Preparation of environment-friendly crop insect-expelling and insect-killing emulsion

Abstract

An insect expelling and killing emulsion for crops is prepared from radix stemonae, sulfur, lemon leaves, szechwan chinaberry fruits, Chinese wampee leaves, common cnidium fruits, brucea javanica, vegetable oil, sodium carbonate, table salt and ethanol as raw materials through extraction and self-emulsification. The insect-repelling and insect-killing emulsion is low in raw material cost, simple in preparation process and good in insect-repelling and insect-killing effect. The insect expelling and killing emulsion disclosed by the invention has the effects of expelling and killing harmful insects by adopting effective components, and also has the effect of killing insects by utilizing an insect adhesion mechanism, an oxygen isolation mode and high osmotic pressure of a saline solution. The application of the insect-repelling and insect-killing emulsion can prevent toxic pesticide residues from harming the human body and the environment.

Description

Technical Field

[0001] This invention belongs to the field of agricultural technology, and specifically refers to an environmentally friendly insect repellent and pesticide that is sprayed on the surface of crops. Technical Background

[0002] Traditional pesticides are highly toxic and persistent, leading to excessive pesticide residues in some harvested crops and prolonged toxicity in humans and animals. This can also pollute soil, water, and air, causing direct or indirect harm to the environment and humans. With societal progress, people are increasingly aware of health and environmental protection, and the development of green and pollution-free food has become a widespread consensus. Currently, some crop repellents made from plant materials have emerged in China. For example, invention patent CN105123760A discloses an insect repellent made from herbal ingredients, including garlic, mugwort, and wormwood. While this repellent has some effect on repelling harmful insects, its effectiveness is weak. For instance, it cannot directly kill soft-bodied insects like snails, and its repellent effect is short-lived. Summary of the Invention

[0003] The purpose of this invention is to prepare an insect-repellent and insecticidal emulsion for crops. This emulsion, when sprayed onto plant surfaces and insects, has a repellent and killing effect on pests. The invented insect-repellent and insecticidal emulsion, after being sprayed onto plants and insects, produces the following effects: first, it repels insects; second, it has a strong killing effect on some insects; third, it adheres to insects; and fourth, it isolates insects or insect eggs from oxygen.

[0004] The technical solution of this invention is as follows: An insect repellent and insecticidal emulsion suitable for common crops comprises the following substances or a portion thereof: Stemona japonica, sulfur, lemon leaves, Melia toosendan, Cinnamomum cassia, Brucea javanica, vegetable oil, soda ash, and salt.

[0005] The principle behind the insect-repelling and insect-killing emulsion of this invention is as follows: After being sprayed onto the surface of plants and insects, the emulsion, due to its natural components that repel and kill insects, has an insect-repelling and insect-killing effect. Furthermore, because the emulsion forms a thin film on the surface of plants, insects, and insect eggs, it can create an air barrier, leading to oxygen deprivation and death of insects and eggs. It can also form an adhesive film that adheres to and kills small insects. Additionally, it can cause snails and other soft-bodied insects to die directly from dehydration due to the high osmotic pressure of salt. The multiple mechanisms of action of the invented emulsion against harmful insects result in good insect-repelling and insect-killing effects.

[0006] The raw materials used in this invention do not contain toxic pesticide components and are mainly derived from natural herbs and minerals. They leave no residue after use and do not cause harm to the human body or the environment.

[0007] The emulsion of this invention has a good and long-lasting ability to repel and kill pests on common crops, and has a significant killing effect on harmful insects and insect eggs.

[0008] The insect repellent and insecticidal emulsion of the present invention is inexpensive and the raw materials are readily available.

[0009] The insect repellent and insecticidal emulsion of this invention is simple to use. Simply add a small amount of water to disperse it, then spray it onto the plant surface. After one application to a dry plant surface, it can maintain good insect repellent and insecticidal effects for more than 7 days, provided there is no rain.

[0010] Preparation process: Step 1: Heat and stir room temperature liquid vegetable oil in the air for several hours; Step 2: Stir the sulfur in anhydrous ethanol to form a saturated solution; Step 3: Take a certain amount of Stemona japonica, lemon leaves, Melia toosendan, Scutellaria baicalensis, Cnidium monnieri, and Brucea javanica, stir and heat them in water to obtain an herbal aqueous solution; Step 4: Add the vegetable oil obtained in Step 1 to the alcohol solution in Step 2 and stir to disperse; Step 5: Add an appropriate amount of soda ash to the solution from step 4 and stir to disperse. Step 6: Add the herbal aqueous solution from Step 3 to the solution obtained in Step 5 and stir. Step 7: Add salt to the emulsion from step 6 and stir to disperse, thus obtaining the finished emulsion. Detailed Implementation

[0011] To make the objectives, technical solutions, and advantages of the invention clearer, the following description is provided in conjunction with embodiments. The described embodiments are some, but not all, of the embodiments of the invention.

[0012] Example 1

[0013] Prepare the following ingredients by weight: 20 parts of Stemona japonica, 3 parts of sulfur, 20 parts of lemon leaves, 20 parts of Melia toosendan, 30 parts of Scutellaria baicalensis leaves, 10 parts of Cnidium monnieri, 15 parts of Brucea javanica, 50 parts of vegetable oil, 4 parts of soda ash, 10 parts of salt, 20 parts of anhydrous ethanol, and 80 parts of deionized water.

[0014] The ingredients, including Stemona japonica, lemon leaves, Melia toosendan, Cinnamomum cassia, Cnidium monnieri, and Brucea javanica, are pulverized. After pulverization, the fiber diameter and powder particle size are less than 200 micrometers. The sulfur in question is sulfur powder with a particle size of less than 30 micrometers; The preparation steps are as follows: Step 1: Heat room temperature liquid vegetable oil to 150°C in air and stir for 4 hours, then cool to room temperature; Step 2: Stir the sulfur in anhydrous ethanol to form a mixture of saturated sulfur solution and sulfur powder; Step 3: Take the above-mentioned Stemona japonica, lemon leaves, Melia toosendan, Scutellaria baicalensis leaves, Cnidium monnieri and Brucea javanica, stir and soak in water for 30 minutes, then heat to 90°C and stir for 30 minutes to obtain herbal extract aqueous solution; Step 4: Add the vegetable oil obtained in Step 1 to the alcohol-sulfur mixture in Step 2, and stir thoroughly to disperse. Step 5: Add soda ash to the mixture from step 4 and stir to disperse; Step 6: Add the herbal aqueous solution from Step 3 to the solution obtained in Step 5 and stir. Step 7: Add salt to the emulsion from step 6 and stir to disperse, thus obtaining the finished emulsion.

Claims

1. An environmentally friendly surface insect repellent and pesticide for crops, characterized in that: It is prepared by extraction and emulsification of Stemona japonica, sulfur, lemon leaves, Melia toosendan, Cinnamomum cassia, Brucea javanica, vegetable oil, soda ash, salt and ethanol.

2. An insect repellent and insecticidal emulsion according to claim 1, characterized in that... By weight: 15 parts of Stemona japonica, 2 parts of sulfur, 20 parts of lemon leaves, 25 parts of Melia toosendan, 20 parts of Scutellaria baicalensis leaves, 10 parts of Cnidium monnieri, 10 parts of Brucea javanica, 40 parts of vegetable oil, 4 parts of soda ash, 15 parts of salt, 20 parts of anhydrous ethanol and 80 parts of deionized water.

3. An insect repellent and insecticidal emulsion according to claim 1, characterized in that... By weight: 20 parts of Stemona japonica, 3 parts of sulfur, 20 parts of lemon leaves, 20 parts of Melia toosendan, 30 parts of Scutellaria baicalensis leaves, 10 parts of Cnidium monnieri, 15 parts of Brucea javanica, 50 parts of vegetable oil, 4 parts of soda ash, 10 parts of salt, 20 parts of anhydrous ethanol, and 80 parts of deionized water.

4. An insect repellent and insecticidal emulsion according to claim 1, characterized in that... By weight: 10 parts of Stemona japonica, 3 parts of sulfur, 25 parts of lemon leaves, 30 parts of Melia toosendan, 30 parts of Scutellaria baicalensis leaves, 15 parts of Cnidium monnieri, 20 parts of Brucea javanica, 50 parts of vegetable oil, 5 parts of soda ash, 15 parts of salt, 25 parts of anhydrous ethanol, and 80 parts of deionized water.

5. An insect repellent and insecticidal emulsion according to claims 2-4, characterized in that: The vegetable oil is a liquid vegetable oil and needs to be heated and stirred in air at a temperature above 120°C for more than 4 hours.

6. An insect repellent and insecticidal emulsion according to claims 2-4, characterized in that: Stemona japonica, lemon leaves, Sichuan pepper, yellow peel leaves, Cnidium monnieri, and Brucea javanica need to be pulverized to a fiber diameter and powder particle size of less than 200 micrometers.

7. An insect repellent and insecticidal emulsion according to claims 2-4, characterized in that: Stemona japonica, lemon leaves, Sichuan pepper, yellow peel leaves, Cnidium monnieri, and Brucea javanica are extracted in water with stirring at a temperature below 100°C.