摘要
水稻一代二化螟为害程度与虫口、栽秧密度、施氮水平密切相关,而以虫口密度为主导因素.3因素都达到高水平时,螟害猖獗;而虫少、稻苗较稀疏、肥足,则螟害轻微,稻谷产量高.在一代二化螟常灾区,重点防治早栽、茂密、虫多、肥足的稻区,经济、生态及社会效益均显著.
The levels of injury caused by Chilo suppressalis(Walker)to rice plants are closely re-lated to the population density of the pest,the density of the rice plants and N application,the first factor being predominant.When all three factors reach high level,severe injury willnormally result.In contrast,lower population of both the pest and the crop accompaniesby adequate fertilization tend to give a high yield.In the rice-producing regions where inju-ry frequently occurs,emphasis of pest control is recommended to be placed on earlyplantedfields with plentiful fertilizer and high pest density so as to gain better economical,ccological and social benefits.
出处
《西南农业大学学报（自然科学版）》
CSCD
1991年第4期387-389,共3页
Journal of Southwest Agricultural University
关键词
水稻
二化螟
危害
虫数
密度
氮肥
lowland rice
Chilo suppressalis
disasters
insect density
planting dentance
/N fertilizer
