Green prevention and control method for sugarcane borers

Abstract

The invention discloses a green prevention and control method for sugarcane borers, and relates to the technical field of crop disease and insect pest prevention and control. The green prevention and control method comprises the following steps: (1) thoroughly cleaning a garden in time after harvesting sugarcanes; (2) when newly planted sugarcanes are planted or ratoon sugarcanes are subjected to ridge breaking and stump loosening, biopesticide granules and decomposed farmyard manure are applied in planting ditches or nearby sugarcane stumps, and earthing and watering are carried out; the biopesticide granules are granules prepared by mixing a bacillus thuringiensis microbial inoculum and an auxiliary agent, and (3) interplanting spring soybeans among the sugarcane rows every year, continuously interplanting summer soybeans among the sugarcane rows after the spring soybeans are harvested, and applying pesticides to the soybeans and the sugarcanes in different areas during the planting period of the spring soybeans and the summer soybeans. According to the method, the bacillus thuringiensis fungicide, the auxiliaries and the decomposed farmyard manure are compounded for soil application, underground stem borers can be efficiently inhibited and killed, harm of sugarcane in the seedling stage is greatly reduced, meanwhile, the prevention and control effect of the natural enemy trichogramma can be exerted to the maximum extent through partitioned pesticide application, and the precise and efficient prevention and control effect is achieved.

Description

Technical Field

[0001] This invention relates to the field of crop pest and disease control technology, and in particular to a green control method for sugarcane borers. Background Technology

[0002] Sugarcane borer, commonly known as the sugarcane stem borer, is one of the most widespread and serious boring pests affecting sugarcane. It can have multiple generations within a year, with overlapping generations causing severe damage and becoming a key bottleneck restricting the high-quality development of the sugarcane industry. The damage caused by the sugarcane borer includes: preventing seedlings from sprouting; causing the death of the growing point and resulting in dead heart seedlings; and infesting sugarcane in the middle and later stages of growth, causing borer larvae to bore into the stalks and base, creating borer holes and damaging the internal tissues of the stalk, thus affecting sugarcane growth, reducing sugar content, and severely impacting sugarcane yield and quality. Statistics show that the rate of heart decay due to sugarcane borer damage during the seedling stage is generally 9% to 20%, and can reach 30% to 60% in severe cases. The rate of plant damage from sugarcane stem borer damage in the later stage is generally 40% to 60%, and can reach more than 80% in severe cases. Sugarcane borer damage causes sugarcane yield loss of 10% to 40%, with an average of 25.9%, and sugar content reduction rate of 0.8% to 5.6%, with an average of 2.2%, resulting in huge economic losses in sugarcane-growing areas.

[0003] Currently, chemical pesticides are the most effective means of controlling sugarcane borers. However, long-term use of chemical pesticides can easily lead to pesticide resistance in borers, disruption of ecological balance, and environmental pollution, resulting in significant negative effects. Therefore, there is an urgent need to find a highly efficient and green control method for sugarcane borers. Existing commonly used green control methods for sugarcane borers include: selecting insect-resistant varieties, implementing reasonable crop rotation or intercropping (such as intercropping soybeans or peanuts), and reducing agricultural control through continuous monoculture; using light traps (such as frequency-vibration insecticidal lamps) to trap adult borers and setting up sex pheromone traps to interfere with borer mating, among other physical control methods; utilizing natural enemies such as Trichogramma wasps and spiders; and promoting the use of biological pesticides such as Bacillus thuringiensis (Bt) and Beauveria bassiana. These control methods are effective to some extent, but they also have some problems: the survival rate of released Trichogramma wasps is low, and their lifespan and egg-laying capacity need to be further improved; microbial pesticides such as Bacillus thuringiensis (Bt) and Metarhizium anisopliae are greatly affected by the environment, have a slow onset of action, and their effects are unstable; although intercropping soybeans or peanuts between sugarcane rows can provide natural enemies such as Trichogramma wasps and spiders with nutrients and shelter, the eggs of noctuid moths in soybeans are also hosts for Trichogramma wasps. This expands the host selection range of Trichogramma wasps, causing some Trichogramma wasps to disperse and parasitize soybean noctuid moth eggs instead of concentrating on the key damaged parts of the sugarcane plant, which will greatly reduce the effectiveness of the natural enemies.

[0004] In summary, the present invention aims to provide a green control method for sugarcane borers, which makes the control more efficient. Summary of the Invention

[0005] To address the above shortcomings, this invention provides a green control method for sugarcane borers, solving the problem of insufficient control efficiency in existing green control methods for sugarcane borers. The specific technical solution is as follows: A green control method for sugarcane borers includes the following steps: (1) After the sugarcane is harvested, the dead leaves and residual stems in the field should be cleaned up in time and thoroughly, and they should be burned or disposed of in a harmless manner to reduce the number of pests on the ground and prevent them from becoming the source of pests in the following year. (2) When planting new sugarcane or loosening the ridges of ratooned sugarcane, apply biological pesticide granules and well-rotted farmyard manure in the planting ditch or near the sugarcane stalks, cover with soil, and water to keep the soil moist; the biological pesticide granules are granules made by mixing Bacillus thuringiensis inoculum with adjuvants, and the adjuvants include the following raw materials in parts by weight: 10-20 parts sugarcane concentrate, 1-2 parts glutamic acid, 2-4 parts lysine, 3-6 parts yeast extract and 0.5-2.5 parts chitinase; (3) Spring soybeans are intercropped between sugarcane rows every year. The sowing time for spring soybeans is from the end of February to the middle of March. After the spring soybeans are harvested, summer soybeans are intercropped between sugarcane rows. The sowing time for summer soybeans is from the end of May to the beginning of June. During the planting of spring soybeans and summer soybeans, pesticides are applied to soybeans and sugarcane in different areas. The pesticide application in different areas is as follows: a certain amount of Bacillus thuringiensis wettable powder is sprayed on soybeans in April-May and August-September, and pheromone traps are hung on soybeans. However, Bacillus thuringiensis wettable powder is not sprayed on sugarcane. Only Trichogramma egg cards are hung on the heart leaves or leaf sheaths of sugarcane.

[0006] Furthermore, in step (2), the application rate of the biological pesticide granules is 1-2 kg / mu, and the application rate of the decomposed farmyard manure is 500-900 kg / mu.

[0007] Furthermore, in step (2), the number of viable spores of the Bacillus thuringiensis agent is ≥10 billion / g.

[0008] Further, in step (2), the preparation method of the biological pesticide granules is as follows: by weight percentage, 15-25% of Bacillus thuringiensis inoculant, 12-24% of adjuvant, 6-9% of disintegrant sodium carboxymethyl starch, 0.5-1.5% of pH adjuster potassium dihydrogen phosphate, 0.5-1.5% of wetting agent sodium dodecyl sulfate and the balance of diatomaceous earth are mixed, extruded and granulated, and then dried at 40-45℃ until the moisture content is ≤5% to obtain biological pesticide granules with a particle size of 2-4mm.

[0009] Furthermore, in step (2), the sugarcane concentrate has a sugar content of 40-50%.

[0010] Furthermore, in step (3), the intercropping is to plant two rows of soybeans when the sugarcane row spacing is 1.2m, and to plant a single row of soybeans when the sugarcane row spacing is 1.0m.

[0011] Furthermore, in step (3), the Bacillus thuringiensis wettable powder is a wettable powder with 10 billion live spores / gram, and its application rate is 80-90g / mu, which is diluted with 40-50kg of water when applied.

[0012] Furthermore, in step (3), the sex pheromone trap is a sex pheromone trap for moths and crickets.

[0013] Furthermore, in step (3), the Trichogramma egg cards are suspended once every 3-5 days and released 2-3 times in a row, with 15-25 egg cards per mu per release.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention involves applying a compound of Bacillus thuringiensis inoculant, adjuvants, and well-rotted farmyard manure to the soil during the planting of newly planted sugarcane or when loosening the ridges of ratooned sugarcane. This effectively suppresses underground stem borers and other pests, significantly reducing the damage caused by pests to sugarcane seedlings. The well-rotted farmyard manure provides a warm and humid growth environment for Bacillus thuringiensis. The adjuvants provide initial nutrients to promote the germination and reproduction of Bacillus thuringiensis and attract stem borers to feed on it, accelerating the consumption of Bacillus thuringiensis by stem borers and other pests, thus increasing the intake. Therefore, the compound of Bacillus thuringiensis inoculant, adjuvants, and well-rotted farmyard manure solves the problems of Bacillus thuringiensis being greatly affected by environmental factors, having a slow onset of action, and exhibiting unstable effects after application.

[0015] 2. The combined action of sugarcane concentrate and yeast extract in the adjuvant of this invention attracts stem borers to feed on Bacillus thuringiensis; glutamic acid and lysine not only provide nutrition for Bacillus thuringiensis but also act as protectants, mitigating the damage caused by environmental stress, thereby enhancing the insecticidal effect; chitinase can improve the penetration of Bacillus thuringiensis into pests, thus enhancing the insecticidal effect. Therefore, the combined action of sugarcane concentrate, glutamic acid, lysine, yeast extract, and chitinase can promote rapid and stable efficacy of Bacillus thuringiensis.

[0016] 3. This invention employs a zoned application method when intercropping soybeans with sugarcane. Bacillus thuringiensis is sprayed onto soybeans to suppress soybean noctuid moths, reducing the number of noctuid moth eggs and narrowing the host selection range for Trichogramma wasps. This causes the wasps to concentrate their parasitism on the damaged parts of the sugarcane borer, increasing the parasitism rate on these areas. Simultaneously, pheromone traps targeting borers and noctuid moths are hung on the soybeans during Bacillus thuringiensis spraying, further enhancing the pest control effect on soybeans and reducing the amount of Bacillus thuringiensis required. Bacillus thuringiensis is not sprayed directly onto the sugarcane because sugarcane grows in clusters in the later stages, and the tall plants make it difficult to spray evenly and comprehensively on all damaged areas. Furthermore, large-scale application of Bacillus thuringiensis can negatively impact the parasitism ability of Trichogramma wasps. Therefore, zoned application maximizes the control effect of the natural enemy, Trichogramma wasps, achieving precise and efficient control. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of sugarcane intercropping with spring soybeans in Example 1. Detailed Implementation

[0019] The specific embodiments of the present invention are described in detail below, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments. Unless otherwise defined, all technical terms used below have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are for the purpose of describing specific embodiments only and are not intended to limit the scope of protection of the present invention. Unless otherwise specifically stated, all raw materials, reagents, instruments, and equipment used in the present invention are commercially available or can be prepared by existing methods.

[0020] Example 1 A green control method for sugarcane borers includes the following steps: (1) After the sugarcane is harvested, the dead leaves and residual stems in the field should be cleaned up in time and thoroughly, and they should be burned or disposed of in a harmless manner. This can reduce the number of pests on the ground and prevent them from becoming the source of pests in the following year.

[0021] (2) When breaking up the ridges and loosening the base of the ratooned sugarcane, apply 1 kg / mu of biological pesticide granules and 500 kg / mu of decomposed farmyard manure near the base of the sugarcane, cover with soil, and water to keep the soil moist; the biological pesticide granules are granules made by mixing Bacillus thuringiensis inoculum with 10 billion / g of live spores with adjuvants. The preparation method of the biological pesticide granules is as follows: by weight percentage, mix 15% of Bacillus thuringiensis inoculum, 12% of adjuvants, 6% of disintegrant sodium carboxymethyl starch, 0.5% of pH adjuster potassium dihydrogen phosphate, 0.5% of wetting agent sodium dodecyl sulfate and the remainder of diatomaceous earth, extrude and granulate, and then dry in a forced air at 40℃ to a moisture content of 5% to obtain biological pesticide granules with a particle size of 2 mm; The adjuvant comprises the following raw materials in parts by weight: 10 parts of sugarcane concentrate with a sugar content of 40%, 1 part of glutamic acid, 2 parts of lysine, 3 parts of yeast extract, and 0.5 parts of chitinase.

[0022] (3) Spring soybeans are intercropped between sugarcane rows every year. The sowing time for spring soybeans is February 25. After the spring soybeans are harvested, summer soybeans are intercropped between sugarcane rows. The sowing time for summer soybeans is June 5. Since the sugarcane row spacing is 1.2m, two rows of soybeans are intercropped in this embodiment. The soybean row spacing is 40cm and the plant spacing is 30cm. The sowing method is hole sowing, with 3-4 seeds per hole. During the planting of spring soybeans and summer soybeans, pesticides are applied to soybeans and sugarcane in different areas. The zonal application of pesticides is as follows: On April 15th, soybeans were sprayed with Bacillus thuringiensis wettable powder at a concentration of 10 billion live spores / gram, once every 5 days for two consecutive applications. Each application was 80g / mu, diluted with 40kg of water. The whole soybean plant was sprayed in the evening, and pheromone traps for stem borers and noctuid moths were hung on the soybeans. However, Bacillus thuringiensis wettable powder was not sprayed on sugarcane. Instead, Trichogramma wasp egg cards were hung on the heart leaves or leaf sheaths of the sugarcane, once every 3 days for two consecutive applications, at a rate of 15 egg cards / mu / application. On August 20th, soybeans were sprayed with Bacillus thuringiensis wettable powder at a concentration of 10 billion live spores / gram, once every 5 days for two consecutive applications. Each application was 80g / mu, diluted with 40kg of water. The whole soybean plant was sprayed in the evening, and pheromone traps targeting stem borers and noctuid moths were hung on the soybeans. However, Bacillus thuringiensis wettable powder was not sprayed on sugarcane. Instead, Trichogramma egg cards were hung on the heart leaves or leaf sheaths of the sugarcane, once every 3 days for two consecutive applications, at a rate of 30 egg cards / mu / application.

[0023] Example 2 A green control method for sugarcane borers includes the following steps: (1) After the sugarcane is harvested, the dead leaves and residual stems in the field should be cleaned up in time and thoroughly, and they should be burned or disposed of in a harmless manner. This can reduce the number of pests on the ground and prevent them from becoming the source of pests in the following year.

[0024] (2) When breaking up the ridges and loosening the base of the ratooned sugarcane, apply 2 kg / mu of biological pesticide granules and 900 kg / mu of decomposed farmyard manure near the base of the sugarcane, cover with soil, and water to keep the soil moist; the biological pesticide granules are granules made by mixing Bacillus thuringiensis inoculum with 10 billion / g of live spores with adjuvants. The preparation method of the biological pesticide granules is as follows: by weight percentage, mix 25% of Bacillus thuringiensis inoculum, 24% of adjuvants, 9% of disintegrant sodium carboxymethyl starch, 1.5% of pH adjuster potassium dihydrogen phosphate, 1.5% of wetting agent sodium dodecyl sulfate and the remainder of diatomaceous earth, extrude and granulate, and then dry in a forced air at 45℃ to a moisture content of 5% to obtain biological pesticide granules with a particle size of 4 mm; The adjuvant comprises the following raw materials in parts by weight: 20 parts of sugarcane concentrate with a sugar content of 50%, 2 parts of glutamic acid, 4 parts of lysine, 6 parts of yeast extract, and 2.5 parts of chitinase.

[0025] (3) Spring soybeans are intercropped between sugarcane rows every year. The sowing time for spring soybeans is February 25. After the spring soybeans are harvested, summer soybeans are intercropped between sugarcane rows. The sowing time for summer soybeans is June 5. Since the sugarcane row spacing is 1.2m, two rows of soybeans are intercropped in this embodiment. The soybean row spacing is 40cm and the plant spacing is 30cm. The sowing method is hole sowing, with 3-4 seeds per hole. During the planting of spring soybeans and summer soybeans, pesticides are applied to soybeans and sugarcane in different areas. The zonal application of pesticides is as follows: On April 15, soybeans were sprayed with Bacillus thuringiensis wettable powder at a concentration of 10 billion live spores / gram. The spraying was repeated every 7 days for a total of 3 times. Each application was 90g / mu, diluted with 50kg of water. The whole soybean plant was sprayed in the early morning. Sex traps for stem borers and noctuid moths were hung on the soybeans. However, Bacillus thuringiensis wettable powder was not sprayed on sugarcane. Instead, Trichogramma wasp egg cards were hung on the heart leaves or leaf sheaths of the sugarcane, once every 5 days for a total of 3 times. The ratio was 25 egg cards / mu / application. On August 20th, soybeans were sprayed with Bacillus thuringiensis wettable powder at a concentration of 10 billion live spores / gram, once every 7 days for a total of 3 times. Each application was 90g / mu, diluted with 50kg of water. The whole soybean plant was sprayed in the early morning, and pheromone traps targeting stem borers and noctuid moths were hung on the soybeans. However, Bacillus thuringiensis wettable powder was not sprayed on sugarcane. Instead, Trichogramma wasp egg cards were hung on the heart leaves or leaf sheaths of the sugarcane, once every 5 days for a total of 3 times, with 40 egg cards per mu per application.

[0026] Example 3 A green control method for sugarcane borers includes the following steps: (1) After the sugarcane is harvested, the dead leaves and residual stems in the field should be cleaned up in time and thoroughly, and they should be burned or disposed of in a harmless manner. This can reduce the number of pests on the ground and prevent them from becoming the source of pests in the following year.

[0027] (2) When breaking up the ridges and loosening the base of the ratooned sugarcane, apply 1.5 kg / mu of biological pesticide granules and 800 kg / mu of decomposed farmyard manure near the base of the sugarcane, cover with soil, and water to keep the soil moist; the biological pesticide granules are granules made by mixing Bacillus thuringiensis inoculum with a live spore count of 10 billion / g with adjuvants. The preparation method of the biological pesticide granules is as follows: by weight percentage, mix 20% of Bacillus thuringiensis inoculum, 18% of adjuvants, 7% of disintegrant sodium carboxymethyl starch, 1% of pH adjuster potassium dihydrogen phosphate, 1% of wetting agent sodium dodecyl sulfate and the remainder of diatomaceous earth, extrude and granulate, and then dry in a forced air at 45℃ to a moisture content of 5% to obtain biological pesticide granules with a particle size of 3 mm; The adjuvant comprises the following raw materials in parts by weight: 15 parts of sugarcane concentrate with a sugar content of 45%, 1.5 parts of glutamic acid, 3 parts of lysine, 4 parts of yeast extract, and 2 parts of chitinase.

[0028] (3) Spring soybeans are intercropped between sugarcane rows every year. The sowing time for spring soybeans is February 25. After the spring soybeans are harvested, summer soybeans are intercropped between sugarcane rows. The sowing time for summer soybeans is June 5. Since the sugarcane row spacing is 1.2m, two rows of soybeans are intercropped in this embodiment. The soybean row spacing is 40cm and the plant spacing is 30cm. The sowing method is hole sowing, with 3-4 seeds per hole. During the planting of spring soybeans and summer soybeans, pesticides are applied to soybeans and sugarcane in different areas. The zonal application of pesticides is as follows: On April 15th, soybeans were sprayed with Bacillus thuringiensis wettable powder at a concentration of 10 billion live spores / gram. The spraying was repeated every 6 days for a total of 3 times. Each application rate was 85g / mu, diluted with 45kg of water. The whole soybean plant was sprayed in the evening. Sex traps targeting stem borers and noctuid moths were hung on the soybeans. However, Bacillus thuringiensis wettable powder was not sprayed on sugarcane. Instead, Trichogramma wasp egg cards were hung on the heart leaves or leaf sheaths of the sugarcane, once every 4 days for a total of 3 times. The ratio was 20 egg cards / mu / application. On August 20th, soybeans were sprayed with Bacillus thuringiensis wettable powder at a concentration of 10 billion live spores / gram, once every 6 days for a total of 3 times. Each application was 85g / mu, diluted with 45kg of water. The whole soybean plant was sprayed in the evening, and pheromone traps targeting stem borers and noctuid moths were hung on the soybeans. However, Bacillus thuringiensis wettable powder was not sprayed on sugarcane. Instead, Trichogramma wasp egg cards were hung on the heart leaves or leaf sheaths of the sugarcane, once every 4 days for a total of 3 times, with 35 egg cards per mu per application.

[0029] Comparative Example 1: No adjuvants were used in this comparative example, and the other control steps were the same as in Example 2.

[0030] Comparative Example 2: The adjuvants used in this comparative example did not contain sugarcane concentrate or yeast extract, and the other control measures were the same as in Example 2.

[0031] Comparative Example 3: The adjuvants used in this comparative example did not contain glutamic acid and lysine, and the other control measures were the same as in Example 2.

[0032] Comparative Example 4: In this comparative example, soybeans were intercropped between sugarcane rows, but no zoned pesticide application method was used. Other control steps were the same as in Example 2. The specific pesticide application method was as follows: In May, soybeans and sugarcane were simultaneously sprayed with a wettable powder containing 10 billion live spores per gram of Bacillus thuringiensis. Spray soybeans every 7 days for 3 consecutive times. Each application is 90g / mu. Dilute with 50kg of water when applying. Spray the whole soybean plant in the early morning and hang sex pheromone traps for stem borers and noctuid moths on the soybeans. Spray sugarcane every 7 days for 3 consecutive times. The application rate is 90g / mu each time. When applying, dilute with 50kg of water. Spray the whole sugarcane in the early morning and hang Trichogramma egg cards on the sugarcane heart leaves or leaf sheaths. Hang them once every 5 days for 3 consecutive times, with 25 egg cards / mu / time. In September, soybeans and sugarcane were simultaneously sprayed with a wettable powder containing 10 billion live spores per gram of Bacillus thuringiensis. Spray soybeans every 7 days for 3 consecutive times. Each application is 90g / mu. Dilute with 50kg of water when applying. Spray the whole soybean plant in the early morning and hang sex pheromone traps for stem borers and noctuid moths on the soybeans. Spray the sugarcane every 7 days for 3 consecutive times. The application rate is 110g / mu each time. When applying, dilute with 55kg of water. Spray the whole sugarcane in the early morning and hang Trichogramma egg cards on the sugarcane heart leaves or leaf sheaths. Hang them once every 5 days for 3 consecutive times, with 40 egg cards per mu per application.

[0033] Comparative Example 5: In this comparative example, instead of hanging sex pheromone traps targeting stem borers and noctuid moths on soybeans, the amount of Bacillus thuringiensis was increased to 110 g / mu each time. Other control steps were the same as in Example 2.

[0034] To demonstrate the control effect of this invention, the applicant conducted an efficacy trial in a sugarcane field in Luoman Town, Liujiang County, Guangxi Province in 2023. The sugarcane variety used in the trial area was Guitang 21, which was in its second year of ratooning, and the intercropped soybean variety was Guichun 8. The land in the trial area was flat, with uniform fertility, and consistent field management. The trial was divided into 9 groups, with three replicates in each group. Each replicate consisted of 5 rows of sugarcane, with a row length of 10 meters and a row spacing of 1.2 meters. A protective row was set between each replicate. Groups 1 to 3 were controlled using the methods of Examples 1 to 3, respectively; groups 4 to 8 were controlled using the methods of Comparative Examples 1 to 5, respectively; group 9 was a control group and received no treatment. On June 1, the emergence rate, dead heart rate, and control efficacy of each group were investigated and statistically analyzed; on November 1, the percentage of plants infested with stem borers in each group was investigated and statistically analyzed. Emergence rate (%) = Number of seedlings that have emerged / Total number of seedlings surveyed × 100; Dead heart rate (%) = Number of dead heart seedlings / Total number of seedlings surveyed × 100; Control efficacy (%) = (Dry heart rate in blank group - Dry heart rate in experimental group) / Dry heart rate in blank group × 100; The percentage of plants damaged by stem borers (%) = number of plants damaged by stem borers / total number of plants surveyed × 100.

[0035] The results are shown in Table 1: Table 1 Comparison of prevention and control effects among different groups Note: Different lowercase letters after the data in the same column indicate significant differences at the 5% level (P<0.05). The data in groups 1 to 3 of Table 1 show that the green control method of this invention can achieve a high emergence rate and control efficacy, as well as a low rate of dead heart and stem borer infestation. The data in groups 1 and 4-6 show that the compound application of Bacillus thuringiensis inoculant, adjuvants, and well-rotted farmyard manure to the soil in this invention can effectively suppress underground stem borers, greatly reducing their damage to sugarcane seedlings. Furthermore, the combined effect of sugarcane concentrate, glutamic acid, lysine, yeast extract, and chitinase in the adjuvants can enhance the suppressive effect of Bacillus thuringiensis on stem borers. The data in groups 1 and 7 show that the zoned application method used in this invention when intercropping soybeans between sugarcane rows can improve control efficacy. Data from Groups 1 and 8 indicate that applying large amounts of Bacillus thuringiensis to soybeans actually reduced the control efficacy, which may be related to the fact that Bacillus thuringiensis has a certain impact on the parasitic ability of Trichogramma wasps. This suggests that the appropriate use of Bacillus thuringiensis, combined with pheromone traps targeting stem borers and noctuid moths, can maximize the control effect of the natural enemy Trichogramma wasps and achieve precise and efficient control results.

[0036] The yield and saturation of sugarcane and the yield of soybeans were statistically analyzed during the harvest period, and the results are shown in Table 2: Table 2. Sugarcane yield and bitterness, and soybean yield for each group. Note: Different lowercase letters after the data in the same column indicate significant differences at the 5% level (P<0.05). The data in Table 2 show that intercropping sugarcane with soybeans can improve the yield and quality of both sugarcane and soybeans to a certain extent. This indicates that by adopting the intercropping method and applying a compound of Bacillus thuringiensis inoculant, adjuvants, and well-rotted farmyard manure to the soil when breaking up the ridges and loosening the base of the ratooned sugarcane, as well as by adopting measures such as zoned application of pesticides, the effective control of stem borers can be achieved, thereby improving the yield and quality of sugarcane.

[0037] The foregoing description of specific exemplary embodiments of the invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the invention, as well as various different choices and variations. The scope of the invention is intended to be defined by the claims and their equivalents.

Claims

1. A green control method for sugarcane borers, characterized in that, Includes the following steps: (1) After the sugarcane is harvested, the dead leaves and residual stems in the field should be cleaned up in a timely and thorough manner and then burned or disposed of in a harmless manner. (2) When planting new sugarcane or loosening the ridges of ratooned sugarcane, apply biological pesticide granules and well-rotted farmyard manure in the planting ditch or near the sugarcane stalks, cover with soil, and water to keep the soil moist; the biological pesticide granules are granules made by mixing Bacillus thuringiensis inoculum with adjuvants, and the adjuvants include the following raw materials in parts by weight: 10-20 parts sugarcane concentrate, 1-2 parts glutamic acid, 2-4 parts lysine, 3-6 parts yeast extract and 0.5-2.5 parts chitinase; (3) Spring soybeans are intercropped between sugarcane rows every year. The sowing time for spring soybeans is from the end of February to the middle of March. After the spring soybeans are harvested, summer soybeans are intercropped between sugarcane rows. The sowing time for summer soybeans is from the end of May to the beginning of June. During the planting of spring soybeans and summer soybeans, pesticides are applied to soybeans and sugarcane in different areas. The pesticide application in different areas is as follows: a certain amount of Bacillus thuringiensis wettable powder is sprayed on soybeans in April-May and August-September, and pheromone traps are hung on soybeans. However, Bacillus thuringiensis wettable powder is not sprayed on sugarcane. Only Trichogramma egg cards are hung on the heart leaves or leaf sheaths of sugarcane.

2. The green control method for sugarcane borers according to claim 1, characterized in that, In step (2), the application rate of the biological pesticide granules is 1-2 kg / mu, and the application rate of the decomposed farmyard manure is 500-900 kg / mu.

3. The green control method for sugarcane borers according to claim 1, characterized in that, In step (2), the number of live spores of the Bacillus thuringiensis agent is ≥10 billion / g.

4. The green control method for sugarcane borers according to claim 1, characterized in that, In step (2), the preparation method of the biological pesticide granules is as follows: by weight percentage, 15-25% of Bacillus thuringiensis inoculant, 12-24% of adjuvant, 6-9% of sodium carboxymethyl starch, 0.5-1.5% of potassium dihydrogen phosphate, 0.5-1.5% of sodium dodecyl sulfate and the balance of diatomaceous earth are mixed, extruded and granulated, and then dried at 40-45℃ until the moisture content is ≤5% to obtain biological pesticide granules with a particle size of 2-4mm.

5. A green control method for sugarcane borers according to claim 1, characterized in that, In step (2), the sugarcane concentrate has a sugar content of 40-50%.

6. The green control method for sugarcane borers according to claim 1, characterized in that, In step (3), the intercropping is to plant two rows of soybeans when the sugarcane row spacing is 1.2m, and to plant a single row of soybeans when the sugarcane row spacing is 1.0m.

7. A green control method for sugarcane borers according to claim 1, characterized in that, In step (3), the application rate of the Bacillus thuringiensis wettable powder is 80-90g / mu, and it is diluted with 40-50kg of water when applied.

8. A green control method for sugarcane borers according to claim 1, characterized in that, In step (3), the sex pheromone trap is a sex pheromone trap for moths and crickets.

9. A green control method for sugarcane borers according to claim 1, characterized in that, In step (3), the Trichogramma egg cards are suspended once every 3-5 days and released 2-3 times in a row, with 15-25 egg cards per acre per release.

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