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Flavonoid agricultural antibacterial compound

A flavonoid compound and chemical technology, applied in the field of pesticides, can solve the problems of excessive pesticide residues, threats to food safety and human health, etc., and achieve the effect of large output, low pressure and rapid reproduction

Inactive Publication Date: 2012-05-23
PESTICIDE INST XIBEI AGRI & FORESTRY TECHUNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because oomycete disease is a re-infectious disease, repeated application of pesticides is required, and a slight improper application technique will lead to excessive pesticide residues in the harvest, thus threatening food safety and human health

Method used

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  • Flavonoid agricultural antibacterial compound
  • Flavonoid agricultural antibacterial compound
  • Flavonoid agricultural antibacterial compound

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] compound separation

[0012] Collect the aboveground part of Echinochloa chinensis, weigh 500g of the dried and crushed plant sample, place it in a 5L round bottom flask, add 3000mL methanol for reflux extraction for 3 hours, filter the supernatant, then add 1000mL methanol for reflux extraction 2 After hours, the supernatant was filtered off, and the filtrates were combined and concentrated under reduced pressure to about 300 mL. The concentrated solution was suspended in 700 mL of water, and then extracted three times with 500 mL of dichloromethane, and the dichloromethane phases were combined and concentrated to near dryness under reduced pressure. The concentrated solution was then transferred to a silica gel column (2.5×75cm), and eluted with petroleum ether / chloroform=9 / 1, 8 / 2, and 7 / 3 (volume ratio) successively, washing 1000mL for each solvent ratio, and A portion of 100 mL was collected to finally obtain 1.5 g of the compound.

Embodiment 2

[0014] Preparation of emulsifiable cream preparations

[0015] Take by weighing 5.0g (purity ≥ 98.0%) of the compound involved in the present invention and dissolve it in 85g methanol, then add anionic surfactant calcium dodecylbenzenesulfonate (DBS-Ca) 3.0g, nonionic surfactant OP -107.0g, stirred until transparent and homogeneous, namely to obtain the emulsifiable concentrate preparation of this compound as an active ingredient, wherein the active ingredient content is 5%.

Embodiment 3

[0017] Experiment on Controlling Cucumber Downy Mildew in Potted Plants

[0018] Cultivate cucumbers (the variety is Xintai Mici) in the greenhouse with nutrient soil, 2 plants per pot, and when the seedlings grow 2 true leaves, select the ones with the same growth for testing. The test agent is the emulsifiable concentrate preparation with 5% active ingredient content, and the contrast agent is 50% dimethomorph water-dispersible granule. Every 10 bowls is 1 treatment, and the test has 4 treatments in total, which are respectively 500 times and 1000 times dilution of the test agent, 2000 times dilution of the control agent and water control, and each treatment is repeated 3 times. 24 hours after spraying, the pathogenic spores of cucumber downy mildew were artificially inoculated, and the control effect was investigated one week after spraying. The results are shown in Table 1.

[0019] Table 1 Pot control test results of the tested EC preparation on cucumber downy mildew

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PUM

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Abstract

The invention provides a flavonoid with agricultural bacteriostatic activity and belongs to the technical field of pesticides. The compound has the following structural formula. The International Union of Pure and Applied Chemistry (IUPAC) chemical name of the compound is E-3-(3-(3,7-dimethyl-2,6-dialkylene)-4-hydroxyphenyl)-5,7-dihydroxyl-4H-benzopyran-4-ketone. The compound has high inhabitation effect on oomycetes selectively and can be processed into a pesticide preparation for preventing and controlling oomycete diseases.

Description

Technical field: [0001] The invention relates to the technical field of pesticides, in particular to the use of a flavonoid compound with antibacterial activity for preventing and treating plant diseases. Background technique: [0002] Oomycete disease is one of the most important diseases of crops such as cucumber, tomato and potato, which generally causes 20%-30% yield reduction, and serious yield reduction can reach more than 50%, or even no harvest. The main technical means currently used to prevent and control oomycete diseases (such as cucumber downy mildew, tomato early blight, potato late blight, etc.) is still chemical control, azoxystrobin, propamocarb, metalaxyl, mancozeb, etc. The main types of fungicides for the prevention and treatment of such diseases. Because oomycete disease is a re-infectious disease, repeated application of pesticides is required, and a slight improper application technique will lead to excessive pesticide residues in the harvest, thereby...

Claims

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Application Information

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IPC IPC(8): C07D311/36A01N43/16A01P3/00
Inventor 魏少鹏吴文君姬志勤
Owner PESTICIDE INST XIBEI AGRI & FORESTRY TECHUNIV
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