《Table 3 The effect of vetiver on population density of overwintering Chilo suppressalis (Zheng et a

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《Application of vetiver grass Vetiveria zizanioides: Poaceae(L.) as a trap plant for rice stem borer Chilo suppressalis: Crambidae(Walker) in the paddy fields》

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Data were average value±standard deviation.The same lowercase letter in the same line means the one-way ANOVA results between different treatments had no significant difference（P<005）.

The control effects of vetiver on C.suppressalis were affected by planting ages（Table 1）.The dead tillering rates of rice in the field planted with annual vetiver and biennial vetiver were both lower than those in the control field.Biennial vetiver had a stronger controlling effect on C.suppressalis than annual vetiver.The seedling protection rate of planting biennial vetiver with every 5，3 or 1 m on early rice season rice were 63.6，47.5 and 69.7%，respectively.The annual vetiver with every 5 m showed no seedling protection effect.Similar results were also found in late rice.