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Evaluating the potential of the extract of Perilla sp. as a natural insecticide for Bemisia tabaci (Hemiptera: Aleyrodidae) on sweet peppers
Authors:Soowan Kim  Minhyung Jung  Yoon‐Jae Song  Se Chan Kang  BaeYong Kim  I‐Jin Choi  Hong Geun Kim  Doo‐Hyung Lee
Affiliation:1. Department of Life Sciences, Gachon University, Seongnam‐si, Gyeonggi‐do, Republic of Korea;2. Department of Oriental Medicine Biotechnology, Kyung Hee University, Yongin‐si, Gyeonggi‐do, Republic of Korea;3. Phylus Co. Ltd., Danyang-gun, Chungcheongbuk‐do, Republic of Korea;4. Department of Urban Agriculture, Seoul Metropolitan Agricultural Technology Center, Seoul, Republic of Korea
Abstract:The sweetpotato whitefly, Bemisia tabaci Gennadius (Hemiptera: Aleyrodidae), is a major pest on greenhouse crops including sweet pepper (Capsicum annuum L.), which is one of the leading greenhouse crops in South Korea. Synthetic insecticides, especially the neonicotinoids, have been used to conventionally control this pest. There have been continuous efforts to develop plant‐derived compounds as insecticides, deterrents, and repellents to reduce spraying synthetic insecticides. To develop new plant‐extract insecticides, we investigated the insecticidal effects of Perilla sp. (Perilla frutescens var. crispa) extract on B. tabaci in laboratory conditions. The Perilla sp. extract induced 90 % mortality within one hour, but phytotoxicity symptoms on sweet pepper leaves were also observed. We monitored the population change and spatial distribution of adult B. tabaci in an experimental sweet pepper greenhouse using yellow sticky traps, and analyzed distribution patterns by spatial analysis with distance indices (SADIE). Based on monitoring data and SADIE analysis, we concluded that B. tabaci aggregated near the greenhouse entrances, and it showed aggregation and association pattern as time passed. Therefore, we recommend spraying Perilla sp. extract near the entrances or wild host before the pest population penetrates. It will be one of the alternative pest management strategies to reduce B. tabaci population with fewer negative effects from chemical insecticide. Further study is required to reduce the phytotoxicity symptoms from Perilla sp. extract spray and insecticidal effect should be evaluated under field conditions.
Keywords:Perilla frutescens var. crispa  plant extract  SADIE  sweetpotato whitefly
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