Eugenol aqueous emulsion, preparation method thereof and application thereof in controlling mycosis of tobacco

Abstract

The invention provides a eugenol aqueous emulsion, comprising the following components in mass contents: 20-30% of eugenol, 1-5% of an emulsifying agent, 0.1-0.3% of a thickening agent, 3-5% of an antifreezing agent, 0.1-0.5% of a defoamer and the balance of water. The invention also provides application of the eugenol aqueous emulsion in controlling mycosis of tobacco. The inhibition rate of the eugenol aqueous emulsion provided by the invention on black shank of tobacco is 52.56%-97.44%, and the inhibition rate of the eugenol aqueous emulsion on brown spot of tobacco is 35.82%-65.67%, showing that the eugenol aqueous emulsion can effectively control black shank of tobacco and brown spot of tobacco. The eugenol is biological source pesticide, easily degrades in the environment and has the characteristic of environmental friendliness, and simultaneously the prepared preparation aqueous emulsion is an environment-friendly form, thereby greatly reducing chemical injury to crops and further improving the safety of agricultural products.

Description

technical field [0001] The invention belongs to the field of biopesticides, and in particular relates to eugenol aqueous emulsion, a preparation method thereof and an application in preventing and treating tobacco fungal diseases. Background technique [0002] Tobacco black shank, also known as tobacco blight, is one of the most devastating diseases in tobacco production. Tobacco farmers call it "black stem madness", "black root" or "aconitum disease". Tobacco black shank mostly occurs at the adult plant stage, and a few at the seedbed stage. When the seedlings are infected, dirty black spots appear at the base of the stem, or the disease spreads from the bottom leaves along the petioles to the young stems, causing the seedlings to stumble. When the humidity is high, the diseased part is covered with white hyphae, and the seedlings die in pieces. These adverse changes directly or indirectly affect the quality and yield formation factors, and finally cause serious losses of...

AI Technical Summary

Problems solved by technology

[0003] In recent years, the prevention and control of tobacco diseases mainly includes chemical control and biological control. Chemical pesticides have good effects in a short period of time, but they are easy to cause drug resistance and drug residues, which have a greater impact on the ecological environment; the biological control of tobacco black shank mainly includes Bacteria, actinomycetes biocontrol bacteria, utilization of fungal biocontrol bacteria, screening of cell mutants and improving the resistance of tobacco to grass black shank through induction, etc. Bacteria include Bacillus and Pseudomonas, which mainly dissolve the hyphae of tobacco black shank by producing antibiotics

The use of biological control of tobacco black shank can not only protect the environment, but also prevent the development of drug resistance of black shank bacteria, and will not cause any harm to the plant itself. However, the cost of biological control methods is relatively high, the preparation method is complicated, and the time Can't improve internally

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