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Determination of Economic Injury Levels (EILs) and Control Thresholds (CTs) of Aphis egomae (Hom.: Aphididae) in Green Perilla  

Choi, Yong-Seok (Bioenvironment Research Division, Chungnam Agricultural Research & Extention Services)
Park, Deok-Gi (Byinsect Co. LTD., Kongju National Univ.)
Han, Ik-Soo (Department of Horticulture, Kongiu National Univ.)
Choe, Kwang-Ryul (Department of Applied Biology, Chungnam National Univ.)
Publication Information
Korean journal of applied entomology / v.45, no.3, 2006 , pp. 317-325 More about this Journal
Abstract
According to the preceding survey on insect pests of the green perilla, Perilla frutescens var. japonica HARA, The major pests were Aphis egomae Shinji, Pyrausta panopealis (Walker), Tetranychus urticae Koch, Polyphagotarsonemus lotus Banks, Tetranychus kanzawai Kishida at Guemsan, Chungnam, 2004. Aphis egomae causes nearly 100% injury of the green perilla in uncontrolled green houses. A field study was conducted to estimate economic injury levels (EILs) and control thresholds (CTs) for A. egomae injuring green perilla in green houses. Different densities of A. egomae ranged from 1 to 80 aphids per 100 plants in early inoculation. The mean injurying rate of plant was 2.4% to 40.5% at the end of June at differently inoculated levels. The economic loss time calculated by the ratio of cost managing aphid to market price (C/V) (C: cost managing aphid, V: Market price) in early season (from May to 13. June) was 5.8% and in peak season (from 13. June to 30. June) was 9.3%. Economic injury level in early and peak season was 5.3 aphids per plant and economic injury levels in peak season were 0.6 aphids per plant and 7.6% injured rate of plant. The control thresholds calculated by 80% level of economic injury level in peak season were 0.5aphids per plant and 6.1% injury rate of plant, respectively.
Keywords
Green perilla; Perilla frutescens; Aphis egomae; Economic injury Levels (EILs), Control threshold (CTs);
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