A kind of repellent for white-backed planthopper and its application

Abstract

The present invention belongs to the technical field of pesticides. The present invention provides a white-backed planthopper repellent, the components of which include at least one of 2-heptanol, trans-2-hexenol, and α-terpinene. The present invention has found that 2-heptanol, trans-2-hexenol, and α-terpinene all have high repellent activity against white-backed planthoppers, and can be used as repellents for white-backed planthoppers, reducing the insect population density, mating rate, and reproduction rate of white-backed planthoppers in rice fields, thereby achieving the purpose of preventing and controlling white-backed planthoppers. In addition, 2-heptanol, trans-2-hexenol, and α-terpinene are all plant-derived substances, which have the advantages of being safe and non-toxic to humans and animals, being environmentally friendly, and leaving no residue. 2-heptanol, trans-2-hexenol, and α-terpinene have good application prospects and value in pest control.

Description

Technical Field

[0001] The present invention belongs to the technical field of pesticides, and more specifically relates to a repellent for white-backed planthoppers and its application. Background Art

[0002] The white-backed planthopper (Sogatella furcifera Horváth, WBPH) belongs to the class Insecta, order Hemiptera, family Delphacidae. It not only harms crops such as rice but also serves as a vector for a variety of pests and diseases, such as Southern rice black-streaked dwarf virus (SRBSDV). The white-backed planthopper is the specific insect vector of SRBSDV, which persists and multiplies in its body without passing through eggs. Once infected, nymphs can transmit the virus throughout their lives. White-backed planthoppers primarily harm crops in two ways. First, adult and nymphal white-backed planthoppers directly suck the phloem of rice and feed on its sap. The wounds created by feeding make the rice susceptible to bacterial and fungal diseases, leading to the loss of nutrients and water, and in severe cases, death. Second, SRBSDV, which uses the white-backed planthopper as its sole vector, spreads through a persistent, multiplicative cycle. Extensive transmission of the virus severely damages rice yields. Therefore, the prevention and control of white-backed planthoppers is crucial.

[0003] Currently, the primary control method for white-backed planthoppers is the use of pesticides such as pymetrozine, ethomethrin, thiamethoxam, and imidacloprid, applied alternately in the field. However, pesticides can pose certain risks to the human nervous, respiratory, immune, and reproductive systems. Furthermore, there is a risk of pesticide residues in crops and soil, posing a potential risk to food safety and production security.

[0004] Therefore, it is of great significance to find green, natural, safe and effective pest repellents as new green pesticides. Summary of the Invention

[0005] The present invention aims to overcome the defects and shortcomings of existing pesticides for controlling white-backed plant hoppers and provides a white-backed plant hopper repellent.

[0006] The present invention aims to provide a white-backed planthopper repellent and application thereof.

[0007] The above-mentioned purpose of the present invention is achieved through the following technical solutions:

[0008] The present invention has found that 2-heptanol, trans-2-hexenol and α-terpinene all have high repellent activity against white-backed planthoppers, and therefore provides the following technical solutions:

[0009] Use of a composition comprising at least one of 2-heptanol, trans-2-hexenol and alpha-terpinene in repelling white-backed planthoppers.

[0010] Use of a composition comprising at least one of 2-heptanol, trans-2-hexenol and alpha-terpinene in preparing a white-backed planthopper repellent.

[0011] Application of a composition comprising at least one of 2-heptanol, trans-2-hexenol and α-terpinene in preventing and controlling white-backed planthopper pests.

[0012] Use of a composition comprising at least one of 2-heptanol, trans-2-hexenol and alpha-terpinene in preparing a medicine for preventing and controlling white-backed planthopper pests.

[0013] A composition for preparing a white-backed planthopper repellent comprises any one of 2-heptanol, trans-2-hexenol, alpha-terpinene, and a solvent.

[0014] A composition for preparing a white-backed planthopper repellent comprises any two of 2-heptanol, trans-2-hexenol, and α-terpinene, preferably in a volume ratio of (0.1-100):(0.1-100).

[0015] A composition for preparing a white-backed planthopper repellent comprises 2-heptanol, trans-2-hexenol and α-terpinene, preferably in a volume ratio of (0.1-100):(0.1-100):(0.1-100).

[0016] Preferably, the concentration of 2-heptanol in the composition is not less than 0.1 μL / mL.

[0017] More preferably, the concentration of 2-heptanol in the composition is not less than 1 μL / mL.

[0018] More preferably, the concentration of 2-heptanol in the composition is not less than 10 μL / mL.

[0019] Preferably, the concentration of trans-2-hexenol in the composition is not less than 1 μL / mL.

[0020] More preferably, the concentration of trans-2-hexenol in the composition is not less than 10 μL / mL.

[0021] Preferably, the concentration of α-terpinene in the composition is not less than 0.1 μL / mL.

[0022] More preferably, the concentration of α-terpinene in the composition is not less than 1 μL / mL.

[0023] More preferably, in the composition, the concentration of α-terpinene is not less than 10 μL / mL.

[0024] In addition, for cost considerations, the concentration of 2-heptanol, trans-2-hexenol or α-terpinene in the composition is not recommended to be too high. At a concentration of 100 μL / mL, significant repellent activity was shown.

[0025] Therefore, more preferably, the concentration of 2-heptanol in the composition is recommended to be (0.1-100) μL / mL.

[0026] More preferably, the concentration of 2-heptanol in the composition is recommended to be (1-100) μL / mL.

[0027] More preferably, the concentration of 2-heptanol in the composition is recommended to be (10-100) μL / mL.

[0028] Preferably, the concentration of trans-2-hexenol in the composition is recommended to be (1-100) μL / mL.

[0029] More preferably, the concentration of trans-2-hexenol in the composition is recommended to be (10-100) μL / mL.

[0030] Preferably, the α-terpinene concentration in the composition is recommended to be (0.1-100) μL / mL.

[0031] More preferably, the concentration of α-terpinene in the composition is recommended to be (1-100) μL / mL.

[0032] More preferably, the concentration of α-terpinene in the composition is recommended to be (10-100) μL / mL.

[0033] The white-backed planthopper repellent prepared from the above composition should also be within the scope of protection of the present invention.

[0034] The present invention has the following beneficial effects:

[0035] The present invention discovered that 2-heptanol, trans-2-hexenol, and α-terpinene all exhibit high repellent activity against white-backed planthoppers (S. furcifera). These compounds can be used as repellents to reduce population density, mating rate, and reproductive rate in rice paddies, thereby achieving the goal of controlling the insects. Furthermore, 2-heptanol, trans-2-hexenol, and α-terpinene are all plant-derived substances that are safe and non-toxic to humans and animals, environmentally friendly, and leave no residue. Under the current concept of green agricultural development, 2-heptanol, trans-2-hexenol, and α-terpinene have promising application prospects and value in pest control. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic diagram of the H-type olfactometer.

[0037] Figure 2This is a diagram showing the selection effect of white-backed planthoppers under the influence of 2-heptanol measured by the H-type olfactometer.

[0038] Figure 3 The H-type olfactometer was used to measure the selection rate of white-backed planthoppers under the influence of different concentrations of 2-heptanol.

[0039] Figure 4 This is a diagram showing the selection effect of white-backed planthoppers under the influence of trans-2-hexenol measured by the H-type olfactometer.

[0040] Figure 5 The selection rate of white-backed planthopper under the influence of different concentrations of trans-2-hexenol was measured using an H-type olfactometer.

[0041] Figure 6 This is a diagram showing the selection effect of white-backed planthoppers under the influence of α-terpinene measured by the H-type olfactometer.

[0042] Figure 7 The selection rate of white-backed planthopper under the influence of different concentrations of α-terpinene was measured using an H-type olfactometer.

[0043] Figure 8 The H-type olfactometer was used to measure the selectivity of white-backed planthoppers under the influence of a mixture of 2-heptanol, trans-2-hexenol, and α-terpinene.

[0044] Figure 9 Diagram of the olfactometer schema for the double-choice arena.

[0045] Figure 10 A diagram showing the choice effect of white-backed planthoppers under the influence of 2-heptanol in a double-choice arena olfactometer.

[0046] Figure 11 The choice rate of white-backed planthoppers under the influence of different concentrations of 2-heptanol was measured using a double-choice arena olfactometer.

[0047] Figure 12 A diagram showing the selection effect of white-backed planthoppers under the influence of 100 μL / mL trans-2-hexenol in a double-choice arena olfactometer.

[0048] Figure 13 The choice rate of white-backed planthoppers under the influence of 100 μL / mL trans-2-hexenol was measured using a double-choice arena olfactometer.

[0049] Figure 14 A diagram showing the selection effect of white-backed planthoppers under the influence of 100 μL / mL α-terpinene in a double-choice arena olfactometer.

[0050] Figure 15 The choice rate of white-backed planthoppers under the influence of 100 μL / mL α-terpinene was measured using a double-choice arena olfactometer.

[0051] Figure 16 The selection rate of white-backed planthopper under the influence of different concentrations of nonadecane was measured using an H-type olfactometer.

[0052] Figure 17 The selection rate of white-backed planthopper under the influence of different concentrations of 2-tridecanone was measured using an H-type olfactometer. DETAILED DESCRIPTION

[0053] The present invention will be further described below with reference to the accompanying drawings and specific examples, but the examples do not limit the present invention in any way. Unless otherwise specified, the reagents, methods and equipment used in the present invention are conventional reagents, methods and equipment in the art.

[0054] Unless otherwise specified, the reagents and materials used in the following examples were commercially available.

[0055] In the following examples, adult white-backed planthoppers were captured from rice fields at the experimental base of South China Agricultural University in Guangzhou and reared and propagated for multiple generations in a laboratory under a photoperiod of light (L): dark (D) = 16:8. The rice variety used for the white-backed planthoppers was Nipponbare (Oryza sativa L. spp. japonica).

[0056] 2-Heptanol, trans-2-hexenol, α-terpinene, paraffin oil, nonadecane, 2-tridecanone, and n-hexane were purchased from Shanghai MacLean Biochemical Technology Co., Ltd.; the product numbers are H810771, H810813, A833311, P815701, N814478, T819059, and H810749, respectively.

[0057] 2-Heptanol, CAS No. 543-49-7, structural formula:

[0058] Trans-2-hexenol, CAS No. 928-95-0, structural formula:

[0059] α-Terpinene, CAS number is 99-86-5, the structural formula is:

[0060] Nonadecane, CAS No. 629-92-5, has the structural formula:

[0061]

[0062] 2-Tridecanone, CAS No. 593-08-8, structural formula: Example 1 Determination of the Attraction and Avoidance of White-backed Planthopper Adults to 2-heptanol Using the H-type Olfactometer

[0063] (1) Experimental methods

[0064] Using paraffin oil as solvent, 2-heptanol solutions of different concentrations were prepared according to Table 1 as treatment groups.

[0065] Table 1 2-heptanol concentrations in different treatments

[0066] Treatment group 2-Heptanol (μL / mL) 1 0.1 2 1 3 10 4 100

[0067] The H-type olfactometer (insect olfactometer) was used to measure the choice behavior of white-backed planthoppers. Figure 1 As shown, the H-type olfactometer has a diameter of 3 cm, a length of 24 cm, a height of 16 cm, and a 3 cm diameter entrance in the middle to release insects.

[0068] The specific method for measuring the choice behavior response of white-backed planthoppers using the H-type olfactometer is as follows:

[0069] The experimental group placed filter paper with 100 μL of odor source compound solution (i.e., treatment group solution) added in one side tube of the H-type olfactometer, while the control group placed filter paper with 100 μL of paraffin oil added in the other side tube. The entire device was carried out in an 80 cm × 80 cm × 80 cm black box with uniform light source. The experimental duration was selected for 3 hours.

[0070] The assay standard was based on the presence of white-backed planthoppers in the inlet tube, with 20 insects per group, replicated four times (eight replicates for treatments with a clear trend). After each experiment, the H-type olfactometer was cleaned with 75% ethanol and water, respectively, and dried in an oven to prevent residual odor from interfering with selection. The selectivity rate and the blank control selectivity rate were calculated using the following formula.

[0071]

[0072] (2) Experimental results

[0073] The selection effect and selection rate of white-backed planthoppers under the influence of different concentrations of 2-heptanol were measured by H-type olfactometer. Figure 2 and Figure 3 As shown, the results show that under the experimental conditions of the H-type olfactometer:

[0074] The average selectivity of 0.1 μL / mL 2-heptanol treatment was 30%, and the average selectivity of the blank control was 50%;

[0075] The average selectivity of 1 μL / mL 2-heptanol treatment was 22.5%, and the average selectivity of the blank control was 53.125%;

[0076] The average selectivity of the 10 μL / mL 2-heptanol treatment was 19.375%, and the average selectivity of the blank control was 53.125%;

[0077] The average selectivity of the 100 μL / mL 2-heptanol treatment was 15.625%, and the average selectivity of the blank control was 65.625%.

[0078] The results showed that treatment with 2-heptanol at a concentration of (0.1-100) μL / mL had a certain repellent activity against white-backed planthoppers, and the repellent activity was positively correlated with the concentration of 2-heptanol.

[0079] Example 2: Determination of the Aversion of White-backed Planthopper Adults to Trans-2-hexenol Using the H-type Olfactometer

[0080] (1) Experimental methods

[0081] Using paraffin oil as solvent, trans-2-hexenol solutions of different concentrations were prepared according to Table 2 as treatment groups.

[0082] Table 2 Concentrations of trans-2-hexenol in different treatments

[0083] Treatment group trans-2-hexenol (μL / mL) 1 1 2 100

[0084] The avoidance of adults of white-backed plant hoppers to trans-2-hexenol was determined according to the specific method of measuring the selective behavioral response of white-backed plant hoppers using the H-type olfactometer in Example 1.

[0085] (2) Experimental results

[0086] The selection effect and selection rate of white-backed planthoppers under the influence of different concentrations of trans-2-hexenol were determined by H-type olfactometer. Figure 4 and Figure 5 As shown, the results show that under the experimental conditions of the H-type olfactometer:

[0087] The average selectivity of the 1 μL / mL trans-2-hexenol treatment was 12.5%, and the average selectivity of the blank control was 37.5%;

[0088] The average selectivity of the 100 μL / mL trans-2-hexenol treatment was 16.25%, and the average selectivity of the blank control was 44.375%.

[0089] The results showed that treatment with trans-2-hexenol at a concentration of (1-100) μL / mL had repellent activity against white-backed planthoppers, and the repellent activity was positively correlated with the concentration of trans-2-hexenol.

[0090] Example 3: Determination of the aversion of white-backed planthopper adults to α-terpinene using the H-type olfactometer choice behavior method

[0091] (1) Experimental methods

[0092] Using paraffin oil as solvent, α-terpinene solutions of different concentrations were prepared according to Table 3 as treatment groups.

[0093] Table 3 Concentration of α-terpinene in different treatments

[0094] Treatment group α-Terpinene (μL / mL) 1 0.1 2 1 3 10 4 100

[0095] The specific method of measuring the selective behavioral response of white-backed planthoppers using the H-type olfactometer in Example 1 was used to measure the avoidance of white-backed planthoppers adults to α-terpinene.

[0096] (2) Experimental results

[0097] The selection results and selection rates of white-backed planthoppers under the influence of different concentrations of α-terpinene were measured by H-type olfactometer. Figure 6 and Figure 7 As shown, the results show that under the experimental conditions of the H-type olfactometer:

[0098] The average selectivity of the 0.1 μL / mL α-terpinene treatment was 12.5%, and the average selectivity of the blank control was 15%;

[0099] The average selectivity of the 1 μL / mL α-terpinene treatment was 9.375%, and the average selectivity of the blank control was 16.25%;

[0100] The average selectivity of the 10 μL / mL α-terpinene treatment was 14.0625%, and the average selectivity of the blank control was 35%;

[0101] The average selectivity of the 100 μL / mL α-terpinene treatment was 9.375%, and the average selectivity of the blank control was 67.5%.

[0102] The results showed that treatment with α-terpinene at a concentration of (0.1-100) μL / mL had repellent activity against white-backed planthoppers, and the repellent activity was positively correlated with the α-terpinene concentration.

[0103] Example 5: Determination of the avoidance of adult white-backed planthoppers to a mixture of 2-heptanol, trans-2-hexenol, and α-terpinene using the H-type olfactometer choice behavior method

[0104] (1) Experimental methods

[0105] Using paraffin oil as the solvent, 2-heptanol solution, trans-2-hexenol solution, and α-terpinene solution were prepared at a concentration of 100 μL / mL, respectively. The 2-heptanol solution, trans-2-hexenol solution, and α-terpinene solution were mixed at a volume ratio of 1:1:1, and the uniformly mixed solution was used as the treatment group.

[0106] The specific method for measuring the selective behavioral response of white-backed planthoppers using the H-type olfactometer in Example 1 was used to measure the avoidance of white-backed planthoppers adults to a mixture of 2-heptanol, trans-2-hexenol, and α-terpinene.

[0107] (2) Experimental results

[0108] The selection rate of white-backed planthoppers under the influence of a mixture of 2-heptanol, trans-2-hexenol and α-terpinene was determined by H-type olfactometer. Figure 8 The results showed that under the experimental conditions of the H-type olfactometer, the average selectivity of the 2-heptanol, trans-2-hexenol, and α-terpinene mixture was 8.75%, while the average selectivity of the blank control was 61.25%. This result indicates that the 2-heptanol, trans-2-hexenol, and α-terpinene mixture has strong repellent activity against white-backed planthoppers.

[0109] Example 6 Double-choice arena olfactometer measurement of the avoidance of white-backed planthopper adults to 2-heptanol

[0110] (1) Experimental methods

[0111] Using paraffin oil as a solvent, 2-heptanol solutions of different concentrations were prepared according to Table 1 of Example 1 as treatment groups.

[0112] A double-choice arena olfactometer was used to measure the avoidance of white-backed planthopper adults to 2-heptanol. Figure 9 As shown, the double-choice arena olfactometer is divided into two choice rooms and a release room. The total width of the arena is 7 cm, the total length is 34 cm, and the height is 5 cm. The length and width of the rooms on both sides are 7 cm. There is a 3 cm small door leading to the small rooms on both sides for insects to enter and exit.

[0113] The specific method for measuring the choice behavior response of white-backed planthoppers using a double-choice arena olfactometer is as follows:

[0114] An experimental group and a control group were set up. The experimental group had filter paper added with 100 μL of odor source compound solution (i.e., treatment group solution) placed in one room; the control group had filter paper added with 100 μL of paraffin oil placed in the other room.

[0115] Air was supplied by air pumps on both sides of the double-choice arena olfactometer at a flow rate of 400 mL / min, followed by activated carbon for air purification, followed by purified water for humidification, and the entire device was placed in an 80 cm × 80 cm × 80 cm black box with uniform light source. The experimental selection duration was 3 h.

[0116] The assay was based on the selection of white-backed planthoppers in the adjacent chamber. Each group consisted of 50 insects, with four replicates (eight replicates for treatments with a clear trend). After each experiment, the olfactometer was cleaned with 75% ethanol and then water, respectively, and dried in an oven to prevent residual odor from interfering with selection. The selectivity was calculated using the following formula.

[0117]

[0118]

[0119] (2) Experimental results

[0120] The selection effect and selection rate of white-backed planthopper under the influence of different concentrations of 2-heptanol were measured by double-choice arena olfactometer. Figure 10 and Figure 11 As shown, the results show that under the experimental conditions of the two-choice arena:

[0121] The average selectivity of the 0.1 μL / mL 2-heptanol concentration treatment was 37%, and the average selectivity of the blank control was 44.5%;

[0122] The average selectivity of the treatment with 1 μL / mL 2-heptanol concentration was 35%, and the average selectivity of the blank control was 52.25%;

[0123] The average selectivity of the 10 μL / mL 2-heptanol concentration treatment was 31.75%, and the average selectivity of the blank control was 57.75%;

[0124] The average selectivity of the treatment with 100 μL / mL 2-heptanol concentration was 28%, and the average selectivity of the blank control was 49%.

[0125] The results indicate that 2-heptanol at a concentration of (0.1-100) μL / mL has repellent activity against white-backed planthoppers, and the repellent effect becomes more pronounced as the concentration of 2-heptanol increases.

[0126] Example 7: Double-choice arena determination of the avoidance of white-backed planthopper adults to trans-2-hexenol

[0127] (1) Experimental methods

[0128] Paraffin oil was used as solvent to prepare a 100 μL / mL trans-2-hexenol solution as the treatment group.

[0129] The avoidance of adults of white-backed plant hoppers to trans-2-hexenol was determined according to the specific method of measuring the choice behavior response of white-backed plant hoppers using the double-choice arena olfactometer in Example 6.

[0130] (2) Experimental results

[0131] The selection effect and selection rate of white-backed planthoppers under the influence of 100 μL / mL concentration of trans-2-hexenol were measured by double-choice arena olfactometer. Figure 12 and Figure 13 As shown, the results show that:

[0132] Under the experimental conditions of the double-selection arena, the average selection rate of the 100 μL / mL trans-2-hexenol treatment was 34.25%, and the average selection rate of the blank control was 55.25%.

[0133] The results indicate that trans-2-hexenol has obvious repellent activity against white-backed planthoppers.

[0134] Example 8: Double-choice arena determination of the avoidance of white-backed planthopper adults to α-terpinene

[0135] (1) Experimental methods

[0136] Paraffin oil was used as solvent to prepare a 100 μL / mL α-terpinene solution as the treatment group.

[0137] The avoidance of adults of the white-backed planthopper to α-terpinene was determined according to the specific method of measuring the choice behavior response of the white-backed planthopper using the double-choice arena olfactometer in Example 6.

[0138] (2) Experimental results

[0139] The selection effect and selection rate of white-backed planthoppers under the influence of 100 μL / mL concentration of α-terpinene were measured by double-choice arena olfactometer. Figure 14 and Figure 15 As shown, the results show that:

[0140] Under the experimental conditions of the double-selection arena, the average selection rate of the 100 μL / mL α-terpinene treatment was 19.75%, and the average selection rate of the blank control was 52%.

[0141] The results indicate that α-terpinene has obvious repellent activity against white-backed planthoppers.

[0142] In summary, the present invention found that 2-heptanol, trans-2-hexenol and α-terpinene all have high repellent activity against white-backed planthoppers. In addition, 2-heptanol, trans-2-hexenol and α-terpinene have no adverse effects on the environment and can be used as repellents for white-backed planthoppers, with good practical application prospects in the development of integrated pest control. Comparative Example 1 Determination of the repellency of white-backed planthopper adults to nonadecane and 2-tridecanone

[0143] (1) Experimental methods

[0144] Chromatographically pure n-hexane was used as the solvent to prepare 0.1 μg / mL and 100 μg / mL nonadecane solutions and 2-tridecanone solutions as treatment groups, respectively. n-hexane was used as the control group (using filter paper supplemented with 100 μL of n-hexane).

[0145] The specific method for measuring the selective behavioral response of white-backed planthoppers using the H-type olfactometer in Example 1 was used to measure the avoidance of white-backed planthoppers to nonadecane and 2-tridecanone.

[0146] (2) Experimental results

[0147] The selection rate of white-backed planthopper under the influence of different concentrations of nonadecane was measured by H-type olfactometer. Figure 16 The results show that, under the experimental conditions of the H-type olfactometer, the selectivity of the 100 μg / mL treatment averaged 18.75%, compared to 38.75% for the blank control. The selectivity of the 0.1 μg / mL treatment averaged 30%, compared to 26.25% for the blank control. These results indicate that nonadecane at a concentration of 0.1 μg / mL has no repellent activity against white-backed planthoppers, and its selectivity is actually higher than that of the blank control. While the selectivity of the 100 μg / mL treatment is lower than that of the blank control, its performance remains poor at the higher concentration (100 μg / mL). Therefore, all factors considered, nonadecane cannot be used as a repellent for white-backed planthoppers.

[0148] H-type olfactometer was used to determine the selection rate of white-backed planthoppers under the influence of different concentrations of 2-tridecanone. Figure 17 As shown, the results showed that the average selectivity of the 100 μg / mL concentration treatment was 41.25%, and the average selectivity of the blank control was 32.5%; the average selectivity of the 0.1 μg / mL concentration treatment was 35%, and the average selectivity of the blank control was 22.5%. This result indicates that 2-tridecanone has no repellent activity against white-backed planthoppers.

[0149] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be considered as equivalent replacement methods and are included in the scope of protection of the present invention.

Claims

1. A composition for preparing a white-backed planthopper repellent, characterized in that: The invention comprises 2-heptanol, trans-2-hexenol and alpha-terpinene, wherein the volume ratio of the 2-heptanol, trans-2-hexenol and alpha-terpinene is 1:1:

1.

2. Use of the composition according to claim 1 in repelling white-backed plant hopper.

3. Use of the composition according to claim 1 in preparing a white-backed planthopper repellent.

4. Use of the composition according to claim 1 in preventing and controlling white-backed plant hopper pests.

5. Use of the composition according to claim 1 in preparing a medicament for controlling white-backed plant hopper pests.

6. A white-backed planthopper repellent, characterized in that Contains the composition according to claim 1.

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