D3427: Among 67 medicinal plants, plant extract of Paeonia suffraticosa shows an insecticidal effect on thrips (Frankliniella occidentalis)

Besides direct feeding damage to various greenhouse crops, Frankliniella occidentalis causes indirect damage, such as mediating tomato spotted wilt virus. To date, Frankliniella occidentalis prevention has been dependent on pesticides, but this method triggers significant sied effects in agricultural environments, develops resistance to pests, and causes hardships in prevention. To resolve this issue, a substance was selected to avoid tolerance to chemical pesticide alternatives. Sixty-seven medicinal plants were inundated in water for 24h and extracted at room temperature. The extract was then administered to a Frankliniella occidentalis imago, followed by moutan was extracted treatment. A 100% insecticidal effect was observed on the first day of treatment. The selected moutan was extracted from 50% ethanol, followed by water and ethanol removal using a rotary evaporator. Next, it was pulverized through lyophilization and used after dilution with water. During indoor experiment, 40% diluted solution was spray-treated onto Frankliniella occidentalis, which showed a 100% insecticidal effect at 24h after treatment. A pot test showed a 78% insecticidal effect on the first day of treatment. The analysis of active substances with outstanding insecticidal effects and on-site validation testing is in progress. We expect that the use of the presented extract will be effective in Frankliniella occidentalis prevention.