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http://dx.doi.org/10.5656/KSAE.2008.47.4.407

Economic Injury Level of Myzus persicae (Homoptera: Aphididae) at Chinese Cabbage  

Jeon, Heung-Yong (Horticultural & Herbal Crop Environment Division, National Institute of Horticultural & Herbal Science, RDA)
Kang, Taek-Jun (Horticultural & Herbal Crop Environment Division, National Institute of Horticultural & Herbal Science, RDA)
Kim, Hyeong-Hwan (Horticultural & Herbal Crop Environment Division, National Institute of Horticultural & Herbal Science, RDA)
Yang, Chang-Yeol (Horticultural & Herbal Crop Environment Division, National Institute of Horticultural & Herbal Science, RDA)
Kim, Dong-Soon (Department of Plant Resources Science, College of Agriculture & Life Sciences, Cheju National University, The Research Institute for Subtropical Agriculture and Biotechnology)
Publication Information
Korean journal of applied entomology / v.47, no.4, 2008 , pp. 407-411 More about this Journal
Abstract
This study was conducted to estimate the economic injury level (EIL) and economic threshold (ET) of the green peach aphid, Myzus persicae, on Chinese cabbage (Brassica campestris var). The changes of biomass of Chinese cabbage and M. persicae density were investigated after introduction of M. persicae at different density (0, 2, 5, 10, 15, and 20 per plant; inoculated at 10d after planting). The densities of M. persicae largely increased from the above initial densities to 0, 92.3, 177.4, 406.9, 440.4, and 471.3 aphids per plant at 18d after the initial inoculation, respectively. The biomass of Chinese cabbage significantly decreased with increasing the initial inoculated density of M. persicae: 602.0, 264.2, 262.0, 109.3, 151.0, and 67.3 g in above plots with different initial densities, respectively. The relationship between cumulative aphid days (CAD) and yield loss (%) of Chinese cabbage was well described by a nonlinear logistic equation. Using the estimated equation, EIL of M. persicae on Chinese cabbage was estimated 25 CAD per plant based on the yield loss 13%, which take into account of an empirical gain threshold 5% and marketable rate 92% of spring Chinese cabbage. Also, ET was calculated at 80% of EIL: 20 aphids per plant. Until a more elaborate EIL-model is developed, the present result may be useful for M. persicae management at early growth stage of Chinese cabbage.
Keywords
Green peach aphid; Myzus persicae; Brassica campestris var; Economic injury level; Economic threshold; Gain threshold;
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