Biopesticide for controlling tomato powdery mildew and preparation method of biopesticide

Abstract

The invention discloses a biopesticide for controlling tomato powdery mildew and a preparation method of the biopesticide. The biopesticide is prepared from Chinese herbal medicine of liquorice, salvia chinensis, ternate buttercup root, humifuse euphorbia herb, bryophyllum pinnatum and ox penes. Biological assays shows that the bacteriostasis rate of the biopesticide to tomato powdery mildew germs is 80 percent or above, and the bacteriostasis effect is obvious; field trials show that the controlling effects of the biopesticide to tomato powdery mildew are 60 percent, 70 percent and 80 percent respectively after three times of biopesticide application, that is, the controlling effects become higher and higher along with the application times, and the pesticide effect period is long. Observation during the field trials shows that the biopesticide does no harm to tomato plants, and is high in safety.

Description

technical field [0001] The invention belongs to the field of biological pesticides, in particular to a biological pesticide for preventing and treating tomato powdery mildew. Background technique [0002] Powdery mildew damages tomato leaves, petioles, stems and fruits. At the beginning, there are small green spots on the leaf surface, and after it expands, it becomes an irregular powder spot, and white flocs grow on it, that is, mycelia, conidiophores and conidia. The initial mold layer is relatively sparse, and then becomes felt-like when it becomes denser, and the lesion expands and connects or covers the entire leaf surface. Some lesions occur on the back of the leaves, and yellow-green patches with inconspicuous edges appear on the front of the lesions, and then the whole leaves turn brown and die. Other parts are infected, and white powdery mildew spots are also produced on the surface of the diseased part. In northern my country, the fungus mainly overwinters on wi...

AI Technical Summary

Problems solved by technology

At present, chemical agents are mainly used for prevention and control. Although there is a certain control effect, due to the extensive use of chemical pesticides, various harmful bacteria have developed drug resistance, which increases the difficulty of prevention and control. At the same time, it also causes harm to the plants themselves. There are residues in melons and fruits, which endanger people's health, pollute the environment, and destroy the ecological balance

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