《Table 3 Effects of different layout distances (densities) of traps on the trapped number of S.litur

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

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Number

As shown in Table 3，the average trapped number per site showed that the average trapped number per site was the highest in May when the semi-diameter of trap setting was 50.0 m（distribution density of 5 traps/3.3 hm2），and the highest number reached24.8.Moreover，with the decrease of the setting semi-diameter（increase of densities），the average trapped number per site decreased，indicating that the average trapped number per site was large when the setting density of traps was small in the field.