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Preparation process of botanical insecticide capable of preventing and treating maize weevil

A botanical insecticide and preparation technology, applied in the field of biopesticides, can solve the problems of unsatisfactory activity, insufficient plant resources, and undetermined active chemical components, etc., to achieve resistance to pesticides, abundant plant resources, and environmental friendliness Effect

Active Publication Date: 2015-11-25
LANZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 achieve further results, and most of them have not determined the active chemical components

Method used

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  • Preparation process of botanical insecticide capable of preventing and treating maize weevil
  • Preparation process of botanical insecticide capable of preventing and treating maize weevil
  • Preparation process of botanical insecticide capable of preventing and treating maize weevil

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 20 g of the obtained red clover extract, dissolve it in 100 mL of distilled water with 5 times the volume, add 300 mL 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...

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 above-mentioned petroleum ether, ethyl acetate and different active parts of the water phase, 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 49μg / cm 2 At the same concentration, after 96 hours of treatment, the contact activ...

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-H8 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 si...

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Abstract

The invention discloses a botanical insecticide capable of preventing and treating maize weevil. The main ingredient of the botanical insecticide capable of preventing and treating maize weevil is a trifolium pratense extract. A trifolium pratense botanical pesticide provided by the invention has obvious contact toxicity on stored grain insects, is beneficial to human health, is environment-friendly and is low in pesticide resistance generation possibility. In addition, the botanical insecticide is rich in plant resources and simple in preparation process and has favorable development and application prospects in the aspect of protecting the grain safety.

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 world's most important grain producing and consuming country. 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 also...

Claims

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Application Information

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