A control method for citrus huanglongbing of fruit-bearing citrus trees

Abstract

The invention belongs to the technical field of plant disease and insect pest control, and particularly discloses a method for preventing the citrus tristeza virus. The method is especially suitable for preventing the citrus tristeza virus of fruit bearing production type citrus trees. According to the method, through special management of spring shoots, summer shoots, early and late autumn shoots and winter shoots of the citrus trees every year, the food sources and breeding sites of citrus psylla spreading the citrus tristeza virus can be effectively eliminated so that eggs and nymphs can not grow and develop normally, the number of subcultured pest sources is reduced greatly, and then an ideal preventing effect is realized; meanwhile, the usage amount of insecticides can be reduced, natural enemy protection is achieved, and prevention cost is reduced; furthermore, compared with the shoot control scheme, the method has the advantages that the growth of the citrus trees is not affected, and the effect of eliminating the food sources and breeding sites of citrus psylla spreading the citrus tristeza virus is remarkable.

Description

technical field

[0001] The invention relates to the technical field of prevention and control of plant diseases and insect pests, in particular to a method for preventing and treating citrus huanglongbing, and more specifically, to a method for preventing and controlling citrus huanglongbing of fruit-bearing production citrus trees. Background technique

[0002] Citrus huanglongbing, also known as yellow shoot disease, has become one of the key factors restricting the healthy development of citrus industry. Citrus huanglongbing is a systemic disease. There is no way to cure the disease after infection, only to dig out the whole plant, so it is commonly known as "cancer" on citrus. The citrus psyllid is the only vector insect that transmits citrus Huanglongbing. The pathogen of Huanglongbing can reproduce in the psyllid. Both the adults and the 3rd to 5th instar nymphs of the psyllid can transmit the disease. When the infected psyllid feeds on healthy plants, the pathogen pas...

Examples

Embodiment 1

[0022] From 2010 to 2014, a test was carried out in the Qicha citrus orchard in Jiangchuan Town, Fengkai County, Zhaoqing City, Guangdong Province. Before the test, the diseased tree rate of citrus Huanglong disease in the orchard was 20.5%, and the diseased tree rate in the control orchard was 21.8%. The rate of diseased trees was 1.3%, and the rate of diseased trees in the control orchard was 69.6%, and the disease prevention effect was 97.6%. Before the test in 2010, the number of eggs of citrus psyllids in the summer shoot stage in the orchard was an average of 32.1 eggs per bud, and the control orchard was the average. 35.1 grains per bud. After the test, the number of eggs of citrus psyllids in the orchard in 2014 was an average of 0.2 grains per bud, and the control orchard was 40.3 eggs per bud. The insect control effect was 99.5%. The specific method is:

[0023] Erase spring shoots: Spray twice with 6% oxyfluorfen 1300 times in spring, and wipe off the young shoots b...

Embodiment 2

[0028] From 2013 to 2014, a test was carried out in the citrus orchard in Mitsui Village, Nanbeitian, Lianjiangkou Town, Yingde City, Guangdong Province. Before the test, the diseased tree rate of citrus greening disease in the orchard was 16.2%, and the diseased tree rate in the control orchard was 15.5%. The rate of Huanglongbing diseased trees in the orchard was 8.4%, and the rate of diseased trees in the control orchard was 30.5%, and the disease prevention effect was 72.5%. The average egg count of citrus psyllids in the orchard in 2014 was 32.1 eggs per shoot, and the average egg count of the control orchard was 44.1 eggs per shoot in 2014. The insect control effect was 69.2%. The specific method is:

[0029] Erase summer shoots: Spray four times with 6% oxyfluorfen 1300~1500 times in summer to wipe off summer shoots less than 3cm in length; The two pesticides were used alternately once at normal doses.

technical field

[0001] The invention relates to the technical field of prevention and control of plant diseases and insect pests, in particular to a method for preventing and treating citrus huanglongbing, and more specifically, to a method for preventing and controlling citrus huanglongbing of fruit-bearing production citrus trees. Background technique

[0002] Citrus huanglongbing, also known as yellow shoot disease, has become one of the key factors restricting the healthy development of citrus industry. Citrus huanglongbing is a systemic disease. There is no way to cure the disease after infection, only to dig out the whole plant, so it is commonly known as "cancer" on citrus. The citrus psyllid is the only vector insect that transmits citrus Huanglongbing. The pathogen of Huanglongbing can reproduce in the psyllid. Both the adults and the 3rd to 5th instar nymphs of the psyllid can transmit the disease. When the infected psyllid feeds on healthy plants, the pathogen pas...

Examples

Embodiment 1

[0022] From 2010 to 2014, a test was carried out in the Qicha citrus orchard in Jiangchuan Town, Fengkai County, Zhaoqing City, Guangdong Province. Before the test, the diseased tree rate of citrus Huanglong disease in the orchard was 20.5%, and the diseased tree rate in the control orchard was 21.8%. The rate of diseased trees was 1.3%, and the rate of diseased trees in the control orchard was 69.6%, and the disease prevention effect was 97.6%. Before the test in 2010, the number of eggs of citrus psyllids in the summer shoot stage in the orchard was an average of 32.1 eggs per bud, and the control orchard was the average. 35.1 grains per bud. After the test, the number of eggs of citrus psyllids in the orchard in 2014 was an average of 0.2 grains per bud, and the control orchard was 40.3 eggs per bud. The insect control effect was 99.5%. The specific method is:

[0023] Erase spring shoots: Spray twice with 6% oxyfluorfen 1300 times in spring, and wipe off the young shoots b...

Embodiment 2

[0028] From 2013 to 2014, a test was carried out in the citrus orchard in Mitsui Village, Nanbeitian, Lianjiangkou Town, Yingde City, Guangdong Province. Before the test, the diseased tree rate of citrus greening disease in the orchard was 16.2%, and the diseased tree rate in the control orchard was 15.5%. The rate of Huanglongbing diseased trees in the orchard was 8.4%, and the rate of diseased trees in the control orchard was 30.5%, and the disease prevention effect was 72.5%. The average egg count of citrus psyllids in the orchard in 2014 was 32.1 eggs per shoot, and the average egg count of the control orchard was 44.1 eggs per shoot in 2014. The insect control effect was 69.2%. The specific method is:

[0029] Erase summer shoots: Spray four times with 6% oxyfluorfen 1300~1500 times in summer to wipe off summer shoots less than 3cm in length; The two pesticides were used alternately once at normal doses.

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