Control Thresholds for Managing Common Cutworm, Spodoptera litura (Faricius) (Lepidoptera: Noctuidae) on Chinese Cabbage
2011
Choi, D.S., Jeonnam Agricultural Research and Extension Service, Naju, Republic of Korea | Kim, D.I., Jeonnam Agricultural Research and Extension Service, Naju, Republic of Korea | Kim, S.G., Jeonnam Agricultural Research and Extension Service, Naju, Republic of Korea | Ko, S.J., Jeonnam Agricultural Research and Extension Service, Naju, Republic of Korea | Kang, B.R., Jeonnam Agricultural Research and Extension Service, Naju, Republic of Korea | Kim, S.S., Sunchon National University, Sunchon, Republic of Korea
This study aimed to estimate control thresholds for managing common cutworm, Spodoptera litura Faricius (Lepidoptera: Noctuidae) at different larval densities and growth stages of Chinese cabbage in field conditions. The percent yield reduction (Y) of Chinese cabbage infested by different densities of S. litura (X, no. of larvae/100 plants) for three weeks were estimated by Y=-21.85X + 1300 (R²=0.997) 5 days after transplanting and Y=-12.1X + 1382 (R²=0.998) 20 days after transplanting. Based on the relationships between the densities of S. litura larvae and the yield index of chinese cabbage, the number of larvae (2nd to 3rd instar) which caused 5% loss of yield was estimated as 2.9/100 plants 5 days after transplanting, and 5.6/100 plants 20 days after transplanting.
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