Method for increasing parasitized rate of apolygus lucorum in cotton field

Abstract

The invention relates to a method for increasing the parasitized rate of apolygus lucorum in a cotton field. Buckwheat is intercropped in the cotton field in a strip-sowing mode. According to the method for removing the apolygus lucorum, the buckwheat is intercropped in the cotton field, parasitic-wasp population establishment is promoted, and therefore the apolygus-lucorum-nymph parasitism rate of parasitic wasps is increased; occurrence of apolygus-lucorum populations is naturally controlled, pesticide does not need to be applied, and overmuch manual control is not required; the method is environmentally friendly, easy to operate and remarkable in pest removing effect.

Description

technical field

[0001] The invention belongs to the field of green prevention and control of agricultural pests, and in particular relates to a method for increasing the parasitization rate of Lygus nymphs in cotton fields by intercropping buckwheat and naturally controlling the Lygus. Background technique

[0002] The green mirid bug Apolygus lucorum (Meyer-Dür) belongs to the family Miridae of Hemiptera, and has good flying dispersal ability. For a long time, Lygus aeruginosa has always been a secondary pest in cotton fields, and it has been used as an object of chemical control of major pests such as cotton bollworm. However, with the large-scale popularization of insect-resistant Bt cotton, the occurrence of Lygus aeruginosa became more and more serious, and it gradually became the main pest in cotton fields. In recent years, the loss of cotton yield due to the damage of Lygus often reaches 20-30%, and in severe areas it reaches 50%. Adults and nymphs of Lygus japonica...

Examples

Embodiment 1

[0021] Test site: Langfang Pilot Test Base of Institute of Plant Protection, Chinese Academy of Agricultural Sciences.

[0022] Select a type of experimental field in the base, plant cotton in it, and sow buckwheat in the form of drill intercropping 35 days after cotton sowing, control the width of each cotton belt to 30m, and the distance between adjacent cotton belts to 4m, each buckwheat The width of the belt is 2m, and the distance between the buckwheat belt and the adjacent cotton belt is 1m, and then the conventional management is carried out.

experiment example

[0026] Experimental method: In different periods of cotton growth, the nymphs of Lygus japonica on cotton in monocropping field and intercropping field were collected respectively, and the parasitism of two kinds of parasitic wasps, B. spp.

[0027] Experimental results: In both Example 1 and Comparative Example 1, the parasitism rate of the red-necked Braconidus was far higher than that of the commoneria, and it was the dominant species. In the intercropping field Example 1, the parasitic rate of the dominant species of Braconus red-necked nymphs to the nymphs of the green Lygus was 34.69%, which was significantly higher than the parasitic rate of 15.38% in the monocropping field comparative example 1 (χ2=4.194 , df=1, P=0.0406) (see histogram figure 1 ). The overall parasitism rate of Braconis spp. in cotton fields was low, and the parasitism rate to Lygus spp. in intercropping fields was 4.08%, which was slightly higher than that to 2.56% in single-cropping fields. There w...

technical field

[0001] The invention belongs to the field of green prevention and control of agricultural pests, and in particular relates to a method for increasing the parasitization rate of Lygus nymphs in cotton fields by intercropping buckwheat and naturally controlling the Lygus. Background technique

[0002] The green mirid bug Apolygus lucorum (Meyer-Dür) belongs to the family Miridae of Hemiptera, and has good flying dispersal ability. For a long time, Lygus aeruginosa has always been a secondary pest in cotton fields, and it has been used as an object of chemical control of major pests such as cotton bollworm. However, with the large-scale popularization of insect-resistant Bt cotton, the occurrence of Lygus aeruginosa became more and more serious, and it gradually became the main pest in cotton fields. In recent years, the loss of cotton yield due to the damage of Lygus often reaches 20-30%, and in severe areas it reaches 50%. Adults and nymphs of Lygus japonica...

Examples

Embodiment 1

[0021] Test site: Langfang Pilot Test Base of Institute of Plant Protection, Chinese Academy of Agricultural Sciences.

[0022] Select a type of experimental field in the base, plant cotton in it, and sow buckwheat in the form of drill intercropping 35 days after cotton sowing, control the width of each cotton belt to 30m, and the distance between adjacent cotton belts to 4m, each buckwheat The width of the belt is 2m, and the distance between the buckwheat belt and the adjacent cotton belt is 1m, and then the conventional management is carried out.

experiment example

[0026] Experimental method: In different periods of cotton growth, the nymphs of Lygus japonica on cotton in monocropping field and intercropping field were collected respectively, and the parasitism of two kinds of parasitic wasps, B. spp.

[0027] Experimental results: In both Example 1 and Comparative Example 1, the parasitism rate of the red-necked Braconidus was far higher than that of the commoneria, and it was the dominant species. In the intercropping field Example 1, the parasitic rate of the dominant species of Braconus red-necked nymphs to the nymphs of the green Lygus was 34.69%, which was significantly higher than the parasitic rate of 15.38% in the monocropping field comparative example 1 (χ2=4.194 , df=1, P=0.0406) (see histogram figure 1 ). The overall parasitism rate of Braconis spp. in cotton fields was low, and the parasitism rate to Lygus spp. in intercropping fields was 4.08%, which was slightly higher than that to 2.56% in single-cropping fields. There w...

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