摘要
本文通过测定稻株的不同受害程度及田间不同虫口密度与产量损失的相互关系,得出每头三、四、五龄稻纵卷叶螟幼虫所造成的产量损失分别为0.188、0.180、0.235克;在这个基础上,作者根据防治收益不少于防治费用的经济原则,综合考虑各种自然因素和社会因素的影响效应,利用稻纵卷叶螟自然种群生命表的有关资料,求出防治指标为每亩13370粒卵或每亩一至二龄幼虫6574头。
In this paper,the relationships between larval density of rice leafroller Cnaphalocrocis medinalis Guenée,injury of rice plant,and riceyield loss was studied in Fuzhou suburb,Fujian Province.The resultsshowed that the rice yield losses caused by each third,fourth,andfifth instar larva were 0.188,0.180,and 0.235g,respectively.Basedon the synthetic consideration of economic principle that the benifitmust not be less than the cost of control,and effects of a series ofnatural and social factors,the action threshold of rice leaf roller wasdetermined as 13370 eggs/mu or 6574 lst-2nd larvae/mu,according tothe data analysis of the natural population life table of this insect.
出处
《植物保护学报》
CAS
CSCD
北大核心
1990年第1期17-22,共6页
Journal of Plant Protection
关键词
水稻
稻纵卷叶螟
防治指标
Cnaphalocrosis medinalis——action threshold
