《Table 1 Distribution distances (densities) of the traps for S.litura in tobacco field》

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《Effect of Trap Space Layout on Trapped Number of Spodoptera litura in Tobacco Field》

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Tests on the layout distances（densities）of the traps A total of 5 tobacco-growing plots with the planting area over 3.3 hm2were selected from the same area with flat terrain surrounded by mountains，woods or other crops.The traps were evenly distributed in the plots at the hanging height of 2.0 m with the distribution semi-diameter of 10.0 m（linear distance of 20.0 m between2 traps），semi-diameter of 20 m（linear distance of 40.0 m between 2 traps），semi-diameter of 30.0 m（linear distance of60.0 m between 2 traps），semi-diameter of 40.0 m（linear distance of 80.0 m between 2 traps）and semi-diameter of 50.0 m（linear distance of 100.0 m between 2 traps）.The number of trapped S.litura was recorded every 7 d（the distribution layout was shown in Table 1），and the statistical period was 28 d.