单季稻区白背飞虱迁入成虫对栽期的选择性研究

9a稻飞虱系统调查资料显示 ,白背飞虱迁入成虫在单季稻区迟栽田降落量是早栽田的 1 .3～2 .7倍。这种趋迟分布不受水稻主栽品种变更和总体移栽期变化影响。四 ( 2 )代暴发期若虫数量具有同样分布趋势 ,但因受到累计迁入量和田间管理情况影响 ,与迁入成虫分布不尽相同

STUDY ON THE SELECTION OF IMMIGRATING ADULT WHITEBACKED PLANTHOPPERS TO THE PERIODS OF TRANSPLANT RICE SEEDLING IN SINGLE-CROPPING RICE REGION

The systemic investigation of rice planthoppers for 9 years showed that in single cropping rice region, the amount of immigrating adult whitebacked planthoppers in the late transplant rice seedling field was 1.3 to 2.7 times of those in the early transplant rice seedling field. The result was not affected by the main cultivated rice cultivars and the overall change of transplant seedling period. The distribution tendency of the fourth generation's nymphs in the outbreak period was the same as that of the adult, but was affected by the amount of immigrating whitebacked planthoppers and the field management, the distribution of the nymphs was a little different from that of the adult.