Rice plant compounds regulating infestation behaviors of rice-ear bugs

引起稻穗蝽侵入稻田的挥发性物质组成在一天内和水稻发育过程中发生变化。红纹细蛾和黑纹细蛾都是昼夜活动的昆虫，但黑纹细蛾的活动期明显长于暗期，而黑纹细蛾的活动期明显长于暗期。因此，稻曲虫在稻田的入侵可能受水稻挥发性成分的日变化和稻曲虫的日侵害活动的影响。此外，还发现几种水稻化合物对蝽类昆虫取食行为的各个环节都有调节作用。因此，调节在害虫侵染行为中起作用的活性化合物可导致防止害虫对水稻的侵染。

Composition of rice plant volatiles which cause invasion of rice-ear bugs into paddy fields changed during a day as well as rice development. Although both Trigonotylus caelestialium and Stenotus rubrovittatus were nocturnal-diurnal insects, the former was more active in the photophase than in the scotophase and the latter was more active in the scotophase than in the photophase. Therefore, invasion of the bugs into paddy fields may be influenced by changes of volatile composition from rice during a day and diurnal infestation activities of the bugs. In addition, it was suggested that each step of feeding behavior of bugs was regulated by several rice compounds. Therefore, regulating active compounds which play roles in infestation behaviors of the bugs may lead to prevent infestation of rice by the bugs.