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ISSN : 1225-0171(Print)
ISSN : 2287-545X(Online)
Korean Journal of Applied Entomology Vol.48 No.1 pp.81-86

배추 파밤나방의 경제적 피해수준 및 요방제 수준 설정


Determination of Economic Injury Levels and Control Thresholds for Spodoptera exigua on Chinese Cabbage

김선곤, 김도익, 고숙주, 강범용, 김홍재, 최경주


  Economic injury level and control thresholds for the management of beet army worm, Spodoptera exigua (Lepidoptera: Noctuidae) were evaluated on chinese cabbage of two different planting time. Two inoculation times were tested for each planting and the number of inoculated larva was 10, 20, 40, 80, respectively. Damages of leaves by first inoculation were 63.2% after eight days planting on 80 larva inoculation plot. By the second inoculation, those were below 50% after 20 days planting on the end of September. The linear relationships between population density and yield reduction were as following, Y = -10.62x + 867.9 (R² = 0.643) for 5 days and Y=-6.432x + 1074 (R² = 0.720) for 20 days. Based on these results the economic injury level was 5.4 larva for five days and 9.0 larva for 20 days per 20 chinese cabbage. The control thresholds calculated by 80% level of economic injury level were 4.3 and 7.2 larva, respectively.