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Method for preparing aqueous formulation for controlling melon powdery mildew using prostrate spurge extract

An extract and powdery mildew technology, applied in the field of pesticides, can solve the problems of low extraction efficiency and high production cost, and achieve the effects of good control effect, simple extraction process and easy artificial cultivation.

Inactive Publication Date: 2006-06-21
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

During the search, it was also found that the Chinese Patent Publication No. CN1401247, the patent name "a Chinese herbal medicine preparation for the treatment of plant powdery mildew and its preparation method", the patent mentions Phellodendron Phellodendri, Sophora Sophorae, Zanthoxylum bungeanum, Scutellaria barbata, Hedyotis diffusa and The Chinese herbal medicine preparation composed of dandelion for the treatment of plant powdery mildew is prepared by water decoction, the production cost is relatively high, and the extraction efficiency is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The percentage by weight of the aqueous agent for controlling melon powdery mildew: 0.5% of the extract of Radix Kamba, and 99.5% of distilled water.

[0015] Weigh 100g of Dijin powder (10 mesh particles), extract twice at room temperature with 500ml of 25% ethanol, each time for 24 hours, concentrate under reduced pressure and recover the solvent to obtain 7.4g of extract extract; use ultrasonic waves to shake the extract extract with 100ml distilled water Dissolve, extract 6 times with an equal volume of n-butanol, take the extracted lower layer aqueous phase and concentrate it to dryness under reduced pressure to obtain 5.5 g of the extract, dissolve the extract with 1100 ml of distilled water and filter, and prepare a water solution with a concentration of 0.5%; The in vitro drug effect test on melon powdery mildew was carried out by using the leaf disc method, and the control effect reached 76.93%.

Embodiment 2

[0017] The water agent for controlling powdery mildew of melons has the following percentages by weight: 2% of Radix Kamba extract and 98% of distilled water.

[0018] Weigh 100 g of Dijin powder (30 mesh particles), extract 3 times with 1000 ml of 75% ethanol at room temperature, each time for 24 hours, concentrate under reduced pressure and recover the solvent to obtain 8.4 g of extract extract; use ultrasonic waves to shake the extract extract with 100 ml distilled water Dissolve, extract 6 times with an equal volume of n-butanol, take the extracted lower layer aqueous phase and concentrate it to dryness under reduced pressure to obtain 6.2 g of the extract, dissolve the extract with 310 ml of distilled water and filter, and prepare a water solution with a concentration of 2%; The indoor pot experiment was used to conduct the in vivo drug efficacy test on melon powdery mildew, and the control effect reached 68.5%.

Embodiment 3

[0020] The water agent for controlling powdery mildew of melons has the following weight percentages: 5% of Radix Kamba extract and 95% of distilled water.

[0021] Weigh 100g of Dijin powder (50 mesh particles), extract 4 times with 2000ml of 100% ethanol at room temperature, each time for 24 hours, concentrate and recover the solvent under reduced pressure to obtain 9.6g of extract extract; use ultrasonic waves to shake the extract extract with 100ml distilled water Dissolve, extract 6 times with an equal volume of n-butanol, take the extracted lower layer aqueous phase and concentrate it to dryness under reduced pressure to obtain 7.0 g of the extract, dissolve the extract with 140 ml of distilled water and filter, and prepare an aqueous solution with a concentration of 5%; The efficacy test of melon powdery mildew was carried out by field plot test, and the control effect reached 47.35%.

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Abstract

The present invention belongs to the field of farm chemical technology, and is preparation process of gourd powdery mildew controlling water preparation with humid euphorbia extract. The gourd powdery mildew controlling water preparation includes humid euphorbia extract 0.5-5 wt% except water. The preparation process includes the following steps: crushing dried humid euphorbia, room temperature extracting via adding alcohol in 5-20 times and filtering to obtain alcohol extract liquid of humid euphorbia; decompression concentrating the extract liquid to obtain humid euphorbia extractum; and adding distilled water in the same weight as the humid euphorbia powder, ultrasonic dissolution, extracting with n-butanol in the same volume, taking the lower layer of water phase liquid, concentration to dry and obtain humid euphorbia extract, and dissolving in distilled water to obtain the water preparation. The present invention has the features of low cost, effective extraction, no environmental pollution and no residue.

Description

technical field [0001] The invention relates to a preparation method in the technical field of pesticides, in particular to a method for preparing an aqueous agent for controlling powdery mildew of melons by using the extract of Radix chinensis. Background technique [0002] Powdery mildew of melons is a common disease of protected sweet melons. Its onset is early and the loss is heavy, especially in the middle and late stages of greenhouse melon growth. At present, the agents used to control melon powdery mildew are mainly sterol inhibitors (EBIs), β-methoxyacrylates, phenoxyquinolines and so on. However, due to the high reproductive rate of powdery mildew bacteria, and multiple generations can be reproduced in one epidemic season, the number of bacterial populations is astonishing and the heterogeneity is high. In addition, systemic fungicides all act in a single-point mode, so the pathogens are under the selection pressure of agents. It is very easy to produce drug resi...

Claims

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Application Information

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IPC IPC(8): A01N65/18A01P3/00
Inventor 代光辉金素心
Owner SHANGHAI JIAO TONG UNIV
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