Method for preparing agent for preventing and treating red spider of Chinese chestnut using extract from vervain family flowers

Abstract

The invention relates to a method for prevention and control of diseases and insect pests in fruit trees, in particular to the method for preparing a medicament for prevention and control of spider mites on chestnut by using an extract from flower of vitex negundo. The method comprises the following steps: the flower of the vitex negundo is arranged in a container, ethanol with the concentration of more than 75 percent is added in the container for extraction, the still placement is carried out for 10 to 14 hours, and the mixture is then filtered to remove the residues, thereby preparing the medicament of the flower of the vitex negundo. The flower of the vitex negundo is widely distributed in the areas such as Hebei, Shanxi, Henan, Shanxi, Gansu, Sichuan and Yunnan provinces and is a wild plant, the resources are abundant, the direct extraction method by using the ethanol is simple and the extract is safe to human and livestock. As the medicament contains a great amount of volatile substances, the medicament has great potential as a plant acaricide.

Description

technical field [0001] The invention relates to a method for preventing and controlling fruit tree diseases and insect pests, in particular to a method for preparing a medicament for preventing and controlling chestnut spider mite by using Vitex flower extract. Background technique [0002] Chestnut red spider, also known as Acerola mite, Chestnut mite, belongs to Arachnida, Acaridae, Tetranychuidea, Tetranychidae. Distributed in my country's Beijing, Hebei, Shandong, Jiangsu, Anhui, Zhejiang, Jiangxi and other provinces, cities and many countries in the world. Hosts include tree species such as chestnut, chestnut, oak, spruce, fir, and oak. It is the main pest mite that damages the leaves of chestnut trees. Acerola mite sucks leaves with juveniles, nymphs and adults. Chestnut leaves are damaged with small pale spots, especially concentrated on both sides of the veins. In severe cases, the leaves are pale yellow, scorched and dead, the tree is weak, and the chestnut seeds...

AI Technical Summary

Problems solved by technology

[0003] Although most of the acaricides currently used at home and abroad are high-efficiency and low-toxic compounds and are relatively easy to decompose, most of them are nerve agents, and their toxicity to mammals cannot be ignored, and they also have a certain impact on the environment. At the same time, pest mites are prone to develop resistance

Nevertheless, at present, the prevention and control of mites mainly relies on chemical pesticides, but the long-term use of chemical pesticides has attracted people's attention. Finding new pesticides with high efficiency, low toxicity, and low residue has become a major issue in current pesticide research. focus and focus

Research on the pollution-free and safe new botanical acaricides with high efficiency, long-acting, broad-spectrum, less environmental pollution, less damage from natural enemies, effective in all life stages (different mite states) of harmful mites, and not easy to produce resistance still less

So far, there is no report on the use of botanical insecticides to control chestnut spider mite