Emulsion for killing aphids and red spiders and preparation method thereof

Abstract

The invention discloses emulsion for killing aphid and red spider and its preparation method. The emulsion uses mixed extractum as a main medicine, the mixed extractum comprises ailanthus altissima leaf water extraction extractum, radix sophorae flavescentis alcohol extraction extractum, eucommia ulmoides leaf water extraction extractum and neem bark alcohol extraction extractum with a weight ratio of 1:1:2:2, the emulsion also comprises, in relative to each gram of the main medicine, the following components: 40-50mL of a solvent, 5-15mL of an emulsifier, 0.05-0.15g of an assistant, 1-2mL of a preservative, 5-7.5mL of an antifreeze and 50-100mL of deionized water. The preparation method of the emulsion is as follows: (1) mixing the four extraction extractum according to the ratio, adding the solvent, heating for dissolving to obtain a medicine liquid; (2) adding the emulsifier and the assistant to the medicine liquid, using an ultrasonic emulsification device to obtain primary emulsion; (3) successively adding the preservative, the antifreeze and the deionized water to the primary emulsion, stirring, cooling to room temperature to obtain the emulsion. The emulsion is environmental friendly, stable in quality and good in insecticidal effect, and the preparation method has the advantages of simple operation and ow production cost.

Description

technical field [0001] The invention relates to an emulsion for killing aphids and red spiders and a preparation method thereof, belonging to the technical field of natural plant application. Background technique [0002] The world today is facing four major problems, namely population, food, energy and environment. There are more than 1,500 major crop pests and diseases in my country, and dozens of them are particularly serious. So far, chemical control is still the most important means and measures in the management of pests in my country. Among them, more than 95% use chemical pesticides, the proportion of biological pesticides is only 2% to 3%, and emulsions are very few. On the one hand, pesticides play a very important role in killing and inhibiting pests and diseases, and ensuring stable and high yields of crops. At the same time, due to unreasonable use, they will endanger the safety of the environment and human health through various means. There are many highly ...

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Problems solved by technology

The results of the field efficacy test show that the two extracts of garlic and tea seed cake have a certain control effect on red spider mites, but their persistence is poor (Ningbo Agricultural Science and Technology, 2011, 2: 13-15)

Zhao Botao and others carried out the optimization of the extraction process of the total alkaloids of Sophora flavescens and the research on the aphidicidal activity. The test of the insecticidal activity of the extract of Sophora flavescens on aphids showed that the insecticidal activity of different treatments of Sophora flavescens extract and different extraction solvents The difference is significant; with chloroform as the extraction solvent, the total alkaloid content of the obtained Sophora flavescens is the highest, and its insecticidal activity is the highest; with ethanol as the extraction solvent, the chloroform extract is compared with the concentrated solution, and the chloroform extract has no effect on the total alkaloids at the same concentration. The insecticidal activity of aphids is relatively high, which may be due to the large amount of impurities contained in the ethanol concentrate, which interferes with the insecticidal activity of the total alkaloids (China Wild Plant Resources, 2008, 27(1): 43-46)

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