苏丹草和香根草作为诱虫植物对稻田二化螟种群的抑制作用评估

室内测试了苏丹草和香根草对二化螟的产卵选择性和幼虫存活的影响,在田间进行了苏丹草和香根草控害效果的初步试验。结果表明,二化螟雌成虫对苏丹草和香根草均表现出较强的产卵选择性,产在苏丹草和香根草上的卵量分别是产在水稻上的3.02和4.56倍。两种诱虫植物均对二化螟幼虫具致死作用,二化螟幼虫在两种寄主上不能完成生活史。田间试验表明两种诱虫植物围绕的水稻小区内二化螟枯心率显著低于试验区外20m的对照小区。

Potential Function of Sudan Grass and Vetiver Grass as Trap Crops for Suppressing Population of Stripped Stem Borer, Chilo suppressalis in Rice

Experiments were conducted to examine the effect of Sudan grass, Sorghum sudanense and reriver grass, Vetieria zizanioides on the oviposition preference and larval survival of stripped stem borer, Chilo suppressalis in lab, as well as the control effect of the two grasses used as trap crops for suppressing population of C. suppressalis in rice field. The borer female adults preferred to lay eggs on Sudan and vetiver grass in oviposition free selection tests, the number of eggs laid on Sudan and vetiver grass plants were 3.02 and 4.56 times of the number of eggs laid on rice plants, respectively. Both of Sudan and vetiver grass had lethal effect and C. suppressalis larvae could not finish their life cycle as the borer larvae fed on two tested hosts. Field experiment showed in the rice plot surrounded by the two tested hosts had significantly lower dead heart rate than that in rice monocrop plots 20 m away from the treatment block.