A kind of botanical insecticide for preventing and treating corn weevil and its preparation process

A plant-derived insecticide, corn weevil technology, applied in insecticides, plant growth regulators, botanical equipment and methods, etc., can solve the problem of unsatisfactory activity, undetermined active chemical components, insufficient plant resources, etc. problems, to achieve the effect of not easy to drug resistance, environmental friendliness, and abundant plant resources

Active Publication Date: 2018-01-05
LANZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because the plant resources are not abundant enough, or the activity is not very ideal, many studies have failed to obtain further results, and most of them have not determined the active chemical components

Method used

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  • A kind of botanical insecticide for preventing and treating corn weevil and its preparation process
  • A kind of botanical insecticide for preventing and treating corn weevil and its preparation process
  • A kind of botanical insecticide for preventing and treating corn weevil and its preparation process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1 Preparation of different active parts of red clover

[0029] 1. Preparation of red clover extract: collect fresh aboveground parts of red clover plants, dry in the shade, and pulverize. Add 20 times the volume of ethanol, ultrasonically extract for 30 minutes, and repeat the extraction 3 times. Concentrate the extraction solvent under reduced pressure to obtain the extract, and dry it in a ventilated and dark place to obtain the red clover extract.

[0030] 2. Preparation of different active parts of red clover: Take 20g of the obtained red clover extract, dissolve it in 100mL of distilled water with 5 times the volume, add 300mL of petroleum ether 3 times the volume of the aqueous solution into the aqueous solution, vibrate vigorously, and let stand The layers were separated, and the supernatant was the petroleum ether layer; the extraction was repeated 3 times, the petroleum ether layers were combined, and concentrated under reduced pressure to obtain th...

Embodiment 2

[0031] The insecticidal activity of different active parts of embodiment 2 to corn weevil

[0032] The insecticide is ready to be prepared: weigh 10-15 mg of the petroleum ether, ethyl acetate, and different active parts of the water phase prepared above, add respectively acetone solution containing 10% distilled water to prepare a mother liquor with a concentration of 12.5 mg / mL, and then use Dilute the mother liquor with distilled water into 6.25, 3.125, 1.25 and 0.625mg / mL solutions successively, add surfactant JFC (C7-C9 alkanol polyoxyethylene ether) with 1% of the volume of the medicine solution, and mix evenly to obtain the insecticide. The contact effects of different components of insecticides on corn weevils are shown in Table 1.

[0033] From Table 1, we can see that the activity of red trifolium ethyl acetate and aqueous phase is higher than that of petroleum ether. Among them, at 49 μg / cm 2 Under the concentration, after 96h treatment, the contact activity of th...

Embodiment 3

[0036] The tracking separation of embodiment 3 insecticidal active compounds

[0037] The activity results showed that the ethyl acetate part of red trifolium had the strongest activity. Therefore, the ethyl acetate fraction was further isolated and purified. Take 10g of ethyl acetate, mix the sample with 10g of silica gel, put it on a 100g silica gel column, and then use 300mL of petroleum ether, 300mL of petroleum ether: acetone (100:1) solution, 300mL of petroleum ether: acetone (50:1) solution, petroleum ether : Acetone (10: 1) solution 500mL, petroleum ether: acetone (2:1) solution 300mL, petroleum ether: acetone (1:1) solution 300mL, acetone 100mL eluted, compared by thin layer chromatography, combined similar components , A-H 8 components are obtained. Component D was subjected to multiple consecutive silica gel column chromatography separations, purified by Sephadex gel, and recrystallized to obtain the compound FOR. Component E is subjected to multiple consecutive ...

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Abstract

The invention discloses a botanical insecticide for controlling corn weevil, the main component of which is red clover extract. The red clover botanical pesticide provided by the invention not only has obvious contact killing effect on stored grain pests, is beneficial to human health, is also environmentally friendly, and is not easy to produce drug resistance. In addition, the plant is rich in resources and has a simple preparation process, and has good development and application prospects in protecting food security.

Description

technical field [0001] The invention relates to a preparation process of a botanical insecticide for controlling corn weevil and belongs to the technical field of biological pesticides. Background technique [0002] Food is an important strategic material, which plays an important role in economic development, national security and social stability. Among the newly harvested grains in the world every year, the important losses caused by storage pests are about 15%. In some developing countries, because the technical level cannot keep up, the input of manpower and material resources is small, and the early prevention and treatment measures are not timely, the losses caused Up to 25% [1-2]. my country is the most important grain producing and consuming country in the world. In recent years, my country's annual grain output has reached 500 billion kilograms, and the inventory accounts for more than half of the annual output. Stored grain pests not only cause quality loss, but...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A01N65/20A01N43/16A01P7/04
Inventor 刘权彭爱风李晓蓓
Owner LANZHOU UNIVERSITY
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