These two extracts may be jointly developed into new biological pesticides

In order to better develop and utilize the two plant resources of Phytolacca chinensis and Ginkgo biloba, researchers from the School of Chemistry and Biological Engineering of Hunan University of Science and Technology studied Ginkgo biloba sarcotesta (Gbs) and Phytolacca americana leaf (Pal). ) The single and compound extracts have tested and compared the insecticidal activity of Plutella xylostella.

The results showed that the extracts of Ginkgo biloba and Pokeweed leaves both showed good killing activity against Plutella xylostella, and the killing activity increased with the treatment time and the concentration of the extract. Ginkgo biloba at each concentration The insecticidal activity of Plutella xylostella was better than that of Pokeweed leaf extract. After 72 hours of treatment at a concentration of 8 mg/mL, the corrected mortality of Plutella xylostella was 74.7% (Gbs) and 64.8% (Pal), respectively. LC50 The values are 2.95 mg/mL (Gbs) and 6.09 mg/mL (Pal); the plutella xylostella killing activity of the compound varies with the ratio of the two, and the best ratio is 1:11 (Pal:Gbs) , LC50 value is 1.24 mg/mL (lower than the LC50 value of each of the two), virulence index is 491.13 mg/mL (significantly higher than the sum of the two single-dose virulence indexes), and the co-toxicity coefficient is 152.92 (indicating The compound has obvious synergistic effect).

The above research results can provide experimental basis for the collaborative development of new biological pesticides by using Pokeweed leaves and Ginkgo biloba exotesta.

Previously, the project "The Discovery and Application of Agricultural Fungicide Activity of "Yingguo" and "Yintai"" led by Professor Meng Zhaoli of Qingdao Agricultural University (formerly Laiyang Agricultural College) won the second prize of 2003 National Science and Technology Progress Award. The project first discovered and confirmed that the roots, stems, leaves, and fruits of Ginkgo biloba contain agricultural bactericidal and antibacterial substances. Ginkgo biloba with higher activity was isolated and purified from the ginkgo fruit. Using this as the lead compound, we synthesized "Yinguo" (originally "Lvdi", o-allylphenol) and "Yintai" (4-butyrylphenol) agricultural fungicides, and completed toxicity tests and environmental safety assessments. , Field efficacy test and small-scale and pilot-scale research, obtained temporary pesticide registration certificate, completed production technology transfer, and obtained large-scale application, which opened up a new way for the research of botanical pesticides in my country, but it was not transferred to formal registration .