Plant insecticide and its preparing method

Abstract

The invention discloses a botanical pesticide prepared by the following steps: immersing plant materials kuhseng, hellebore and lilac daphne in ethanol; press filtering, extracting and crystalling to obtain three discard solutions and three alkaloids of kuhseng, hellebore and lilac daphne; wherein, pesticide B is prepared by concentrating the three discard solutions and remixing emulsifiable concentrates in the following ratio: 3-9.6% by weight of kuhseng concentrated solution, 3-9.6% by weight of hellebore concentrated solution and 3-9.6% by weight of lilac daphne concentrated solution. According to the invention, the pesticide is a pure natural botanical pesticide that has the advantages of no pollution to environment, no residue, easy decomposition, no easy generation of drug tolerance, benefit and no harm to the crop, stimulation to the growth effect of fruit tree and vegetable of the crops. The vegetable insecticide has an obvious disinfestation effect to mythimna separate, aphid, fruit borer, red spider, cabbage worm, pear leaf psylla, leaf mite, etc. The vegetable insecticide has no harm to the crop and has excellent function for killing or inhibiting the fungi, and the effectiveness ratio can be above 90%.

Description

[0001] This application is a divisional application of "Application Date 2006.12.25, Application No. 200610170802.2, Invention Name: A Plant Pesticide and Its Preparation Method" technical field [0002] The invention relates to a pesticide and a preparation method thereof, in particular to a plant insecticide and a preparation method thereof. Background technique [0003] At present, most of the insecticides currently used in my country are chemical insecticides, which have low efficacy and long residual toxicity period, and have varying degrees of adverse effects on the growing environment of crops and the health of humans and animals. In addition, although there are research reports on plant insecticides, there are generally disadvantages such as slight toxicity, slight residue and slow effect. Contents of the invention [0004] The object of the present invention is to provide an economical and practical plant insecticide with high efficiency, no residual toxicity, wid...

AI Technical Summary

Problems solved by technology

[0003] At present, most of the insecticides currently used in my country are chemical insecticides, which have low efficacy and long residual toxicity period, and have varying degrees of adverse effects on the growing environment of crops and the health of humans and animals.

In addition, although there are research reports on plant pesticides, there are generally disadvantages such as slight toxicity, slight residue and slow effect.

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