稻菜轮作对稻田褐飞虱和蜘蛛数量的影响

在广东省广州市花都区和白云区系统调查了稻菜轮作田、水稻连作田的水稻害虫褐飞虱Nilaparvata lugens(Stl)及其捕食性天敌蜘蛛的数量,结果表明:与水稻连作相比,花都区稻菜轮作模式总体上降低了褐飞虱数量,同期最高降低66.6%,对田间蜘蛛数量影响不明显;白云区的稻菜轮作模式也显著降低了褐飞虱的数量,同期最高降低56.3%,对蜘蛛数量的影响也不明显。稻菜轮作模式能有效降低田间褐飞虱数量,有利于水稻生产。

The effect of rice vegetable rotation cultivation on density of the brown planthopper and spiders in the fields

The density of the brown planthopper (BPH) Nilaparvata lugens (Stal) and spiders was investigated in two farming patterns: rice-vegetable rotation and rice continuous cropping, in the paddy fields of Huadu and Baiyun district of Guangzhou City. The results showed that in Huadu district, rice-vegetable rotation often reduced BPH density in paddy fields, up to 66.6% reduction compared to the control (rice continuous cropping), but the effect on the density of spiders was not obvious; in Baiyun district, rice-vegetable rotation significantly decreased BPH density, up to 56.30% reduction compared to the control, the density of spiders did not change obviously. Our investigation suggests that rice-vegetable rotation effectively reduce BPH density in paddy fields, and is beneficial to rice production.