Eugenol aqueous emulsion and its preparation method and application in preventing and treating tobacco fungal diseases

Abstract

The invention provides eugenol water emulsion, which comprises the following components in mass content: eugenol 20-30%, emulsifier 1-5%, thickener 0.1-0.3%, antifreeze agent 3-5%, defoamer 0.1% ~0.5% and balance water. The application of the eugenol water emulsion of the present invention in the prevention and treatment of tobacco fungal diseases. The inhibition rate of the eugenol aqueous emulsion provided by the invention to the tobacco black shank bacteria is 52.56%-97.44%, and the inhibition rate of the eugenol aqueous emulsion to the red spot bacteria is 35.82%-65.67%. It shows that it can effectively control tobacco black shank and tobacco red spot disease. Moreover, eugenol is a biogenic pesticide, which is easy to degrade in the environment and has the characteristics of environmental friendliness. At the same time, the prepared emulsion in water is an environmentally friendly formulation, which greatly reduces the phytotoxicity of crops, and further improves the safety of agricultural products.

Description

technical field [0001] The invention belongs to the field of biological pesticides, and in particular relates to a eugenol aqueous emulsion, a preparation method thereof, and an application in preventing and controlling 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 black shank mostly occurs in the adult plant stage, and a few in the seedbed stage. When the seedlings are infected, black stains appear at the base of the stems, or the disease spreads from the bottom leaves to the young stems along the petioles, causing the seedlings to fall off. When the humidity is high, the disease grows with white mycelium, and the seedlings die in pieces. These adverse changes directly or indirectly affect the quality and yield formation factors, and finally cause serious loss of tobacco leaves. Tobacco red spot disease is commonly known as "red spot" in Shan...

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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