贵州省锦屏县近年稻纵卷叶螟发生规律

Occurrence Character of Cnaphalocrocis medinalis in Jinping County,Guizhou Province During the Past Years

对贵州省锦屏县2006～2010年稻纵卷叶螟的迁入时期、迁入量、田间成虫及幼虫发生动态进行了分析,以研究该虫在当地的发生规律。结果表明:锦屏县2006～2010年稻纵卷叶螟为害盛期与水稻分蘖期、拔节期、孕穗期吻合,但不同年份稻纵卷叶螟发生程度不同。2006～2010年田间最高蛾量分别达到8 874、1 648、4 367、2 817和1 222头/667m2。高蛾量的发生天数在不同年份间差异明显,2006～2008年田间蛾量≥400头/667m2的天数分别达到27、30和35 d,而2009年和2010年只有7 d。田间蛾量高且高蛾量发生时间长是造成稻纵卷叶螟暴发成灾的原因。

To summarize the regularities of Cnaphalocrocis medinalis,the time and quantity of immigration as well as the dynamics of adult and larva in rice fields in Jinping County,Guizhou Province were analyzed from 2006 to 2010 in the present work.The results showed that peak of C.medinalis population was in accordance with tillering stage,jointing stage and booting stage,however the damages considerably varied during the past years.The adult peaks in the fields were 8 874,1 648,4 367,2 817,and 1 222 / 666.7 m^2,consecutively during 2006-2010.Further,the accumulated days of peak adults were significantly different during the investigated year,and the accumulated days that adult number more than 400 /666.7 m^2 were 27 d,30 d and 35 d consecutively from 2006 to 2008,however,only 7 d in both 2009 and 2010.The main reasons caused serious outbreak of C.medinalis were the large number of C.medinalis and its longer time of duration.