Citrus canker control method

Abstract

The invention belongs to the technical field of citrus disease control, and particularly relates to a citrus canker control method which comprises the following steps: S1, pruning fruit trees, and pruning and removing branches, leaves and diseased fruits with citrus canker symptoms; s2, a film covering support is built at the tops of the citrus fruit trees in the citrus planting area; s3, 200-fold mineral oil liquid is sprayed in the early stage of citrus sprouting, spraying is conducted once in each sprouting period, and spraying is conducted for four times in total. According to the method, the problems existing in the existing citrus canker prevention and treatment by using a copper preparation are solved, the actual situation in the citrus planting process is combined, the method of spraying mineral oil to fruit trees and covering the tops of the fruit trees with rainproof films is adopted, the prevention and treatment effect is good, and the method belongs to a pest and disease damage green prevention and treatment method, does not damage natural enemies in the nature, is friendly to the ecological environment and has good economic benefits. The method is green and environment-friendly, and especially has important significance on production of green fruits or organic fruits.

Description

Technical Field

[0001] The invention belongs to the technical field of citrus disease prevention and control, and particularly relates to a method for preventing and controlling citrus canker. Background Art

[0002] Citrus canker is an extremely destructive bacterial disease in citrus production, which has a great impact on the growth of citrus trees and the commercial value of the fruit. In mild cases, it harms leaves and tender branches, affecting photosynthesis, causing the citrus trees to weaken and severely reducing production; in severe cases, it also harms citrus fruits, seriously affecting the appearance of the fruit and making it difficult to sell.

[0003] In the past, citrus canker was primarily controlled by spraying copper preparations, requiring more than 12 applications per year. However, the canker pathogen is resilient and highly capable of reproduction and transmission, easily spreading through waterways and causing widespread infection. Long-term, single-use fungicides such as copper preparations (Bordeaux mixture, copper hydroxide) can lead to the development of resistance and reduced efficacy. To prevent pesticide residues near harvest, the use of chemical pesticides must be reduced or eliminated. However, high temperatures and humidity during this time can rapidly spread the disease. Some producers have tried using mineral oil alone to prevent citrus canker, but this has not only been repeated frequently but also been ineffective and prone to causing damage to the pesticide or fruit.

[0004] The prevention and control of citrus canker has become a major problem in citrus cultivation. After years of research and experiments, the inventors have discovered a new method for preventing and controlling citrus canker: applying mineral oil to fruit trees combined with covering the tops of the fruit trees to prevent and control citrus canker. This method has good prevention and control effects, is friendly to the ecological environment, and is green and environmentally friendly. It is especially important for the production of green fruits or organic fruits. Summary of the Invention

[0005] The purpose of the present invention is to provide a method for preventing and controlling citrus canker, which adopts the method of applying mineral oil to fruit trees in combination with covering film on the top of fruit trees to prevent and control citrus canker. The method has good prevention and control effect, is friendly to the ecological environment, is green and environmentally friendly, and is of great significance to the production of green fruits or organic fruits.

[0006] To achieve the above object, the present invention provides the following technical solutions: A method for preventing and treating citrus canker, comprising the following steps: S1. Prune fruit trees and remove branches, leaves, and fruit affected by citrus canker. S2. Build film covering supports on top of citrus trees in the citrus planting area; S3. Spray citrus trees with a 200-fold dilution of mineral oil at the beginning of shoot growth. Apply once at each shoot growth stage for a total of four times. Furthermore, in step S2, the film covering bracket is covered with a rainproof film.

[0007] Furthermore, the width of the rainproof film is greater than the width of the outer drip lines on both sides of the citrus tree, and the height of the rainproof film is not less than 0.3m from the top of the citrus tree.

[0008] Furthermore, in step S3, the time for spraying the liquid medicine is before 10 am or after 5 pm.

[0009] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention is based on solving the problems existing in the existing use of copper preparations to prevent and treat citrus canker. In combination with the actual situation in the citrus planting process, the present invention adopts a method of spraying mineral oil on fruit trees combined with covering the tops of the fruit trees with a rainproof film. The prevention and control effect is good and it is a green pest control method. It does not harm natural enemies, is friendly to the ecological environment, and is green and environmentally friendly. It is of great significance to the production of green fruits or organic fruits.

[0010] (2) The method of the present invention requires a certain amount of investment in the early stage of setting up a frame and covering the film, but the later operation is simple and the annual average investment cost is significantly low.

[0011] (3) The method of the present invention can not only prevent and treat citrus canker, but also significantly reduce the number and degree of sunburn of citrus fruits in the south. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1-2 This is a practical application scenario of the prevention and control method of the present invention in an orchard. DETAILED DESCRIPTION

[0013] The following is a clear and complete description of the technical solution of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making any creative efforts are within the scope of protection of the present invention. Example 1

[0014] See attached Figure 1-2 The method for preventing and treating citrus canker of the present invention was implemented in the Wogan orchard in Wuming District, Nanning City, Guangxi Province, as follows: S1. Reduce the number of pathogenic factors: After harvesting Wogan fruit, combine fruit tree pruning with pruning branches (including leaves) and fruit with a high incidence of citrus canker lesions. Collect fallen citrus canker-infected fruit and dispose of it harmlessly. S2. Build a film covering support on top of the Wogan trees in the Wogan planting area. The width of the film covering support should be larger than the outermost drip line on both sides of the citrus tree, and the height should be about 0.3 meters higher than the tree crown (e.g. Figure 1 and 2 As shown, the bracket construction method can be changed according to the orchard terrain). After the bracket is built, it is covered with a rainproof film. S3. During the early stages of Wogan shoot growth, before young leaves unfold, especially during the spring, summer, and autumn shoot stages, spray 200x diluted mineral oil evenly, covering all parts of the tree, including the undersides of leaves and branches, with a focus on young shoots and leaves. Apply once per shoot, four times per year. Spray before 10:00 AM or after 5:00 PM. Use 99% mineral oil emulsifiable concentrate (Telianger Maizen) produced by Triang Chemical Co., Ltd. in the United States.

[0015] To validate the effectiveness of this method, a control treatment was included in this experiment. Control efficacy analysis was conducted in accordance with "GB / T 17980.103-2004, Guidelines for Field Efficacy Tests of Pesticides (II), Part 103: Guidelines for Field Efficacy Tests of Fungicides for the Control of Citrus Canker." The conventional control and blank control plots were located in the same orchard, 10 rows apart. 84% Copper Oxychloride Water-Dispersible Granules (Shyam Chemicals Ltd., India) were sprayed at a concentration of 1000x. Application was made at the early stage of shoot emergence, ensuring that leaves and fruit were evenly and thoroughly moistened without dripping. Two applications were applied to each shoot, with a 10-day interval. Twenty days after the final application, disease indexes of diseased leaves and fruit at each disease level were measured. Control efficacy was then evaluated over three shoot periods (spring, summer, and autumn). Annual control efficacy was evaluated using the average disease index and control efficacy over these three shoot periods.

[0016] Leaf (fruit) grading method: Level 0: no disease; Level 1: There are 1-5 lesions on each leaf (fruit); Level 3: There are 6-10 lesions on each leaf (fruit); Level 5: There are 11-15 lesions on each leaf (fruit); Level 7: There are 16-20 lesions on each leaf (fruit); Level 9: There are more than 21 spots on each leaf (fruit).

[0017]

[0018]

[0019] Table 1 Results of the citrus canker control experiment deal with Average disease index Average control effect (%) Control method of the present invention 0.82 90.36 Conventional control treatment (84% copper oxychloride water dispersible granules) 2.43 70.45 Blank control 8.26 —— As shown in Table 1, the method of the present invention is more effective in controlling citrus canker than the control treatment, reducing the number of pesticide applications by six and significantly saving manpower and pesticide costs. This demonstrates that the method of the present invention is reliable, environmentally friendly, and reduces control costs, making it worthy of promotion and application in production.

[0020] The foregoing descriptions of specific exemplary embodiments of the present invention are for purposes of illustration and description. These descriptions are not intended to limit the invention to the precise forms disclosed, and it is apparent that many variations and modifications are possible in light of the foregoing teachings. The exemplary embodiments have been selected and described for the purpose of explaining the specific principles of the invention and their practical application, thereby enabling those skilled in the art to realize and utilize a variety of exemplary embodiments of the invention and various options and modifications. The scope of the invention is intended to be defined by the claims and their equivalents.

Claims

1. A method for preventing and treating citrus canker, characterized in that: The following steps are involved: S1. Prune fruit trees and remove branches, leaves, and fruit affected by citrus canker. S2. Build film covering supports on top of citrus trees in the citrus planting area; S3. Spray 200 times diluted mineral oil at the early stage of citrus shoot emergence, spray once at each shoot stage, and spray a total of 4 times.

2. The method for preventing and treating citrus canker according to claim 1, wherein: In step S2, the film covering bracket is covered with a rainproof film.

3. The method for preventing and treating citrus canker according to claim 2, wherein: The width of the film covering support is greater than the width of the drip lines on both sides of the citrus tree, and the height of the film covering support is not less than 0.3m from the top of the citrus tree.

4. The method for preventing and treating citrus canker according to claim 1, wherein: In step S3, the time for spraying the liquid medicine is before 10 am or after 5 pm.

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