Diisotropic agent for interfering mating of prodenia litura and application

Abstract

The invention discloses a disorientation agent for interfering mating of prodenia litura and application, and belongs to the technical field of prevention and control of agricultural pest prodenia litura. The component of the prodenia litura isotropic agent is cis-11-hexadecene-1-ol-2, 2, 2-trifluoroacetate, and the isotropic effect of the prodenia litura isotropic agent is superior to that of prodenia litura pheromone isotropic products under the same dosage. According to the isotropic agent, 100-200 mg of cis-11-hexadecene-1-ol-2, 2, 2-trifluoroacetic acid ester is dissolved in liquid chlorinated paraffin and added into a polyvinyl chloride (PVC) capillary tube, 30-60 isotropic filaments are arranged per mu, the field lasting period is longer than 3 months, and the isotropic rate is larger than 85%. The isotropic agent disclosed by the invention can obviously interfere with the mating between male and female prodenia litura, is safe to the environment and natural enemies, is simple to operate, can be used for preventing and treating the pests in a large area, and has important significance on comprehensive treatment of the prodenia litura.

Description

Technical Field

[0001] The invention relates to the technical field of agriculture, and in particular to an aversion agent for interfering with the mating of Spodoptera litura and an application thereof. Background Art

[0002] Spodopteralitura belongs to the order Lepidoptera, family Noctuidae. It is a omnivorous and voracious agricultural pest distributed worldwide, distributed in Asia, Europe and Africa. It is widely distributed in my country, especially in the Yellow River Basin and the Yangtze River Basin. Studies have reported that Spodoptera litura has a omnivorous diet and likes to eat vegetables, grain crops, flowers, fruit trees, tobacco, tea, forage and other 109 families and nearly 390 species of plants. Adults are active at night, have strong flying ability, and are phototactic and chemotactic. The insect has 4 to 6 generations per year, and in some areas it can be as high as 7 to 8 generations, and the generations overlap seriously, which increases the difficulty of field investigation and prevention. At present, chemical pesticides are still an important means of preventing and controlling Spodoptera litura, but with the long-term and large-scale use of chemical pesticides, Spodoptera litura has developed varying degrees of resistance to a variety of pesticides. Therefore, green, safe and efficient technologies are urgently needed to prevent and control Spodoptera litura.

[0003] Using sex pheromones to control Spodoptera litura is one of the effective measures. Insect sex pheromones come directly from the insect body and will not cause harm to humans and the environment. They are conducive to slowing down the development of insect resistance to chemical pesticides, protecting the species and population of natural enemies in nature, ensuring the quality and safety of the environment and agricultural products, and promoting the sustainable development of agricultural production. As the "third generation of pesticides", insect pheromones have many successful examples of using mating interference and large-scale trapping methods for pest control. At present, the use of disorientation to interfere with the mating between male and female pest moths has become a hot spot for pest control. The principle of disorientation is to use disorienting silk to slowly release a large amount of pheromones or similar components to cover the position of female adults, misleading male adults to find it difficult to find female adults, delaying their mating or preventing them from mating, and significantly reducing the number of effective eggs, which directly leads to a decrease in insect population density, thereby achieving the purpose of control. Summary of the invention

[0004] The purpose of the present invention is to provide a disorienting agent for interfering with the mating of Spodoptera litura and its application.

[0005] A disorienting agent for interfering with the mating of Spodoptera litura, whose component is cis-11-hexadecene-1-ol-2,2,2-trifluoroacetate (PestManagSci2019;75:1045–1055).

[0006] Optionally, the dosage of cis-11-hexadecene-1-ol-2,2,2-trifluoroacetate is 100-200 mg, and 30-60 directional threads are set per acre;

[0007] Preferably, the dosage of cis-11-hexadecene-1-ol-2,2,2-trifluoroacetate is 100-150 mg, and 40-60 directional threads are set per acre;

[0008] Optimally, the dosage of cis-11-hexadecene-1-ol-2,2,2-trifluoroacetate is 150 mg, and 40 directional threads are set per acre;

[0009] The purpose of the present invention is to slowly release cis-11-hexadecene-1-ol-2,2,2-trifluoroacetate into the field through a polyvinyl chloride capillary. When the amount of cis-11-hexadecene-1-ol-2,2,2-trifluoroacetate dispersed in the field air reaches a certain level, the intraspecific chemical communication of Spodoptera litura can be interfered and blocked, thereby reducing the mating rate thereof.

[0010] Field tests show that the disorienting agent of the present invention has an obvious sustained-release effect, and the field duration is more than 3 months. The effective component of the disorienting agent is more than 100 mg, more than 30 disorienting wires are set per mu, and the disorienting rate is higher than 85%.

[0011] The disorienting agent of the invention can significantly interfere with the mating between male and female Spodoptera litura, has a long lasting effect, is safe to the environment and natural enemies, is non-toxic and harmless to humans, is easy to operate, can be used for large-scale prevention and control of the pest, and is of great significance for the comprehensive control of Spodoptera litura. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is the molecular structure formula of cis-11-hexadecene-1-ol-2,2,2-trifluoroacetate. DETAILED DESCRIPTION

[0013] The following examples are used to illustrate the present invention, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.

[0014] Example 1 Preparation of a sustained-release device for disorienting agents

[0015] The slow-release carrier is a polyvinyl chloride capillary (length 20 cm, inner diameter 1.5 mm, wall thickness 0.5 mm), and the solvent is chlorinated paraffin (CP52). 100-200 mg of cis-11-hexadecene-1-ol-2,2,2-trifluoroacetate is dissolved in chlorinated paraffin, mixed evenly to form a mother solution of a certain concentration, and a certain volume of the mother solution is dispensed into the capillary with a pipette, and both ends of the capillary are heat-sealed to prepare a slow-release device for the disorienting agent for Spodoptera litura.

[0016] Example 2 Field Determination of Spodoptera litura Disorientant

[0017] A disorientation test was conducted in tobacco fields in Honghe Prefecture, Yunnan Province. The area of ​​the test field is about 2,000 mu, divided into 5 plots, each plot is divided into a control area and a disorientation area, and each plot is not less than 1,200 meters apart. The effective component of the disorientation agent is 100-200 mg, and 10-60 disorientation threads are set per mu, and the disorientation threads are hung 10-20 cm above the tobacco. To further illustrate the disorientation effect, the sex pheromone components of Spodoptera litura, cis-9, trans-12-tetradecene acetate and cis-9, trans-11-tetradecene acetate, are prepared in a ratio of 60:40, and the dosages are set at 100 mg, 150 mg, and 200 mg.

[0018] Different dosages, placement numbers and mating inhibition rates are shown in the table below.

[0019]

[0020] The test results show that compared with the sex pheromone control, cis-11-hexadecene-1-ol-2,2,2-trifluoroacetate has a significant disorienting effect on Spodoptera litura, and its disorienting effect is better than the pheromone sex pheromone control of Spodoptera litura at the same dose. At the same dose, the disorienting effect is more obvious with the increase of the setting density. When the dose is greater than 150 mg and more than 30 strands are set per mu, the disorienting rate is greater than 90%. In summary, the present invention provides a disorienting agent for interfering with the mating of Spodoptera litura. It is found through the examples that this disorienting agent can interfere with the mating communication between male and female Spodoptera litura. When the dose of cis-11-hexadecene-1-ol-2,2,2-trifluoroacetate is 150 mg and 40 disorienting threads are set per mu, the disorienting rate is greater than 90%, and the disorienting rate is better than the sex pheromone disorienting thread of the same dose. The disorienting agent for Spodoptera litura provided by the invention is safe to the environment and natural enemies, is easy to operate, can be used for preventing and controlling the pest over a large area, and is of great significance for the comprehensive control of Spodoptera litura.

[0021] The above disclosure is only a specific embodiment of the present invention, but the present invention is not limited thereto, and any changes that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A use of a disorienting agent in interfering with the mating of Spodoptera litura, characterized in that: The disorienting agent is cis-11-hexadecene-1-ol-2,2,2-trifluoroacetate.

2. The use according to claim 1, wherein the disorienting agent cis-11-hexadecene-1-ol-2,2,2-trifluoroacetate is dissolved in chlorinated paraffin at a dosage of 100-200 mg, and then added into a polyvinyl chloride capillary, and both ends are sealed to obtain a disorienting agent release device.

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