A kind of fungicide for tobacco black shank and its preparation method and application

Abstract

The invention discloses a bactericide for tobacco black shank. The bactericide comprises, by weight, 90%-96% of cortex phellodendri extract, 3%-9% of methyl silicone oil and no more than 1% of epichlorohydrin. The cortex phellodendri extract is prepared from cortex phellodendri by the aid of ethanol reflux extraction processes. The invention further provides a method for preparing the bactericide for the tobacco black shank. The bactericide and the method have the advantages that as shown by field tests, effects of preventing and treating more than 80% of cases of tobacco black shank can be realized by the bactericide, obvious effects can be realized by the bactericide, and the bactericide is high in efficiency and low in toxicity when used for preventing and treating the black shank of tobacco in fields, is free of environmental pollution and has extremely important significance in the aspects of improving the quality of tobacco leaves, guaranteeing the safety of the tobacco leaves and keeping the ecological balance; unique effects can be realized by two extraction technologies of the method, and the method is irreplaceable; the method includes simple processes and has the possibility of mass production, the time and labor can be saved by the aid of the method, and the bactericide is easy to produce by the aid of the method.

Description

technical field [0001] The invention belongs to the field of plant disease prevention and control, and in particular relates to a fungicide for tobacco black shank and its preparation method and application. Background technique [0002] Tobacco black shank Phytophthoraparasitica var.nicotianae (Vann Breda de Haan) is one of the most devastating major diseases in tobacco production. The average incidence rate of tobacco in China is 5%-12%, and the incidence rate of severe fields is as high as 75%. Once black shank occurs, it will spread rapidly, endangering the health of tobacco plants, even causing the crop failure of tobacco fields, seriously affecting the production of tobacco leaves, and causing huge economic losses to tobacco production. [0003] At present, tobacco black shank disease is mostly controlled by chemical agents. The use of chemical pesticides will not only seriously affect the health of the tobacco plant itself, but also lead to drug resistance of various ...

AI Technical Summary

Problems solved by technology

However, the botanical fungicidal pesticides currently used for tobacco black shank still have the following deficiencies: 1) pure botanical extracts, whose components are easily degraded by the field environment, especially in the natural field environment, when exposed to light It is easier to degrade, that is, it will fail quickly and the drug effect will be unstable; 2) If it is washed by rain or diluted by dew, the effect will be worse

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