阅读说明：本技术 一种能同时引诱稻纵卷叶螟雌蛾和雄蛾的引诱剂及其应用 (Attractant capable of simultaneously attracting female moths and male moths of rice leaf rollers and application of attractant ) 是由 郑许松 吕仲贤 徐红星 鲁艳辉 杨亚军 田俊策 于 2021-07-16 设计创作，主要内容包括：本发明涉及害虫防治领域,特别是涉及一种稻纵卷叶螟引诱剂及其应用。本发明所述稻纵卷叶螟引诱剂包括以下重量百分含量的组分：20％～55％苯乙醛、20％～55％乙酸苯甲酯、5％～20％己醛和3％～17％庚醇。本发明通过将苯乙醛、乙酸苯甲酯、己醛和庚醇进行复配使用,不仅可以同时引诱稻纵卷叶螟雄蛾和雌蛾,且引诱效果显著优于性诱剂；本发明的引诱剂对于稻纵卷叶螟的诱捕量是市售稻纵卷叶螟性引诱剂的10倍以上,且诱捕的稻纵卷叶螟雌蛾的比例也超过50％。(The invention relates to the field of pest control, in particular to a rice leaf roller attractant and application thereof. The attractant for the rice leaf roller comprises the following components in percentage by weight: 20 to 55 percent of phenylacetaldehyde, 20 to 55 percent of benzyl acetate, 5 to 20 percent of hexanal and 3 to 17 percent of heptanol. According to the invention, the phenylacetaldehyde, the benzyl acetate, the hexanal and the heptanol are compounded for use, so that male moths and female moths of the rice leaf rollers can be simultaneously attracted, and the attraction effect is obviously better than that of a sex attractant; the trapping amount of the attractant of the invention to the rice leaf roller is more than 10 times of that of the commercial rice leaf roller sex attractant, and the proportion of the trapped rice leaf roller female moths is over 50 percent.)

1. The cnaphalocrocis medinalis attractant is characterized by comprising the following components in percentage by weight: 20 to 55 percent of phenylacetaldehyde, 20 to 55 percent of benzyl acetate, 5 to 20 percent of hexanal and 3 to 17 percent of heptanol.

2. The rice leaf roller attractant as claimed in claim 1, wherein the rice leaf roller attractant comprises the following components in percentage by weight: 20 to 54.8 percent of phenylacetaldehyde, 20.2 to 55 percent of benzyl acetate, 5.2 to 18.8 percent of hexanal and 3.2 to 16.8 percent of heptanol.

3. Use of the rice leaf roller attractant according to claim 1 or 2 for controlling and/or monitoring rice leaf roller.

4. The use of claim 3, wherein the cnaphalocrocis medinalis comprises a female cnaphalocrocis medinalis and/or a male cnaphalocrocis medinalis.

5. A method for trapping rice leaf rollers, comprising: the cnaphalocrocis medinalis attractant of claim 1 or 2 is mixed with a nonvolatile organic solvent, and then placed into a trapping device to trap female moths and/or male moths of the cnaphalocrocis medinalis.

6. A method as claimed in claim 5, wherein the weight-to-volume ratio of the cnaphalocrocis medinalis attractant to the nonvolatile organic solvent is (100-400) mg (0.1-0.3) mL.

7. The method of claim 5 or 6, wherein the non-volatile organic solvent comprises one or more of liquid paraffin, mineral oil, and sunflower oil.

8. The method of claim 5, wherein the trap comprises a disorienting wire.

9. The method of claim 8, wherein the material of the disorienting filament comprises polyethylene or polypropylene.

10. The method according to claim 8 or 9, wherein the wall thickness of the labyrinth wire is 0.01-0.1 mm.

Technical Field

The invention relates to the field of pest control, in particular to an attractant capable of simultaneously attracting female moths and male moths of rice leaf rollers and application thereof.

Background

The rice leaf roller is an important migratory pest on rice in China and southeast Asia, the larva longitudinal leaf roller is damaged by eating, only the epidermis is left, white stripe is formed, the photosynthesis of crops is influenced, the yield is generally reduced by 20% -30%, and the rice field is withered and white even no grains are harvested in large occurrence.

At present, the control of cnaphalocrocis medinalis is mainly carried out by chemical pesticides, but a great amount of chemical pesticides which are unreasonably used often seriously kill natural enemies to cause ecological deterioration and cause the problems of drug resistance, pesticide residue, food safety and the like of pests.

The sex pheromone is used for biological control of the rice leaf roller, and the action principle of the sex pheromone is to trap and kill male moths of the rice leaf roller and interfere the mating between the female moths of the rice leaf roller, thereby reducing the mating chance of the female moths of the rice leaf roller and reducing the egg laying amount of the female moths. For example, CN106973896A discloses that a sex pheromone combination consisting of cis 13-octadecenal, cis 11-octadecenal and cis 13-octadecenol has good attraction effect on rice leaf rollers; CN1792145A describes a formula for trapping rice leaf rollers, which is prepared by mixing benzyl alcohol, benzaldehyde and phenylacetaldehyde.

However, when luring cnaphalocrocis medinalis in the prior art, the luring target is mainly aimed at male cnaphalocrocis medinalis, male cnaphalocrocis medinalis can mate for many times in a lifetime, when the population quantity of the field cnaphalocrocis medinalis is low, a good prevention and control effect can be achieved, and when the population density of the field cnaphalocrocis medinalis is high, the prevention and control effect is limited. Only when the amphoteric attractant capable of simultaneously and efficiently attracting female and male rice leaf rollers is applied, a better field control effect can be achieved.

Disclosure of Invention

In order to solve the problems, the invention provides an attractant capable of attracting female moths and male moths of rice leaf rollers simultaneously and application thereof. The attractant for the rice leaf roller can attract male moths and female moths of the rice leaf roller simultaneously, and the attraction effect is obviously better than that of a conventional attractant.

In order to achieve the above purpose, the invention provides the following technical scheme:

the invention provides a rice leaf roller attractant which comprises the following components in percentage by weight: 20 to 55 percent of phenylacetaldehyde, 20 to 55 percent of benzyl acetate, 5 to 20 percent of hexanal and 3 to 17 percent of heptanol.

Preferably, the cnaphalocrocis medinalis attractant comprises the following components in percentage by weight: 20 to 54.8 percent of phenylacetaldehyde, 20.2 to 55 percent of benzyl acetate, 5.2 to 18.8 percent of hexanal and 3.2 to 16.8 percent of heptanol.

The invention also provides application of the rice leaf roller attractant in preventing, controlling and/or monitoring rice leaf rollers.

Preferably, the cnaphalocrocis medinalis comprises a cnaphalocrocis medinalis female moth and/or a cnaphalocrocis medinalis male moth.

The invention also provides a method for trapping rice leaf rollers, which comprises the following steps: the cnaphalocrocis medinalis attractant is mixed with a nonvolatile organic solvent and then placed into a trapping device to trap female moths and/or male moths of the cnaphalocrocis medinalis.

Preferably, the weight volume ratio of the cnaphalocrocis medinalis attractant to the nonvolatile organic solvent is (100-400) mg (0.1-0.3) mL.

Preferably, the non-volatile organic solvent comprises one or more of liquid paraffin, mineral oil and sunflower oil.

Preferably, said trapping device comprises a disorientation thread.

Preferably, the material of the disorientation silk comprises polyethylene or polypropylene.

Preferably, the tube wall thickness of the disorientation silk is 0.01-0.1 mm.

Has the advantages that:

the invention provides a rice leaf roller attractant which comprises the following components in percentage by weight: 20 to 55 percent of phenylacetaldehyde, 20 to 55 percent of benzyl acetate, 5 to 20 percent of hexanal and 3 to 17 percent of heptanol. According to the invention, the phenylacetaldehyde, the benzyl acetate, the hexanal and the heptanol are compounded for use, so that male moths and female moths of the rice leaf rollers can be simultaneously attracted, and the attraction effect is obviously better than that of a conventional attractant; the trapping amount of the attractant of the invention to the rice leaf roller is more than 10 times of that of the commercial rice leaf roller sex attractant, and the proportion of the trapped rice leaf roller female moths is over 50 percent.

Detailed Description

The invention provides a rice leaf roller attractant which comprises the following components in percentage by weight: 20 to 55 percent of phenylacetaldehyde, 20 to 55 percent of benzyl acetate, 5 to 20 percent of hexanal and 3 to 17 percent of heptanol.

The source of each component in the cnaphalocrocis medinalis attractant is not limited in the present invention, and commercially available products well known to those skilled in the art may be used without specific description.

In the rice leaf roller attractant, the weight percentage of phenylacetaldehyde is 20-55%, preferably 20-54.8%, and more preferably 41.5%. The phenylacetaldehyde is a flower fragrance component, has a broad-spectrum attracting effect on insect moths, and guides adult moths to be remotely positioned.

In the rice leaf roller attractant, the content of the benzyl acetate is 20-50% by weight, preferably 20.2-55% by weight, and more preferably 36.5% by weight. The benzyl acetate is a flower fragrance component, has a broad-spectrum attraction effect on insect moths, guides adult moths to be remotely positioned, and has a synergistic effect when being compounded with phenylacetaldehyde.

In the rice leaf roller attractant, the weight percentage content of hexanal is 5-20%, preferably 5.2-18.8%, and more preferably 5.2%. The hexanal is a green leaf substance component, has an obligate attracting effect on the rice leaf rollers when being compounded with the flower fragrance substance, and guides the rice leaf rollers to be directionally positioned at a short distance.

In the rice leaf roller attractant, the weight percentage content of the heptanol is 3% -17%, preferably 3.2% -16.8%, and more preferably 16.8%. The heptanol is a green leaf substance component, has an obligate attracting effect on the cnaphalocrocis medinalis guenee when being compounded with a flower fragrance substance, and guides the cnaphalocrocis medinalis guenee to be directionally positioned at a short distance.

According to the invention, the phenylacetaldehyde, the benzyl acetate, the hexanal and the heptanol are compounded and used according to a proper proportion, so that the male moth and the female moth of the rice leaf roller can be simultaneously attracted, and the attraction effect is obviously better than that of a conventional sex attractant.

The invention also provides application of the rice leaf roller attractant in preventing, controlling and/or monitoring rice leaf rollers. In the present invention, the cnaphalocrocis medinalis preferably comprises a cnaphalocrocis medinalis female moth and/or a cnaphalocrocis medinalis male moth. The attractant provided by the invention can attract male moths and female moths of the rice leaf rollers simultaneously, and is used for preventing and treating the rice leaf rollers; and the method can also be used for monitoring the insect situation, the insect trapping amount can accurately predict the occurrence dynamics of the rice leaf rollers, and the monitoring accuracy is high.

The invention also provides a method for trapping rice leaf rollers, which comprises the following steps: the rice leaf roller attractant is mixed with a nonvolatile organic solvent and then placed into a trapping device to trap female moths and/or male moths of the rice leaf roller.

In the invention, the weight-volume ratio of the cnaphalocrocis medinalis attractant to the nonvolatile organic solvent is preferably (100-400) mg, (0.1-0.3) mL, more preferably (200-300) mg, (0.2-0.28) mL, and most preferably 250mg:0.25 mL; the non-volatile organic solvent preferably comprises one or more of liquid paraffin, mineral oil and sunflower oil. The source of the nonvolatile organic solvent is not limited in the present invention, and commercially available products known to those skilled in the art may be used.

In the present invention, it is preferable that the above-mentioned cnaphalocrocis medinalis attractant is mixed with a nonvolatile organic solvent, and further comprises: filling the mixed solution into a disorientation silk, and fixing the disorientation silk in a trap to trap female moths and/or male moths of the rice leaf rollers; after the mixed solution is filled into the disorientation silk, preferably, the method also comprises the steps of sealing two ends of the disorientation silk; the material of the disorientation silk preferably comprises polyethylene or polypropylene; the tube wall thickness of the disorientation silk is preferably 0.01-0.1 mm. The source of the trap is not limited by the present invention and any commercially available product known to those skilled in the art may be used.

The method for trapping rice leaf rollers provided by the invention has the advantages of strong specificity, no resistance, no harm to natural enemies, no toxicity to people and livestock and environmental friendliness; the stress resistance is strong, and the wind, the rain and the sunshine are not afraid; meanwhile, the preparation is simple, the use is simple, and the lasting period is long.

To further illustrate the present invention, the following examples are provided to describe in detail an attractant capable of attracting both female and male rice leaf rollers and its application, but they should not be construed as limiting the scope of the present invention.

Example 1

The rice leaf roller attractant is composed of the following raw materials in parts by weight: 41.5 parts of phenylacetaldehyde, 36.5 parts of benzyl acetate, 5.2 parts of hexanal and 16.8 parts of heptanol.

Preparation of attractant for cnaphalocrocis medinalis

41.5g of phenylacetaldehyde, 36.5g of benzyl acetate, 5.2g of hexanal and 16.8g of heptanol are mixed to obtain the cnaphalocrocis medinalis attractant.

Example 2

The rice leaf roller attractant is composed of the following raw materials in parts by weight: 38.5 parts of phenylacetaldehyde, 38 parts of benzyl acetate, 12.5 parts of hexanal and 11.2 parts of heptanol.

Preparation of attractant for cnaphalocrocis medinalis

38.5g of phenylacetaldehyde, 38g of benzyl acetate, 12.5g of hexanal and 11.2g of heptanol are mixed to obtain the attractant for the cnaphalocrocis medinalis.

Example 3

The rice leaf roller attractant is composed of the following raw materials in parts by weight: 48.0 parts of phenylacetaldehyde, 30.0 parts of benzyl acetate, 16.5 parts of hexanal and 5.5 parts of heptanol.

Preparation of attractant for cnaphalocrocis medinalis

48.0g of phenylacetaldehyde, 30.0g of benzyl acetate, 16.5g of hexanal and 5.5g of heptanol are mixed to obtain the cnaphalocrocis medinalis attractant.

Example 4

The rice leaf roller attractant is composed of the following raw materials in parts by weight: phenylacetaldehyde 20.0 parts, benzyl acetate 55.0 parts, hexanal 17.3 parts, and heptanol 7.7 parts.

Preparation of attractant for cnaphalocrocis medinalis

20.0g of phenylacetaldehyde, 55.0g of benzyl acetate, 17.3g of hexanal and 7.7g of heptanol were mixed to obtain the attractant for cnaphalocrocis medinalis.

Example 5

The rice leaf roller attractant is composed of the following raw materials in parts by weight: 29.7 parts of phenylacetaldehyde, 42.9 parts of benzyl acetate, 12.7 parts of hexanal and 14.7 parts of heptanol.

Preparation of attractant for cnaphalocrocis medinalis

29.7g of phenylacetaldehyde, 42.9g of benzyl acetate, 12.7g of hexanal and 14.7g of heptanol were mixed to obtain the attractant for the cnaphalocrocis medinalis.

Example 6

The rice leaf roller attractant is composed of the following raw materials in parts by weight: phenylacetaldehyde 33.7 parts, benzyl acetate 44.3 parts, hexanal 18.8 parts and heptanol 3.2 parts.

Preparation of attractant for cnaphalocrocis medinalis

33.7g of phenylacetaldehyde, 44.3g of benzyl acetate, 18.8g of hexanal and 3.2g of heptanol were mixed to obtain the attractant for the cnaphalocrocis medinalis.

Example 7

The rice leaf roller attractant is composed of the following raw materials in parts by weight: 54.8 parts of phenylacetaldehyde, 20.2 parts of benzyl acetate, 15.5 parts of hexanal and 9.5 parts of heptanol.

Preparation of attractant for cnaphalocrocis medinalis

54.8g of phenylacetaldehyde, 20.2g of benzyl acetate, 15.5g of hexanal and 9.5g of heptanol are mixed to obtain the rice leaf roller attractant.

Example 8

The rice leaf roller attractant is composed of the following raw materials in parts by weight: 28.6 parts of phenylacetaldehyde, 48.2 parts of benzyl acetate, 7.7 parts of hexanal and 15.5 parts of heptanol.

Preparation of attractant for cnaphalocrocis medinalis

28.6g of phenylacetaldehyde, 48.2g of benzyl acetate, 7.7g of hexanal and 15.5g of heptanol are mixed to obtain the attractant for the cnaphalocrocis medinalis.

Comparative example 1

A cnaphalocrocis medinalis attractant similar to example 1, the only difference being the substitution of phenylacetaldehyde for benzaldehyde.

Comparative example 2

A cnaphalocrocis medinalis attractant similar to example 1, the only difference being the replacement of benzyl acetate with methyl salicylate.

Comparative example 3

A cnaphalocrocis medinalis attractant similar to example 1, the only difference being the replacement of hexanal with cis-3-hexenal.

Comparative example 4

A cnaphalocrocis medinalis attractant similar to example 1, the only difference being the substitution of heptanol for linalool.

Comparative example 5

A cnaphalocrocis medinalis attractant similar to example 1, except that the attractant was prepared by: 63g of phenylacetaldehyde, 10.5g of benzyl acetate, 15.0g of hexanal and 11.5g of heptanol are mixed to obtain the rice leaf roller attractant.

Comparative example 6

A cnaphalocrocis medinalis attractant similar to example 1, except that the attractant was prepared by: 13g of phenylacetaldehyde, 65g of benzyl acetate, 9.8g of hexanal and 12.2g of heptanol are mixed to obtain the cnaphalocrocis medinalis attractant.

Application example 1

A method for trapping rice leaf rollers comprises the following steps: 250mg of the cnaphalocrocis medinalis attractant prepared in the example 1 is dissolved in 0.25mL of liquid paraffin, then the cnaphalocrocis medinalis attractant is loaded in a piece of disorientation silk, and the disorientation silk is fixed in a special trap for the cnaphalocrocis medinalis and is used for trapping imagoes of the cnaphalocrocis medinalis.

Application example 2

A trapping method similar to that of application example 1, except that the cnaphalocrocis medinalis attractant prepared in example 2 was used.

Application example 3

A trapping method similar to that of application example 1, except that the cnaphalocrocis medinalis attractant prepared in example 3 was used.

Application example 4

A trapping method similar to that of application example 1, except that the cnaphalocrocis medinalis attractant prepared in example 4 was used.

Application example 5

A trapping method similar to that of application example 1, except that the cnaphalocrocis medinalis attractant prepared in example 5 was used.

Application example 6

A trapping method similar to that of application example 1, except that the cnaphalocrocis medinalis attractant prepared in example 6 was used.

Application example 7

A trapping method similar to that of application example 1, except that the cnaphalocrocis medinalis attractant prepared in example 7 was used.

Application example 8

A trapping method similar to that of application example 1, except that the cnaphalocrocis medinalis attractant prepared in example 8 was used.

Comparative example 7

A trapping method similar to that of application example 1, with the only difference that the cnaphalocrocis medinalis attractant was the cnaphalocrocis medinalis attractant prepared in comparative example 1.

Comparative example 8

A trapping method similar to that of application example 1, except that the cnaphalocrocis medinalis attractant was the cnaphalocrocis medinalis attractant prepared in comparative example 2.

Comparative example 9

A trapping method similar to that of application example 1, except that the cnaphalocrocis medinalis attractant was the cnaphalocrocis medinalis attractant prepared in comparative example 3.

Comparative example 10

A trapping method similar to that of application example 1, except that the cnaphalocrocis medinalis attractant was the cnaphalocrocis medinalis attractant prepared in comparative example 4.

Comparative example 11

A trapping method similar to that of application example 1, except that the cnaphalocrocis medinalis attractant was the cnaphalocrocis medinalis attractant prepared in comparative example 5.

Comparative example 12

A trapping method similar to that of application example 1, except that the cnaphalocrocis medinalis attractant was the cnaphalocrocis medinalis attractant prepared in comparative example 6.

Application example 9

In 2019, the luring effect test of various formula combinations on the attractant of the rice leaf roller is carried out in Wucheng district Tangxi Town in Jinhua City, Zhejiang province between 7 and 15 and 8 and 1.

The method comprises the steps of combining phenylacetaldehyde, benzyl acetate, hexanal and heptaldehyde according to the same weight (5 g each) to prepare an attractant according to the table 1, mixing different attractants in the table 1 and liquid paraffin according to the proportion of 250mg:0.25mL, loading the mixture into a piece of isotropic silk, and fixing the piece of isotropic silk in a special trap for cnaphalocrocis medinalis guenee to trap adults.

A piece-connected rice field with the consistent rice variety, growth vigor and fertilizer and water management conditions and the area of 50 mu is selected as a test field, traps containing different formula combination attractants prepared according to the formula in the table 1 are placed in the test field, 5d investigation is carried out once, and the total quantity of noctuids, snout moth's larva and rice leaf rollers in the trapping cage is counted. The results of the investigation are shown in Table 1.

TABLE 1 major moth traps trapped by different formulation combinations and their total number of traps (unit: head/cage)

Compound combination	Noctuids	Moth of borer	Leaf roller of rice leaf roller	Total up to
					Phenylacetaldehyde	45	31	5	81
Acetic acid benzyl ester	67	23	3	93
					Phenylacetaldehyde + benzyl acetate	345	298	62	705
Hexanal	2	12	16	30
					Heptanal	6	27	21	54
Hexyl aldehydeHeptanal	5	45	33	83
					Phenylacetaldehyde, benzyl acetate and hexanal	323	226	356	905
Phenylacetaldehyde, benzyl acetate and heptanal	321	345	404	1070
					Phenylacetaldehyde, benzyl acetate, hexanal, heptanal	77	45	974	1096

As can be seen from table 1, the single floral components phenylacetaldehyde and benzyl acetate have broad-spectrum attractant activity for lepidoptera insects, and attract noctuids and stem borers, wherein the rice leaf rollers are few; when the phenylacetaldehyde and the benzyl acetate are combined, the synergistic effect is achieved, the insect trapping amount is obviously increased, but the insect trapping amount is also broad-spectrum type, and the rice leaf rollers account for a lower proportion; the single green leaf substances of hexanal and heptanal have low insect-attracting activity, but the ratio of the attracted cnaphalocrocis medinalis is higher than that of the floral component, and when the hexanal and the heptanal are combined, the insect-attracting amount is improved but is not obvious; when the three components of phenylacetaldehyde, benzyl acetate and hexanal and the three components of phenylacetaldehyde, benzyl acetate and heptaldehyde are combined, the total insect trapping amount and the insect trapping amount of the rice leaf rollers are obviously improved, the coordination and synergism effects are obvious, but the specificity to the rice leaf rollers is not strong; when the four components of phenylacetaldehyde, benzyl acetate, hexanal and heptanal are combined, the specificity to the rice leaf roller is obviously improved, and the coordination and synergism effect is the best.

Application example 10

The test of the trapping effect of the attractant for the rice leaf roller is carried out between 1 day 7 and 30 days 8 months in 2020 by tea villages in Jiashan county, Wen Bo Ninghai City, Gastringhai City, Gaoqian, Jiangxing City, and Wenzhou City.

The continuous rice field with the area of 200 mu and consistent rice variety, growth and fertilizer and water management conditions is selected as a test field, traps in the trapping methods of application examples 1-8 and comparative examples 7-12 are placed in the test field, 10 points are uniformly and randomly arranged, and a commercial sex attractant (a rice leaf roller sex attractant disorientation silk-trap core provided by Ningbo biotechnology Limited) is used as a control group. Changing the lure every 15 days for 1 time, and investigating the quantity, the male-female ratio, the hybrid moths and the beneficial insects (natural enemies such as pollinating insects, parasitic bees and the like) of the cnaphalocrocis medinalis in the trapping cage once a week. The survey was continued for two months and the average of 8 surveys was taken and shown in tables 2 and 3.

TABLE 2 attraction effect of different Cnaphalocrocis medinalis attractant on Cnaphalocrocis medinalis imagoes

TABLE 3 insect-attracting amounts of different Cnaphalocrocis medinalis attractants to heteroworms and useful insects in paddy field and their ratio in total insect-attracting amount

As can be seen from Table 2, the attractant for cnaphalocrocis medinalis provided by the invention has the insect attracting amount more than 10 times that of the control group, the proportion of the trapped female cnaphalocrocis medinalis is more than 50%, and the control group can only trap male moths. According to the test data of the comparative examples 7-10, when one of the attractant components is replaced, the insect trapping amount is obviously reduced, the average insect trapping amount of the comparative examples 7-10 is only 48.4% of the average insect trapping amount of the application example 1, meanwhile, the proportion of the trapped female insects is also obviously reduced, and the female insect rate is reduced to 41.0%. As can be seen from the test data of the comparative examples 11 and 12, the low or high ratio (less than 20% or more than 55%) of phenylacetaldehyde and benzyl acetate in the flower fragrance ingredient of the attractant formula leads to the attracting effect lower than that of the invention, the average attracting amount of the comparative examples 11 and 12 is only 34.7% of that of the application examples 1-8, meanwhile, the ratio of the trapped female insects is also obviously reduced, and the female insect rate is reduced to 40.6%. Therefore, the attractant provided by the invention can simultaneously attract a large number of male moths and female moths of the rice leaf rollers, and has higher control efficiency for reducing the number of field rice leaf roller adults and reducing the population density of offspring insects than the current commercial rice leaf roller sex attractant. Meanwhile, the attractant provided by the invention has high trapping activity, and can improve the prediction accuracy of the emergence period of the rice leaf rollers.

As can be seen from Table 3, when one of the attractant components is replaced (comparative examples 7-10) or the proportion of the floral component is too large or too small (comparative examples 11 and 12), the specificity of the attractant to the cnaphalocrocis medinalis is greatly reduced, the moth-attracting amount of the cnaphalocrocis medinalis is greatly reduced, and the attracting amounts of the heteromoths and the beneficial insects are remarkably improved. The rice leaf roller attractant provided by the invention has strong specificity, the rate of the mixed moths in the attracted insects is low, the harm to beneficial insects is small, and the larva amount of the mixed moths and the beneficial insects in application examples 1-8 accounts for only 5% of the average value of the total attracted insects.

In conclusion, the invention not only can simultaneously attract male moths and female moths of the rice leaf rollers, but also has attracting effect obviously superior to that of the conventional sex attractant by compounding and using the phenylacetaldehyde, the benzyl acetate, the hexanal and the heptanol in proper proportion. In addition, the method for trapping rice leaf rollers provided by the invention has the advantages of strong specificity, no resistance, no harm to natural enemies, no toxicity to people and livestock and environmental friendliness; the stress resistance is strong, and the wind, the rain and the sunshine are not afraid; meanwhile, the preparation is simple, the use is simple, and the lasting period is long.

Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.