixed on the column; the width of the access door is not less than 130 cm.

[0011] As a preferred solution, the planting method of the nectar plants includes field sowing and / or transplanting after indoor seedling raising.

[0012] As a preferred solution, the field sowing includes the following steps: applying a base fertilizer to the plot and then rotary tilling and loosening the soil to form a Cnidium monnieri (L.) Cusson planting belt, scattering Cnidium monnieri (L.) Cusson seeds into the Cnidium monnieri (L.) Cusson planting belt and then covering the soil, and watering until the soil moisture content is not less than 50%.

[0013] As a preferred solution, the width of the Cnidium monnieri (L.) Cusson planting belt is 40 - 60 cm; the depth of the rotary tilling and loosening of the soil is 15 - 25 cm.

[0014] As a preferred solution, before sowing the Cnidium monnieri (L.) Cusson seeds, it also includes soaking the Cnidium monnieri (L.) Cusson seeds with water and mixing the soaked Cnidium monnieri (L.) Cusson seeds with soil.

[0015] As a preferred solution, the soaking time is 22 - 26 h; the volume ratio of the soaked Cnidium monnieri (L.) Cusson seeds to soil is 1:1; the dosage of the Cnidium monnieri (L.) Cusson seeds is 1.3 - 1.7 kg / mu; the thickness of the covered soil is less than 1 cm.

[0016] As a preferred solution, the indoor seedling raising and transplanting of Cnidium monnieri (L.) Cusson includes the following steps: watering the seedling tray until it is thoroughly wet, placing Cnidium monnieri (L.) Cusson seeds into the holes and then covering the soil, keeping the substrate nutrient soil in a moist state, and transplanting the Cnidium monnieri (L.) Cusson seedlings to the Cnidium monnieri (L.) Cusson planting area in February.

[0017] As a preferred solution, the substrate nutrient soil includes humus soil, peat soil, perlite and vermiculite; the volume ratio of the humus soil, peat soil, perlite and vermiculite is 4:2:1:1.

[0018] As a preferred solution, the number of Cnidium monnieri seeds placed in each hole is 3 to 8; the thickness of the soil covering is less than 1 cm.

[0019] Beneficial effects: The present invention provides a comprehensive ecological control method for Diaphorina citri. The comprehensive ecological control method for Diaphorina citri includes establishing an isolation net wall around the citrus orchard and planting nectar source plants within the net wall. The net wall is a 40-mesh plastic insect-proof net, which can block the entry of Diaphorina citri into the net. The nectar source functional plant refers to Cnidium monnieri. Planting Cnidium monnieri between fruit trees can conserve and increase natural enemies, enhancing the biological control effect of natural enemies on Diaphorina citri. The present invention adopts a method combining physical control and biological control, which can effectively reduce the number of Diaphorina citri, relieve the control pressure, and is of great significance for the ecological regulation of Diaphorina citri and the green development of the navel orange industry.

[0020] The method adopted by the present invention is not a single method of establishing an isolation net wall to block Diaphorina citri, but a means of combining physical control and biological control. On the one hand, using the net wall can block most of the Diaphorina citri outside the net wall. On the other hand, by planting nectar source functional plants to conserve natural enemy insects, natural enemies such as ladybugs and green lacewings can prey on the Diaphorina citri that fly into the net due to extreme weather, enhancing the ecological control effect.

[0021] While controlling Diaphorina citri, predatory natural enemies can also prey on small pests such as aphids, thrips, and whiteflies, reducing the population numbers of other pests and relieving the control pressure. Reducing the use of chemical pesticides reduces the pollution of fruits and the environment, is beneficial to the protection of the ecological system, ensures the safe production of navel oranges, and achieves the purpose of ecological pest control.

[0022] The isolation net wall is different from a full-coverage net. Due to the lack of a ceiling, no columns need to be built in the orchard, greatly reducing the construction cost and maintenance cost. At the same time, it is beneficial to ventilation, maintaining the temperature difference inside and outside the net, and the operation of drones. After enclosing the net, the humidity inside the orchard is still higher than that outside, which is beneficial to the growth of nectar source functional plants such as Cnidium monnieri and also promotes the proliferation of natural enemy insects. Specific implementation method

[0023] The present invention provides a comprehensive ecological control method for Diaphorina citri, including establishing an isolation net wall around the citrus orchard and planting nectar source plants within the net wall; the nectar source plants include Cnidium monnieri.

[0024] The establishment of the isolation net wall in the present invention includes the following steps: setting a column every 5 m around the citrus orchard, fixing the insect-proof net on the column, setting the top of the insect-proof net into a sleeve structure, compacting the lower part of the insect-proof net with soil, and leaving an access door on one side of the insect-proof net to obtain the isolation net wall.

[0025] As a specific implementation manner, the mesh number of the insect-proof net is 40 meshes; the construction height of the insect-proof net is 5 m; in the control experiment 3 of the present invention where only the isolation net wall is constructed, the reduction ratio of the number of Diaphorina citri reaches 60.25%, and the isolation net wall has an obvious effect on blocking Diaphorina citri from flying into the net.

[0026] As a specific implementation manner, the construction of the isolation net wall of the present invention includes sewing the top of the insect-proof net into a sleeve structure. When sewing, the pressing line and the foot line are selected to be made of steel wire. The pressing line passes through the sleeve and is fixed on the column; the width of the access door is not less than 130 cm, which is convenient for machinery such as rotary tillers to enter and exit. The isolation net wall of the present invention is different from the full-coverage net. Due to the lack of a ceiling, columns do not need to be built in the orchard, which greatly reduces the construction cost and maintenance cost. At the same time, it is beneficial to ventilation and air permeability, maintaining the temperature difference inside and outside the net, and the operation of unmanned aerial vehicles. After enclosing the orchard, the humidity inside the orchard is still higher than that outside, which is beneficial to the growth of nectar-source functional plants such as Cnidium monnieri and also promotes the proliferation of natural enemy insects.

[0027] The planting method of the nectar-source plants of the present invention includes field sowing and / or transplanting after indoor seedling raising. The planting of Cnidium monnieri of the present invention includes autumn sowing and spring sowing; the autumn sowing includes field sowing and / or transplanting after indoor seedling raising; the spring sowing includes field sowing. The time for autumn sowing is the middle and late November; the time for spring sowing is from March to May. The months in the present invention are Gregorian calendar months; in order to ensure the large-scale cultivation of Cnidium monnieri, Cnidium monnieri can be planted every year.

[0028] The field sowing of the present invention includes the following steps: applying a base fertilizer to the plot and then rotary tilling and loosening the soil to form a Cnidium monnieri planting belt, scattering Cnidium monnieri seeds into the Cnidium monnieri planting belt and then covering the soil, and watering until the soil moisture content is not less than 50%; as a specific implementation manner, the soil moisture content can be 50%, 60%, 70% or 80%. The Cnidium monnieri planting belt of the present invention is in the inter-row strip of the citrus orchard.

[0029] The width of the cnidium monnieri planting belt described in the present invention is 40 - 60 cm; the depth of rotary tillage and soil loosening is 15 - 25 cm. As a specific implementation method, the width of the planting belt can be 40 cm, 41 cm, 42 cm, 43 cm, 44 cm, 45 cm, 46 cm, 47 cm, 48 cm, 49 cm, 50 cm, 51 cm, 52 cm, 53 cm, 54 cm, 55 cm, 56 cm, 57 cm, 58 cm, 59 cm or 60 cm; according to the planting conditions of citrus orchards in southern Jiangxi and the operating conditions of rotary tillers, the present invention sets the width of the planting belt, which can not only ensure that the planting area of the citrus orchard is not restricted, but also ensure mechanical operation by the rotary tiller. As a specific implementation method, the depth of rotary tillage and soil loosening can be 15 cm, 16 cm, 17 cm, 18 cm, 19 cm, 20 cm, 21 cm, 22 cm, 23 cm, 24 cm or 25 cm.

[0030] Before sowing the cnidium monnieri seeds of the present invention, it also includes soaking the cnidium monnieri seeds with water and mixing the soaked cnidium monnieri seeds with soil; as a specific implementation method, the soaking time is 22 - 26 h; the volume ratio of the soaked cnidium monnieri seeds to soil is 1:1; the dosage of the cnidium monnieri seeds is 1.3 - 1.7 kg / mu; the thickness of the soil covering is less than 1 cm. As a specific implementation method, the soaking time can be 22 h, 23 h, 24 h, 25 h or 26 h. The present invention mixes the soaked cnidium monnieri seeds with soil, which can prevent the soaked cnidium monnieri seeds from aggregating into a ball, and after adding soil, the cnidium monnieri seeds are dispersed, which is beneficial for spreading. As a specific implementation method, the dosage of the cnidium monnieri seeds can be 1.3 kg / mu, 1.4 kg / mu, 1.5 kg / mu, 1.6 kg / mu or 1.7 kg / mu. As a specific implementation method, the thickness of the soil covering can be 0.9 cm, 0.8 cm or 0.7 cm.

[0031] The experimental examples of the present invention show that the ability of nectar source plant - planted citrus orchards to conserve natural enemies within the isolation net wall is higher than that of citrus orchards with only an isolation net wall established. This is mainly because nectar - function plants in citrus orchards have the ability to conserve and increase natural enemies. Especially cnidium monnieri provides a good shelter for predatory natural enemies, and ladybugs and green lacewings can then transfer to citrus trees to prey on adult, nymph and eggs of Diaphorina citri, enhancing the control effect of natural enemies on Diaphorina citri. Among several nectar source plants such as cnidium monnieri, rape and cosmos, the proportion of reduction of Diaphorina citri in the cnidium monnieri - planted area is the largest, indicating that the ability of cnidium monnieri to conserve and increase predatory natural enemies is higher than that of rape and cosmos. The above shows that the method of the present invention, which combines building an isolation net wall around the citrus orchard and planting functional plants between fruit trees, can effectively control Diaphorina citri.

[0032] The indoor seedling raising and transplanting of the present invention includes the following steps: watering the plug tray until it is thoroughly wet, placing the Cnidium monnieri seeds into the holes and then covering them with soil, keeping the substrate nutrient soil in a moist state, and transplanting the Cnidium monnieri seedlings to the Cnidium monnieri planting area in February.

[0033] As a specific embodiment, the substrate nutrient soil includes humus soil, peat soil, perlite and vermiculite; the volume ratio of the humus soil, peat soil, perlite and vermiculite is 4:2:1:1; as a specific embodiment, the number of Cnidium monnieri seeds placed in each hole is 3 - 8 grains; the thickness of the soil covering is less than 1 cm. As a specific embodiment, the number of Cnidium monnieri seeds placed in each hole can be 3 grains, 4 grains, 5 grains, 6 grains, 7 grains or 8 grains. As a specific embodiment, the thickness of the soil covering can be 0.9 cm, 0.8 cm or 0.7 cm.

[0034] While preventing and controlling the Asian citrus psyllid, the predatory natural enemies can simultaneously prey on small pests such as aphids, thrips and whiteflies, reducing the population numbers of other pests and the prevention and control pressure. The use of chemical pesticides is reduced, the pollution to fruits and the environment is decreased, which is beneficial to the protection of the ecosystem, ensures the safe production of navel oranges, and achieves the purpose of ecological pest control.

[0035] The method adopted by the present invention is not a single method of establishing an isolation net wall to block the Asian citrus psyllid, but a means of combining physical control and biological control. On the one hand, using the net wall can block most of the Asian citrus psyllids outside the net wall, and on the other hand, by planting nectar - producing functional plants to conserve natural enemy insects, natural enemies such as ladybugs and green lacewings can prey on the psyllids that fly into the net due to extreme weather, enhancing the ecological prevention and control effect.

[0036] In order to further illustrate the present invention, the following combines examples to describe in detail a comprehensive ecological prevention and control method for the Asian citrus psyllid provided by the present invention, but they cannot be understood as limiting the protection scope of the present invention.

[0037] Unless otherwise specified, the present invention has no special requirements for the preparation raw materials, and commercially available products well - known to those skilled in the art can be used.

[0038] Example 1

[0039] (1) Construction of the isolation net wall: Select the embedded installation method. The columns are made of galvanized steel pipes. Dig a pit with a depth of 50 cm every 5 m around the orchard, place the columns in the pits, pour in cement, and wait for the cement to dry and check its safety before connecting the insect-proof net. The insect-proof net is made of 40-mesh plastic material with a height of 5 m. The top of the insect-proof net is sewn into a sleeve structure. The top wire, middle waist wire, and bottom foot wire are made of steel wire. The top wire is threaded through the sleeve to stretch the insect-proof net. Use buckles and hoop clamps to tighten and fix the steel wire on the columns, making the net in a stretched and taut state. The bottom insect-proof net is compacted with soil to avoid leaving gaps. The isolation net wall is reserved with access doors. The access doors are selected with galvanized iron as the frame and the insect-proof net as the main facing material. The width of the access doors is not less than 130 cm to facilitate the entry and exit of machinery such as rotary tillers.

[0040] (2) Planting of nectar source plants: The nectar source plant selected and used in the present invention is Cnidium monnieri, and the nectar source plants are planted inside the isolation net wall.

[0041] Autumn sowing in the field (mid-November): Select an orchard that meets the watering conditions, apply base fertilizer to the Cnidium monnieri planting belt, use a rotary tiller to loosen the soil, and the tillage depth is 25 cm, and the width of the planting belt is 60 cm. Soak the seeds of Cnidium monnieri in clean water (soak for 24 h), mix the soaked Cnidium monnieri seeds with soil in a volume ratio of 1:1 evenly, and evenly sprinkle the mixed Cnidium monnieri seeds (the dosage of Cnidium monnieri seeds is 1.5 kg / mu) into the strip and slightly cover with thin soil (the thickness is less than 1 cm). After sowing, carry out sprinkler irrigation, and regularly irrigate to keep the soil moist until the seeds germinate, and then water appropriately according to the soil moisture content (the soil water content is not less than 50%) until spring rainfall.

[0042] Example 2

[0043] (1) Construction of the isolation net wall: Select the embedded installation method. The columns are made of galvanized steel pipes. Dig a pit with a depth of 50 cm every 5 m around the orchard, place the columns in the pits, pour in cement, and wait for the cement to dry and check its safety before connecting the insect-proof net. The insect-proof net is made of 40-mesh plastic material with a height of 5 m. The top of the insect-proof net is sewn into a sleeve structure. The top wire, middle waist wire, and bottom foot wire are made of steel wire. The top wire is threaded through the sleeve to stretch the insect-proof net. Use buckles and hoop clamps to tighten and fix the steel wire on the columns, making the net in a stretched and taut state. The bottom insect-proof net is compacted with soil to avoid leaving gaps. The isolation net wall is reserved with access doors. The access doors are selected with galvanized iron as the frame and the insect-proof net as the main facing material. The width of the access doors is not less than 130 cm to facilitate the entry and exit of machinery such as rotary tillers.

[0044] (2) Planting of nectar source plants: The nectar source plant selected and used in the present invention is Cnidium monnieri, and the nectar source plants are planted inside the isolation net wall.

[0045] Spring sowing in the field (early March): Select an orchard with watering conditions, apply basal fertilizer to the planting belt of Cnidium monnieri, use a rotary tiller to till and loosen the soil, with a tillage depth of 20 cm and a planting belt width of 40 cm. Soak the seeds of Cnidium monnieri in clear water (soak for 22 h), mix the soaked seeds of Cnidium monnieri with soil in a volume ratio of 1:1, evenly scatter the mixed Cnidium monnieri seeds (the dosage of Cnidium monnieri seeds is 1.3 kg / mu) into the strip and slightly cover with thin soil (thickness less than 1 cm). After sowing, water slightly (according to the soil moisture and precipitation, make the soil water content not less than 50%).

[0046] Example 3

[0047] (1) Construction of the isolation net wall: Select the embedded installation method, and the columns are made of galvanized steel pipes. Dig a pit with a depth of 50 cm every 5 m around the orchard, put the columns into the pits, pour in cement, and after the cement dries and its safety is checked, then connect the insect-proof net. The insect-proof net is made of 40-mesh plastic material with a height of 5 m. The top of the insect-proof net is sewn into a sleeve structure. The top pressing wire, middle waist wire, and bottom foot wire are made of steel wire material. The pressing wire passes through the sleeve to stretch the insect-proof net. Use buckles and hoop clamps to tighten the steel wire and fix it on the column to make the net in a stretched and straightened state. The bottom insect-proof net is compacted with soil to avoid leaving gaps. The isolation net wall is reserved with access doors. The access doors are framed with galvanized iron and mainly made of insect-proof net, and the width of the access doors is not less than 130 cm to facilitate the entry and exit of machinery such as rotary tillers.

[0048] (2) Planting of nectar source plants: The nectar source plant selected and used in the present invention is Cnidium monnieri, and the nectar source plants are planted inside the isolation net wall.

[0049] Autumn sowing: Seedling raising indoors and then transplanting (late November): Seedling raising indoors is to cultivate the seeds of Cnidium monnieri in a plug tray. Before placing the seeds, first water the substrate nutrient soil in the plug tray until it is thoroughly wet. After placing the seeds of Cnidium monnieri in each hole (the number of seeds of Cnidium monnieri placed in each hole is 8), cover with substrate nutrient soil (the covering thickness is less than 1 cm), spray wet and keep the substrate nutrient soil always in a moist state, and then transplant to the strip in February. Apply basal fertilizer to the strip before transplanting, use a rotary tiller to till, and the width of the transplanting area is 50 cm.

[0050] The substrate nutrient soil is: humus soil, peat soil, perlite and vermiculite (volume ratio of 4:2:1:1).

[0051] Experimental example

[0052] The present invention conducts a comprehensive ecological prevention and control test of Diaphorina citri using the method provided in Example 1, and simultaneously conducts multiple control tests. The construction of the isolation net wall is the same, only the selection of nectar source functional plants is different, and the number and reduction ratio of Diaphorina citri on navel orange trees are used as the comparison criteria.

[0053] Control experiment 1: In other areas under the same environment, the scale of the net wall construction is the same as that in Example 1. However, for the nectar-source functional plants inside the net wall, rape is selected, sowing and seedling raising are completed before mid-October, field transplanting is completed before mid-November, and the transplanting width is the same as that in Example 1. The subsequent management is the same as that in Example 1.

[0054] Control experiment 2: In other areas under the same environment, the scale of the net wall construction is the same as that in Example 1. However, for the nectar-source functional plants inside the net wall, cosmos is selected, and it is planted in early March. The planting width is the same as that in Example 1. The subsequent management is the same as that in Example 1.

[0055] Control experiment 3: In other areas under the same environment, an isolation net wall is built separately. The scale of the net wall construction is the same as that in Example 1, but no nectar-source plants are planted inside the net wall.

[0056] Control experiment 4: In other areas under the same environment, no isolation net wall is built and no nectar-source plants are planted.

[0057] The cultivation and management methods in the experimental examples are the same as those in Example 1. The weeds on the orchard ground are regularly cleared in a timely manner to keep the ground weed-free. Investigation on the occurrence of Diaphorina citri: In the navel orange orchards of Example 1 and Control Experiments 1 - 4, 3 strips are selected respectively. For the navel orange trees in the middle of each strip, the east, south, west, and north of the crown of each tree are divided into 4 investigation units. One branch is selected from each investigation unit, and the number of Diaphorina citri on the branch is recorded. Special attention should be paid to carefully searching and counting the new shoot parts. The results show (see Table 1) that compared with the blank control area without isolation net wall and without planting nectar-source plants (Control Experiment 4), the population number of Diaphorina citri has decreased by 60.25% - 89.27% (Table 1). Specifically analyzed, in Control Experiment 3 with only the isolation net wall built, the reduction ratio of the number of Diaphorina citri reaches 60.25%. The isolation net wall has an obvious effect on blocking Diaphorina citri from flying into the net. In fact, during the investigation, the adult Diaphorina citri inside the net are only easily observed during extreme weather such as strong winds; in Example 1 with nectar-source functional plants planted, Control Experiment 1, and Control Experiment 2, the reduction ratios of the number of Diaphorina citri are 89.27%, 67.82%, and 75.08% respectively, which are higher than that in Control Experiment 3. This is mainly because the nectar-source functional plants in the navel orange orchard have the ability to conserve and multiply natural enemies. Especially Cnidium monnieri provides a good shelter for predatory natural enemies, and ladybugs and green lacewings can then transfer to the navel orange trees to prey on adult Diaphorina citri, nymphs, and eggs, enhancing the control effect of natural enemies on Diaphorina citri. Among them, the reduction ratio of Diaphorina citri in Example 1 is the largest, indicating that the ability of Cnidium monnieri to conserve and multiply predatory natural enemies is higher than that of rape and cosmos. The above shows that the method of building an isolation net wall around the navel orange orchard and planting functional plants between the fruit trees in the present invention can effectively prevent and control Diaphorina citri.

[0058] Table 1 Investigation on the number of Diaphorina citri

[0059] Diaphorina citri (head / 100 shoots) Reduction rate (%) Example 1 34 89.27％ Control experiment 1 102 67.82％ Control experiment 2 79 75.08％ Control experiment 3 126 60.25％ Control experiment 4 317 —

[0060] It can be seen that the present invention provides a comprehensive ecological prevention and control method for Diaphorina citri. The comprehensive ecological prevention and control method for Diaphorina citri includes establishing an isolation net wall around the citrus orchard and planting nectar source plants inside the net wall. The net wall is a 40-mesh plastic insect-proof net, which can prevent psyllids from flying into the net. The nectar source functional plant refers to Cnidium monnieri. Planting Cnidium monnieri between fruit trees can conserve and increase natural enemies and enhance the biological control effect of natural enemies on psyllids. The present invention adopts a method combining physical control and biological control, which can effectively reduce the number of Diaphorina citri, relieve the prevention and control pressure, and is of great significance for the ecological regulation of Diaphorina citri and the green development of the navel orange industry.

[0061] Although the above embodiments have described the present invention in detail, they are only a part of the embodiments of the present invention, rather than all embodiments. People can also obtain other embodiments based on these embodiments without creative efforts, and these embodiments all fall within the protection scope of the present invention.

Claims

1. A comprehensive ecological control method for citrus psyllids, characterized in that: It includes building a fence around the citrus grove and planting nectar plants within the fence; The nectar source plants include Cnidium monnieri.

2. The integrated ecological control method for citrus psyllid according to claim 1, characterized in that: The said establishment of the isolation network wall comprises the following steps: A column is set every 5 meters around the citrus orchard, an insect-proof net is fixed on the column, and the top of the insect-proof net is set into a sleeve structure. The lower part of the insect-proof net is compacted with soil, and an entrance and exit door is reserved on one side of the insect-proof net to obtain the isolation net wall.

3. The integrated ecological control method for citrus psyllid according to claim 2, characterized in that: The mesh number of the insect-proof net is 40 meshes; the construction height of the insect-proof net is 5m.

4. The integrated ecological control method for citrus psyllid according to claim 2, characterized in that: The method comprises sewing the top of the insect-proof net into a sleeve structure, wherein the pressing line and the foot line are made of steel wire, and the pressing line is passed through the sleeve and fixed on the column; The width of the entrance door is not less than 130 cm.

5. The integrated ecological control method for citrus psyllid according to claim 1, characterized in that: The planting method of the nectar source plant includes field sowing and / or indoor seedling raising and then transplanting.

6. The integrated ecological control method for citrus psyllid according to claim 5, characterized in that: The field sowing comprises the following steps: After applying base fertilizer to the plot, the soil is rotary tilled and loosened to form a cnidium monnieri planting belt. Cnidium monnieri seeds are sprinkled into the cnidium monnieri planting belt, and then soil is covered and watered until the soil moisture content is not less than 50%.

7. The integrated ecological control method for citrus psyllid according to claim 6, characterized in that: The width of the cnidium monnieri planting belt is 40 to 60 cm; the depth of the rotary tillage and loosening soil is 15 to 25 cm.

8. The method for comprehensive ecological control of citrus psyllid according to claim 6, characterized in that: Before sowing the cnidium monnieri seeds, the method further includes soaking the cnidium monnieri seeds in water, and mixing the soaked cnidium monnieri seeds with soil; The soaking time is 22 to 26 hours; the volume ratio of the soaked cnidium monnieri seeds to the soil is 1:1; the dosage of the cnidium monnieri seeds is 1.3 to 1.7 kg / mu; and the thickness of the covering soil is less than 1 cm.

9. The integrated ecological control method for citrus psyllid according to claim 6, characterized in that: The indoor seedling raising and transplanting comprises the following steps: Water the hole tray until it is soaked, place the cnidium monnieri seeds in the holes and cover them with soil to keep the substrate nutrient soil moist. In February, transplant the cnidium monnieri seedlings to the cnidium monnieri planting area.

10. The integrated ecological control method for citrus psyllid according to claim 9, characterized in that: The matrix nutrient soil includes humus, peat, perlite and vermiculite; the volume ratio of the humus, peat, perlite and vermiculite is 4:2:1:1; The number of Cnidium monnieri seeds placed in each hole is 3 to 8; and the thickness of the covering soil is less than 1 cm.