Method for comprehensively preventing and treating citrus canker and citrus panonychus citri

Abstract

The invention discloses a method for comprehensively preventing and treating citrus canker and citrus panonychus citri, and relates to the technical field of citrus pest control. The specific prevention and control method comprises the following steps: carrying out unmanned aerial vehicle flight prevention once every month by adopting an oil-manganese-copper mixed pesticide in 1-2cm of spring buds of orange trees or 2-3 months before picking orange fruits or at the early stage of red spider mite occurrence of the orange trees; the oil-manganese-copper mixed medicament is mainly prepared from the following raw materials: plant essential oil, mineral oil missible oil, copper hydroxide wettable powder and mancozeb wettable powder in a weight ratio of (0.5-1): (1-2.5): (1-2): (2-3), according to the invention, the problems in the prior art that mineral oil and other medicaments are mixed for preventing and treating citrus canker and citrus panonychus citri are easy to cause phytotoxicity are solved, not only can efficient and lasting prevention and treatment be realized, but also phytotoxicity caused by sudden weather change or improper use can be prevented, and meanwhile, the appearance quality of fruits can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of citrus pest control, and in particular to a method for comprehensively controlling citrus canker and citrus panonychus mites. Background Art

[0002] In recent years, Panonychus citri (commonly known as red spider) and citrus canker (a bacterial disease caused by Xanthomonas campestris pv. citri) have become one of the main pests and diseases of citrus fruit trees in the south, and are the types with the largest amount of pesticides used in the prevention and control of pests and diseases in Wogan. Citrus red spider has the characteristics of omnivorous diet, wide host range, strong reproductive capacity, fast development speed, and short cycle. It can produce 25 generations in Guangxi in one year. The characteristics of citrus canker such as wide transmission routes, rapid infection and difficulty in prevention and control seriously threaten the green and high-quality development of Guangxi's citrus industry. There are many mountainous areas in Guangxi's citrus planting areas with complex terrain. In addition, the aging of the labor force, high labor costs, backward production technology and equipment, low management level, and inefficient pest and disease control have seriously restricted the development of the industry. Therefore, it is urgent to explore a new technology and new methods to alleviate labor shortages, improve pest and disease management, and reduce costs and increase efficiency.

[0003] Regarding the integrated prevention and control methods of citrus canker and citrus panonychus mites, the applicant has conducted in-depth research (Liu Jimin et al. Research on cost-reduction and efficiency-enhancing technology for the combined treatment of citrus canker and citrus panonychus mites in Guangxi production areas [J]. Fruit Trees in Southern China, 2024, 53(4): 31-36), and found in the research that: based on the weight ratio, the use of oil-manganese-copper mixed agent (mineral oil emulsifiable concentrate: copper hydroxide wettable powder: mancozeb wettable powder = 5:1:2) for aerial spraying can reduce the amount of agent used by 30%, and can ensure the control effect, that is, the control effect on citrus red spider mites can reach up to 97.71%, and the control effect on citrus canker can reach 98.57%, achieving the "one high and three reduction" effect, that is, high control efficiency (10×667m2 per hour), reduced water consumption (94%), reduced labor costs (33.33%), and reduced pesticide costs (37.5%). Although the above research has a good effect, the applicant also found that the temperature in most parts of Guangxi has begun to rise in March, and has risen rapidly since April. In June and July, the temperature can exceed 30°C. When using the oil-manganese-copper mixed agent of the above scheme, mineral oil will form a dense protective oil film on the citrus leaves. This oil film will increase the surface temperature of the citrus leaves, which is easy to cause phytotoxicity to the leaves, especially when new buds are used. If the pesticide is improperly applied or the temperature rises suddenly, it is easier to burn the new buds. (The improper application of pesticides here mainly refers to the purchase of bad mineral oil. The quality of mineral oil products on the market is uneven, which is more likely to cause high-temperature burns.) At the same time, if the pesticide is affected by the external environment during application, such as improper application of mineral oil when mixed with other drugs or encountering rain after use, drug spots may form on the surface of the fruit, affecting the commerciality of the fruit. In addition, mineral oil is easy to oxidize, especially under light conditions, oxidation is more rapid, resulting in the potential risk of acute pesticide damage after spraying mineral oil. There are also many reports in the prior art about the use of mineral oil mixed with other drugs leading to pesticide damage, many of which only focus on the prevention and control effect while ignoring the impact of the application of pesticides on citrus itself.

[0004] Therefore, the object of the present invention is to provide a method for comprehensively preventing and controlling citrus canker and citrus mites. Summary of the invention

[0005] In view of the above shortcomings, the present invention provides a method for comprehensively preventing and controlling citrus canker and citrus mites, which solves the problem that the use of mineral oil mixed with other agents to prevent and control citrus canker and citrus mites in the prior art is prone to phytotoxicity. It can not only achieve efficient and long-term prevention and control, but also prevent phytotoxicity caused by sudden weather changes or improper use, and at the same time improve the appearance quality of the fruit. The specific technical scheme is as follows:

[0006] A method for comprehensive prevention and control of citrus canker and citrus panonychus mites, wherein an oil-manganese-copper mixed agent is used for drone flight control once a month when citrus trees sprout 1-2 cm in spring or 2-3 months before citrus fruit picking or at the early stage of citrus red spider mites;

[0007] The oil manganese copper mixed agent is mainly composed of the following raw materials in weight ratio:

[0008] Plant essential oil: mineral oil emulsifiable concentrate: copper hydroxide wettable powder: mancozeb wettable powder = (0.5-1): (1-2.5): (1-2): (2-3).

[0009] Preferably, the ratio of the plant essential oil: mineral oil emulsifiable concentrate: copper hydroxide wettable powder: mancozeb wettable powder is 0.5:2.5:1:2.

[0010] Preferably, the plant essential oil comprises the following raw materials in parts by weight: 20-30 parts of thyme essential oil, 18-27 parts of tea tree essential oil and 7-15 parts of eucalyptus essential oil.

[0011] Preferably, the oil-manganese-copper mixed agent is used in an amount of 600-1300 g / mu each time.

[0012] Preferably, the UAV is the Jimu EA-30XP agricultural UAV; the flight control parameters are a height of 4-4.5m, a speed of 2.5-3.5m / s, and a row spacing of 3-4m.

[0013] Preferably, an auxiliary agent can be added to the oil-manganese-copper mixed agent for each aerial defense and applied together, and the auxiliary agent includes the following raw materials in parts by weight: 10-25 parts of proline and 1-8 parts of glutamine.

[0014] Preferably, the amount of the auxiliary agent added is 0.2-0.8% by weight of the oil-manganese-copper mixed agent.

[0015] Preferably, each time the aerial spraying is carried out, avermectin and fluazifop-butyl can be added to the oil-manganese-copper mixed agent and applied together.

[0016] Preferably, the application amount of avermectin is 175-250 ml / mu, and the application amount of fluazifop is 6-8 g / mu.

[0017] Preferably, the integrated prevention and control further comprises planting nectar plants in the citrus orchard, wherein the nectar plants are one or more of ageratum, clover and calendula.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present invention adopts volatile plant essential oil to replace part of mineral oil, and then mixes it with copper hydroxide wettable powder and mancozeb wettable powder for use, and uses auxiliary agents, avermectin, fluazifop and technical measures such as planting nectar plants in citrus orchards, so as to achieve efficient and lasting prevention and control of citrus canker and citrus panonychus mites, and the prevention and control effect of citrus red spider mites can reach as high as 97.6% or more, and the prevention and control effect of citrus canker is more than 98.4%, which is basically equivalent to or slightly higher than the prevention and control effect of previous studies, and can also prevent the occurrence of drug damage caused by sudden weather changes or improper use, and at the same time can improve the appearance quality of fruits and improve the commercial value of fruits.

[0020] 2. The plant essential oils of the present invention include thyme essential oil, tea tree essential oil and eucalyptus essential oil. These essential oils are volatile and have repellent and fumigation activity on citrus mites. They also have antibacterial effects and have certain preventive and therapeutic effects on citrus mites and citrus canker. They can replace part of the mineral oils, reduce the film thickness of the mineral oils on the citrus leaves, and prevent the leaves from being burned due to excessive temperature rise. At the same time, as the plant essential oils continue to volatilize, the density of the mineral oil film is reduced, so that the leaves can be quickly ventilated and cooled. , will not affect the physiological functions of citrus such as respiration and transpiration for a long time, thereby preventing the occurrence of pesticide damage. Due to the joint action of plant essential oil, mineral oil, avermectin and fluazifop, even if the density of the mineral oil film covering the pests becomes lower, the pests can be killed well. Even if the density of the mineral oil film covering the leaves becomes lower, the invasion of pathogens can be well blocked. In addition, the plant essential oil of the present invention has an antioxidant effect, which can prevent the oxidation of mineral oil, further reducing the occurrence of acute pesticide damage.

[0021] 3. The thyme essential oil, tea tree essential oil, eucalyptus essential oil and mineral oil in the present invention have a synergistic effect, and their combined use can improve the preventive effect on citrus panonychus mites and citrus canker.

[0022] 4. The adjuvant of the present invention includes proline and glutamine. Proline can maintain the water balance of leaf cells, reduce leaf damage caused by high temperature, and further help prevent the occurrence of drug damage. The combination of proline and glutamine can also enhance the stability of cell walls, prevent deformities or drug spots on the peel, keep the peel smooth and evenly colored, and improve the appearance quality of the fruit.

[0023] 5. The present invention carries out grass cultivation in the citrus orchard, that is, planting nectar plants, which can improve the soil structure of the citrus orchard, increase soil fertility, promote the growth and development of citrus, and improve the quality of fruit. At the same time, it can protect and utilize natural enemies, and has a positive protective effect on the ecological environment. DETAILED DESCRIPTION

[0024] The specific embodiments of the present invention are described in detail below, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.

[0025] The copper hydroxide wettable powder, mancozeb wettable powder and avermectin used in the following examples and comparative examples are all produced by Triang Chemical Co., Ltd. of the United States (domestic agent of Shandong Jiaqi Biotechnology Co., Ltd.); bisulflufen is produced by Jiangsu Yangnong Chemical Co., Ltd.;

[0026] Except for Comparative Examples 8 and 9, the mineral oils used in other embodiments and comparative examples were all produced by Triang Chemical Co., Ltd. of the United States (domestic agent of Shandong Jiaqi Biotechnology Co., Ltd.);

[0027] The plant essential oils used in the following examples and comparative examples are all produced by Jiangxi Baicao Pharmaceutical Co., Ltd.; the adjuvants are all produced by Hebei Hongtao Bioengineering Co., Ltd.; and the drones are produced by Suzhou Jimu Robotics Technology Co., Ltd.

[0028] Example 1

[0029] The method for comprehensive prevention and control of citrus canker and citrus panonychus mites in this embodiment is: 3 months before the citrus fruit is picked, use oil manganese copper mixed agent, auxiliary agent, avermectin and flumetofen once a month for drone flight control, wherein the oil manganese copper mixed agent ratio is: plant essential oil: mineral oil emulsifiable concentrate: copper hydroxide wettable powder: mancozeb wettable powder = 0.5:2.5:1:2, plant essential oil is 25 parts of thyme essential oil, 22 parts of tea tree essential oil and 11 parts of eucalyptus essential oil; auxiliary agent includes 19 parts of proline and 5 parts of glutamine. The drone used is the Jimu EA-30XP agricultural drone, and the flight control parameters are: height 4m, speed 2.5m / s, row spacing 3m. And plant nectar plants in the citrus orchard: ageratum, clover and calendula.

[0030] The dosage of each application is shown in Table 1:

[0031] Drug Name Amount per mu Dilution times 99% mineral oil emulsion 375mL 40 77% copper hydroxide wettable powder 150g 100 80% Mancozeb WP 300g 50 Essential Oils 75mL 200 Auxiliary agents 1.8g - Avermectin 1.8% 200mL 75 Cyproconazole 15% 7.5g 2000

[0032] Example 2

[0033] The method for comprehensive prevention and control of citrus canker and citrus panonychus mites in this embodiment is: 3 months before the citrus fruit is picked, use oil manganese copper mixed agent, auxiliary agent, avermectin and fluazifop diether for drone flight control once a month, wherein the oil manganese copper mixed agent ratio is: plant essential oil: mineral oil emulsifiable concentrate: copper hydroxide wettable powder: mancozeb wettable powder = 1:1:1:2, plant essential oil is 30 parts of thyme essential oil, 27 parts of tea tree essential oil and 15 parts of eucalyptus essential oil; auxiliary agent includes 25 parts of proline and 8 parts of glutamine. The drone used is the Jimu EA-30XP agricultural drone, and the flight control parameters are: height 4.5m, speed 3.5m / s, row spacing 4m. And plant nectar plants: ageratum and clover in the citrus orchard.

[0034] The dosage of each application is shown in Table 2:

[0035] Drug Name Amount per mu Dilution times 99% mineral oil emulsion 150mL 100 77% copper hydroxide wettable powder 150g 100 80% Mancozeb WP 300g 50 Essential Oils 150mL 100 Auxiliary agents 6g - Avermectin 1.8% 250mL 60 Cyproconazole 15% 6g 2500

[0036] Example 3

[0037] The method for comprehensive prevention and control of citrus canker and citrus panonychus mites in this embodiment is: 2 months before the citrus fruits are picked, a mixture of manganese copper oil, auxiliary agents, avermectin and flumetofen are used for drone flight control once a month (in other embodiments, it can also be carried out once a month when the citrus trees are 1-2 cm in spring buds or when the citrus trees are red spider mites). The ratio of the mixture of manganese copper oil is: plant essential oil: mineral oil emulsifiable concentrate: copper hydroxide wettable powder: mancozeb wettable powder = 1:2:2:3, and the plant essential oil is 20 parts of thyme essential oil, 18 parts of tea tree essential oil and 7 parts of eucalyptus essential oil; the auxiliary agent includes 10 parts of proline and 1 part of glutamine. The drone used is the Jimu EA-30XP agricultural drone, and the flight control parameters are: height 4.5m, speed 3m / s, and row spacing 4m. And plant nectar plants: ageratum and calendula in the citrus orchard.

[0038] The dosage of each application is shown in Table 3:

[0039]

[0040]

[0041] Comparative Example 1: The method for comprehensive prevention and control of citrus canker and citrus mites in this comparative example is the same as that in Example 3 except that thyme essential oil is not contained. Other agents and methods are the same as those in Example 3.

[0042] Comparative Example 2: The method for comprehensive prevention and control of citrus canker and citrus mites in this comparative example does not contain tea tree essential oil and eucalyptus essential oil. Other agents and methods are the same as those in Example 3.

[0043] Comparative Example 3: The method for comprehensive prevention and control of citrus canker and citrus mites in this comparative example does not contain avermectin, and other agents and methods are the same as those in Example 3.

[0044] Comparative Example 4: The method for comprehensive prevention and control of citrus canker and citrus mites in this comparative example is the same as that in Example 3 except that fluazifop-butyl is not included. Other agents and methods are the same as those in Example 3.

[0045] Comparative Example 5: The method for comprehensive prevention and control of citrus canker and citrus mites in this comparative example is the same as that in Example 3 except that nectar plants are not planted in the citrus orchard.

[0046] Comparative Example 6: The method for comprehensive prevention and control of citrus canker and citrus panonychus mites in this comparative example is the existing technology: the oil manganese copper mixed agent is used for drone flight control once a month from March to November each year, wherein the oil manganese copper mixed agent ratio is: mineral oil emulsifiable concentrate: copper hydroxide wettable powder: mancozeb wettable powder = 5:1:2. The drone used is the Jimu EA-30XP agricultural drone, and the flight control parameters are: height 4.5m, speed 3m / s, row spacing 4m. The amount of pesticide applied each time is shown in Table 4:

[0047] Drug Name Amount per mu Dilution times 99% mineral oil emulsion 750mL 20 77% copper hydroxide wettable powder 150g 100 80% Mancozeb WP 300g 50

[0048] Test time and location: The test will be conducted in 2023 at the 091 seedless Wogan base of Guangxi Jinsui Group Co., Ltd. in Natong Town, Long'an County, Nanning City, Guangxi. The test Wogan (late-maturing variety) is 3 years old, and no pesticides or fungicides were used 20 days before the test.

[0049] Experimental design: The experiment set up 9 treatment areas in total, 5 points were randomly selected in each treatment area, each point was a plot (2 plants), and a total of 10 plants were investigated. Treatment 1 was controlled according to the method of Example 1, treatment 2 was controlled according to the method of Example 2, treatment 3 was controlled according to the method of Example 3, treatment 4 was controlled according to the method of Comparative Example 1, treatment 5 was controlled according to the method of Comparative Example 2, treatment 6 was controlled according to the method of Comparative Example 3, treatment 7 was controlled according to the method of Comparative Example 4, treatment 8 was controlled according to the method of Comparative Example 5; treatment 9 was controlled according to the method of Comparative Example 6. The experiment was isolated by roads and protective rows were set up around it, and there were isolation rows between each treatment. A base survey was conducted before the first application of pesticides. The control results of citrus red spider were investigated once 7-10 days after each application of pesticides. The control results of citrus canker were investigated once 7-10 days after the last application of pesticides, and the number of days lasting were counted. The results are shown in Table 5.

[0050] Investigation and analysis methods of citrus red spider mites:

[0051] Within the scope of the regional test, the five-point sampling method was used for each treatment, with 2 citrus trees surveyed at each point, for a total of 10 trees per treatment; each tree was assigned a tender shoot at each of the five directions of southeast, northwest, and center, for a total of 5 shoots, and the number of live citrus red spider mites on 5 leaves of each shoot was investigated, for a total of 500 leaves per treatment, and the insect population reduction rate and control effect were calculated. Statistical methods:

[0052]

[0053] Investigation and analysis methods of citrus canker:

[0054] While investigating citrus red spider mites, we also conducted an investigation on citrus canker on the same shoot. It is necessary to investigate all leaves on each tender shoot and grade them according to the degree of damage symptoms on the citrus leaves. The leaf grading method refers to the "Fungicide Control of Citrus Canker" in the "Guidelines for Field Efficacy Tests of Pesticides (II)" GB / T17980.103-2004. Leaf grading standards:

[0055] Level 0: no disease;

[0056] Level 1: There are 1 to 5 lesions on each leaf;

[0057] Level 3: 6 to 10 lesions on each leaf;

[0058] Level 5: There are 11 to 15 lesions on each leaf;

[0059] Level 7: 16 to 20 lesions on each leaf;

[0060] Level 9: There are more than 21 spots on each leaf.

[0061] Record and count the number of diseased leaves, disease index and control effects at each level.

[0062] Calculation method of citrus canker prevention effect:

[0063] The disease index is calculated according to the following formula

[0064]

[0065] The base number of investigation before application is 0, and the control effect is calculated as follows:

[0066]

[0067] Where: CK1—disease index of blank control area after application;

[0068] PT1—Disease index after application of pesticide in the treatment area.

[0069] Before applying the pesticide, use the following formula to calculate the control effect:

[0070]

[0071] Where: CK-blank control area before drug application disease index; PT-drug treatment area before drug application disease index.

[0072] CK1-disease index of blank control area after application of pesticides; PT1-disease index of drug-treated area after application of pesticides.

[0073] Table 5 Control effect of each treatment

[0074]

[0075] Note: The red spider control effect in this table only counts the month with the highest control effect (May).

[0076] The data of the examples in Table 5 show that the control effect of the method of the present invention on citrus red spider mites can reach up to 97.6% or more, and the control effect on citrus canker is 98.4% or more. The data of the examples and comparative example 5 show that the control effect of the method of the present invention on citrus red spider mites and citrus canker is basically equivalent to or slightly higher than that of the prior art method. The data of Example 3 and Comparative Examples 1 to 4 show that the thyme essence, tea tree essential oil, and eucalyptus essential oil in the plant essential oils of the present invention have a synergistic effect, and the combined effect of the oil manganese copper mixed agent, avermectin, fluazifop, and the planting of nectar plants in the citrus orchard can achieve efficient and lasting control of citrus canker and citrus panonychus mites.

[0077] Comparative Example 6: The method for comprehensive prevention and control of citrus canker and citrus mites in this comparative example is the same as that in Example 3 except that the auxiliary agent does not contain proline. Other agents and methods are the same as those in Example 3.

[0078] Comparative Example 7: The method for comprehensive prevention and control of citrus canker and citrus mites in this comparative example is the same as that in Example 3 except that the auxiliary agent does not contain glutamine. Other agents and methods are the same as those in Example 3.

[0079] Comparative Example 8: The mineral oil in the method for comprehensive prevention and control of citrus canker and citrus panonychus mites in this comparative example is produced by Beijing Zhongbao Green Agriculture Technology Group Co., Ltd., and other agents and methods are the same as those in Example 3.

[0080] Comparative Example 9: The mineral oil in the method for comprehensive prevention and control of citrus canker and citrus panonychus mites in this comparative example is produced by Beijing Zhongbao Green Agriculture Technology Group Co., Ltd., and other agents and methods are the same as those in Comparative Example 5 (prior art).

[0081] In July, the citrus fruits of each embodiment and comparative example 1, comparative example 2, comparative example 6 to comparative example 9 were observed for phytotoxicity 7-10 days after the application of the pesticide, and the appearance of the fruits was observed during the fruit ripening period. The results are shown in Table 6:

[0082] Table 6: Phytotoxicity and fruit appearance of each group

[0083] Category / Project Is there any drug damage? Appearance Example 1 none The skin is smooth and evenly colored Example 2 none The skin is smooth and evenly colored Example 3 none The skin is smooth and evenly colored Comparative Example 1 have Spots or streaks on the skin Comparative Example 2 have Spots or streaks on the skin Comparative Example 6 have Spots or streaks on the skin Comparative Example 7 have Spots or streaks on the skin Comparative Example 8 none The skin is smooth and evenly colored Comparative Example 9 have Spots or streaks on the skin

[0084] The above table shows that the plant essential oils and the proline and glutamine in the adjuvants of the present invention can prevent the occurrence of phytotoxicity and make the fruit appearance quality good. At the same time, from the comparison between Comparative Example 8 and the embodiment, it is found that even if the mineral oil produced by the American Triang Chemical Co., Ltd. is not used, the drug use of the present invention will not cause phytotoxicity. From the comparison between Comparative Example 9 and the embodiment, it is found that in the prior art solution, if the mineral oil produced by the American Triang Chemical Co., Ltd. is not used, phytotoxicity will occur.

[0085] In summary, the present invention adopts volatile plant essential oil to replace part of mineral oil and mixes with copper hydroxide wettable powder and mancozeb wettable powder for use, and uses auxiliary agents, avermectin, fluazifop and technical measures such as planting nectar plants in citrus orchards, so as to achieve efficient and lasting prevention and control of citrus canker and citrus panonychus mites, and the prevention and control effect on citrus red spider mites can reach as high as 97.6% or more, and the prevention and control effect on citrus canker is more than 98.4%, which is basically equivalent to or slightly higher than the prevention and control effect of previous studies, and can also prevent the occurrence of drug damage caused by sudden weather changes or improper use, and at the same time can improve the appearance quality of fruits and improve the commercial value of fruits.

[0086] At the same time, the plant essential oil of the present invention is volatile, and has a repellent effect and fumigation activity on citrus mites, and also has an antibacterial effect, and has a certain prevention and control effect on citrus mites and citrus canker. It can replace part of the mineral oil, reduce the film thickness of the mineral oil on the citrus leaves, and prevent the leaves from being burned due to excessive temperature rise. At the same time, with the continuous volatilization of the plant essential oil, the density of the mineral oil film is reduced, so that the leaves can be quickly ventilated and cooled, and will not affect the physiological functions of citrus such as respiration and transpiration for a long time, thereby preventing the occurrence of drug damage. Due to the joint action of the plant essential oil, mineral oil, avermectin and fluazifop, even if the density of the mineral oil film covering the pests becomes low, the pests can be killed well, and even if the density of the mineral oil film covering the leaves becomes low, the invasion of pathogens can be well blocked. In addition, the plant essential oil of the present invention has an antioxidant effect, can prevent the oxidation of the mineral oil, and further reduce the occurrence of acute drug damage. The thyme essential oil, tea tree essential oil, eucalyptus essential oil and mineral oil in the invention have a synergistic effect and can improve the prevention effect on citrus panonychus mites and citrus canker when used together.

[0087] The proline in the adjuvant of the present invention can maintain the water balance of leaf cells, reduce the leaf damage caused by high temperature, and further help prevent the occurrence of drug damage. The combination of proline and glutamine can also enhance the stability of cell walls, prevent deformities or drug spots on the fruit peel, keep the fruit peel smooth and evenly colored, and improve the appearance quality of the fruit.

[0088] The foregoing description of specific exemplary embodiments of the present invention is for the purpose of illustration and demonstration. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the present invention and various different selections and changes. The scope of the present invention is intended to be limited by the claims and their equivalents.

Claims

1. A method for comprehensive prevention and control of citrus canker and citrus mites, characterized in that: When the spring buds of citrus trees are 1-2 cm long, or 2-3 months before the citrus fruits are picked, or when red spider mites occur in citrus trees, use a mixture of oil, manganese and copper to carry out drone spraying once a month; The oil manganese copper mixed agent is mainly composed of the following raw materials in weight ratio: Plant essential oil: mineral oil emulsifiable concentrate: copper hydroxide wettable powder: mancozeb wettable powder = (0.5-1): (1-2.5): (1-2): (2-3).

2. The method for comprehensive prevention and control of citrus canker and citrus mites according to claim 1, characterized in that: The ratio of the plant essential oil: mineral oil emulsifiable concentrate: copper hydroxide wettable powder: mancozeb wettable powder is 0.5:2.5:1:

2.

3. The method for comprehensive prevention and control of citrus canker and citrus mites according to claim 1, characterized in that: The plant essential oil comprises the following raw materials in parts by weight: 20-30 parts of thyme essential oil, 18-27 parts of tea tree essential oil and 7-15 parts of eucalyptus essential oil.

4. The method for comprehensive prevention and control of citrus canker and citrus mites according to claim 1, characterized in that: The oil-manganese-copper mixed agent is used in an amount of 600-1300 g / mu each time.

5. The method for comprehensive prevention and control of citrus canker and citrus mites according to claim 1, characterized in that: The drone is the Jimu EA-30XP agricultural drone; the flight control parameters are a height of 4-4.5m, a speed of 2.5-3.5m / s, and a row spacing of 3-4m.

6. The method for comprehensive prevention and control of citrus canker and citrus mites according to claim 1, characterized in that: Each time the spraying is carried out, an auxiliary agent can be added to the oil-manganese-copper mixed agent and applied together. The auxiliary agent includes the following raw materials in parts by weight: 10-25 parts of proline and 1-8 parts of glutamine.

7. The method for comprehensive prevention and control of citrus canker and citrus mites according to claim 6, characterized in that: The amount of the auxiliary agent added is 0.2-0.8% of the weight of the oil-manganese-copper mixed agent.

8. The method for comprehensive prevention and control of citrus canker and citrus mites according to claim 1, characterized in that: Each time the aerial spraying is carried out, avermectin and fluazifop-butyl can be added to the oil-manganese-copper mixed agent and applied together.

9. The method for comprehensive prevention and control of citrus canker and citrus mites according to claim 8, characterized in that: The application amount of avermectin is 175-250 ml / mu, and the application amount of fluazifop is 6-9 g / mu.

10. The method for comprehensive prevention and control of citrus canker and citrus mites according to claim 1, characterized in that: The integrated prevention and control also includes planting nectar plants in the citrus orchard, wherein the nectar plants are one or more of ageratum, clover and calendula.

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