An attractant composition for controlling spodoptera frugiperda and use thereof

Abstract

The application belongs to the field of pesticides, and particularly relates to an attractant composition for preventing and treating Spodoptera frugiperda. The attractant composition for preventing and treating Spodoptera frugiperda is composed of the following components in parts by weight: sex pheromone 6-19 parts by weight and plant volatile 300-900 parts by weight; wherein the sex pheromone is composed of cis-9-tetradecenyl acetate, 7-dodecene acetate and cis-11-hexadecenyl acetate; and the plant volatile is composed of ethyl acetate, ethyl linalyl acetate and limonene. The attractant composition of the application is high in safety, free of any toxic side effects, easy to degrade, good in the prevention and treatment effect on Spodoptera frugiperda, reduces the use amount of chemical pesticides, reduces the pesticide residue of fruits, and reduces the impact on the ecological environment.

Description

Technical Field

[0001] The present invention belongs to the field of pesticides, and in particular relates to an attractant composition for preventing and controlling fall armyworm and an application thereof. Background Art

[0002] The fall armyworm, a member of the genus Spodoptera in the family Noctuidae of the order Lepidoptera, is a polyphagous, migratory pest native to tropical and subtropical America. Its invasion and outbreak were first reported in Nigeria and Ghana in Africa in 2016, and the pest quickly spread to more countries. In January 2019, it was discovered in Yunnan, my country, and subsequently migrated to several provinces and regions, causing damage to crops such as corn, wheat, and sorghum, becoming a major pest that poses a serious threat to my country's agricultural development.

[0003] The fall armyworm, also known as the fall armyworm, is characterized by its high reproductive capacity, wide adaptability, explosive destructiveness, and rapid spread. A polyphagous pest, it consumes 353 host species across 76 families, including corn, sorghum, wheat, barley, rice, soybeans, peanuts, cotton, sugar beets, and alfalfa. Currently, the predominant type of fall armyworm confirmed to have invaded my country is the corn-type.

[0004] Fall armyworm larvae have six instars, with the sixth instar causing the most serious damage. On corn, younger larvae feed on leaves, creating translucent "windows" in the film. Older larvae feed on leaves, creating irregular, long holes. They can even severely damage newly emerged leaves, leaving them in a tattered state. They also feed on the tassels and young ears of corn.

[0005] While common methods for controlling the fall armyworm include agricultural, biological, and chemical control, chemical pesticides remain the primary method. Available pesticides include bacteriocins, chlorfenapyr, triflumuron, flubendiamide, acephate, cyfluthrin, chlorpyrifos, diflubenzuron, and spinetoram. Irrational use of pesticides can also lead to resistance in the fall armyworm to some commonly used pesticides.

[0006] Using plant volatiles as synergists to enhance the trapping effectiveness of insect pheromones and improve the efficiency of biological control has become a research trend. To reduce the use of chemical pesticides, attractants have been synthesized and formulated based on the odors of sex pheromones, host plant volatiles, and other food sources for the green control of fall armyworms. These attractants effectively trap target insects, are highly targeted, effective, and have minimal negative impacts. Summary of the Invention

[0007] The present invention aims to provide an attractant composition for controlling fall armyworm and its application. The specific technical solution is as follows:

[0008] An attractant composition for controlling fall armyworm comprises the following components in parts by weight: 6-19 parts of sex pheromones and 300-900 parts of plant volatiles; the sex pheromones are composed of cis-9-tetradecene acetate, 7-dodecene acetate and cis-11-hexadecene acetate; and the plant volatiles are composed of ethyl acetate, leaf acetate and limonene.

[0009] Preferably, the weight ratio of cis-9-tetradecene acetate, 7-dodecene acetate and cis-11-hexadecene acetate in the sex pheromone is 5-15:0.5-2:0.5-2;

[0010] Preferably, the weight ratio of ethyl acetate, leaf acetate and limonene in the plant volatiles is 100-300:100-300:100-300.

[0011] More preferably, the weight ratio of cis-9-tetradecene acetate, 7-dodecene acetate and cis-11-hexadecene acetate is 9:1:1; and the weight ratio of ethyl acetate, leaf acetate and limonene is 200:200:200.

[0012] The attractant composition is used for preventing and detecting the crop pest fall armyworm, in particular for use in corn fields.

[0013] Compared with the prior art, the present invention achieves the following beneficial technical effects:

[0014] The attractant composition of the present invention is highly safe, has no toxic side effects, is easily degraded, and has a good control effect on fall armyworm. At the same time, it reduces the use of chemical pesticides, reduces pesticide residues in fruits, and reduces the impact on the ecological environment.

[0015] The attractant composition of the present invention is highly safe, has no toxic side effects, is easily degraded, and has a good control effect on fall armyworm. At the same time, it reduces the use of chemical pesticides, reduces pesticide residues in fruits, and reduces the impact on the ecological environment. DETAILED DESCRIPTION

[0016] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

[0017] The present invention will be further explained below with reference to specific embodiments.

[0018] Example 1Field attraction effect of attractant composition on Spodoptera exigua

[0019] Test site profile: In the corn field of Shilin County, Kunming City, Yunnan Province, the test site is flat, and the soil fertility is medium; the corn fields are concentrated and contiguous, and the field management is consistent, with good irrigation facilities. The corn fields are at the 4-5 leaf stage, with a plant height of 30-40 cm, a row spacing of 50 cm, and a plant spacing of 30 cm, and the corn growth is basically consistent.

[0020] The tested agents are shown in Table 1 below.

[0021] Table 1 Formulation of attractant composition

[0022]

[0023] Test method: The attractant composition was dissolved in dichloromethane at a mass ratio of 1:10, and was quantitatively added to a polyethylene slow-release bottle for low-temperature storage. The amount of attractant composition used in the test was 300 μg per lure core. The trap used was a triangular sticky moth trap; the suspension height of the trap was 30 cm, the distance between traps was 15 m, and the traps were arranged completely randomly. The number of insects attracted to each trap was recorded and removed on the 10th, 20th, 30th, and 40th day after the start of the test; the agent was replaced every 10 days.

[0024] The test results are shown in Table 2 below.

[0025] Table 2 Field attraction effect of attractant composition on Spodoptera exigua

[0026]

[0027]

[0028] As shown in Table 2, the attractant effect of Formula 4 on Spodoptera exigua was the best, with a total of 75 heads; the attractant effects of Formulas 2-3, 5-7 on Spodoptera exigua were second, with a total of 40-47 heads; and the attractant effects of Formulas 1 and 8 on Spodoptera exigua were relatively poor.

[0029] Comparing Formula 4 with Formulas 1-3, 5-8, it can be seen that different combinations of linalool, ethyl acetate, acetic acid leaf alcohol ester, α-pinene and limonene in the attractant have a greater impact on the attractant effect. The combination of ethyl acetate, acetic acid leaf alcohol ester and limonene with pheromone can significantly improve the attractant effect of the attractant.

[0030] Example 2 Field attraction effect of attractant composition on Spodoptera exigua

[0031] Test site profile: In the corn field of Yiliang County, Yunnan Province, the test site is flat, and the soil fertility is medium; the corn fields are at a plant spacing of 30 cm, and the corn growth is basically consistent.

[0032] Test agent:

[0033] Table 3 Attractant composition formula

[0034]

[0035]

[0036] Test Method: Dissolve the attractant composition in dichloromethane at a mass ratio of 1:10, add a quantitative amount to a polyethylene sustained-release bottle, and store at low temperature until needed. The attractant composition was used at a dosage of 300 μg per lure. Triangular sticky traps were used; the traps were hung at a height roughly equivalent to the height of the corn, spaced 15 meters apart, and randomly arranged. The number of insects trapped in each trap was recorded and removed on days 10, 20, 30, and 40 of the experiment. The agent was replaced every 10 days.

[0037] The test results are shown in Table 4 below.

[0038] Table 4 Field attractant effect of attractant composition on fall armyworm

[0039]

[0040] As shown in Table 4, formula 4 has the best attracting effect on fall armyworm, with a total number of 99 attracted heads; formulas 9, 11, and 12 have the second best attracting effect on fall armyworm, with a total number of 80-88 attracted heads; formulas 10 and 13 have relatively poor attracting effects on fall armyworm.

[0041] Comparing Formula 4 with Formulas 9-13, it can be seen that different ratios of ethyl acetate, leaf acetate and limonene in the attractant will have a relatively large impact on the attractant effect. The mass ratio of ethyl acetate, leaf acetate and limonene is (1-3): (1-3): (1-3). The combination and combination with sex pheromones can significantly enhance the attractant effect.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same.

Claims

1. An attractant composition for controlling fall armyworm, characterized in that: The invention comprises the following components in parts by weight: 6-19 parts by weight of sex pheromones and 300-900 parts by weight of plant volatiles; wherein the sex pheromones are composed of cis-9-tetradecene acetate, 7-dodecene acetate and cis-11-hexadecene acetate; and the plant volatiles are composed of ethyl acetate, leaf acetate and limonene; the weight ratio of cis-9-tetradecene acetate, 7-dodecene acetate and cis-11-hexadecene acetate is 5-15:0.5-2:0.5-2; and the weight ratio of ethyl acetate, leaf acetate and limonene is 100-300:100-300:100-300.

2. The attractant composition according to claim 1, characterized in that The weight ratio of cis-9-tetradecene acetate, 7-dodecene acetate and cis-11-hexadecene acetate is 9:1:1; the weight ratio of ethyl acetate, leaf acetate and limonene is 200:200:

200.

3. Use of the attractant composition according to any one of claims 1-2 for the prevention and detection of the crop pest Spodoptera frugiperda.

4. The use according to claim 3, characterized in that Used to control fall armyworm in corn fields.

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