Screening of Plant Extracts and Identification of their Insecticidal Metabolites against Myzus persicae
2018
Yang, S.Y., LG Farmhannong, Nonsan, Republic of Korea | Lim, D.J., Chonnam National University, Gwangju, Republic of Korea | Kim, Y.H., Chonnam National University, Gwangju, Republic of Korea | Kim, I.S., Chonnam National University, Gwangju, Republic of Korea
BACKGROUND: Green peach aphid (Myzus persicae) is an insect pest that significantly affects crop production. A number of pesticides have been used for aphid control, but their concerns on insect resistance and food safety have required alternative methods for pest management. In an effort to find for an alternative approach to aphid control, we screened plants extracts and examined their potentiality as insecticidal bio-resources. METHODS AND RESULTS: Two hundred and ninety eight plant extracts were examined for insecticidal activity against the aphid, and the best candidate among them was chosen for further study. The extracts from Cinnamomum camphora was determined to be the best candidate exhibiting insecticidal activity more than 60% at a level of 1,000 μg/mL. GC/MS analyses detected camphor, borneol, 4-terpineol, alpha-terpineol and caryophyllene oxide as major compositions from the extracts obtained by hydrodistillation. Caryophyllene oxide exhibited the highest insecticidal activity with a LC50 value of 237 μg/mL. Camphor lowered significantly the LC50 value of caryophyllene oxide and increased largely its concentration in aphid, suggesting that camphor played a role in enhancing the insecticidal activity of caryophyllene oxide. CONCLUSION: This study suggested that camphor and caryophyllene oxide may be used as an insecticidal bio-resource for insect control against green peach aphid.
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