柑桔木虱在桂林市的周年发生动态观察

Annual occurrence dynamics of Citrus psylla in Guilin City

【目的】了解桂林市柑桔木虱周年发生动态,为柑桔木虱的预警及柑桔黄龙病防控提供基础资料。【方法】2007～2010年在失管柑桔园、柑桔木虱寄主植物九里香和正常管理柑桔园观察柑桔木虱周年发生动态及世代重叠情况、不同年份高峰期及种群走势,并分析其危害严重的原因。【结果】桂林市周年有柑桔木虱发生,失管柑桔树及九里香上柑桔木虱种群数量多,下半年高于上半年,且每年有多个峰期,世代重叠;失管柑桔园从21旬开始种群数量剧增,30旬后数量减小,成、若虫高峰期出现在25～29旬;九里香上柑桔木虱主要出现在12～33旬,20旬为最高峰期。正常管理柑桔园柑桔木虱种群数量低,高峰期的33～34旬仅监测到5～30头/100梢。【结论】在桂林市失管柑桔园和绿化植物九里香上周年有柑桔木虱发生,木虱种群数量大,下半年高于上半年,世代重叠;正常管理的柑桔园柑桔木虱种群数量低,管理良好的柑桔园全年未检测到柑桔木虱。

[Objective]The present experiment was conducted to investigate the annual occurrence dynamics of Citrus psylla in Guilin City in order to provide scientific grounds for prevention and control of C.psylla and citrus Huanglongbing.[Method]From 2007 to 2010,the annual occurrence dynamics,generation overlapping status,peak occurrence period in different years and trend of C.psylla population change were observed in non-managing and normal managing orchard in Kamuning.Further,the reasons for severe damages caused by C.psylla were analyzed.[Result]C.psylla was observed to occur throughout the year in Guilin City.Many populations were observed with high density in the second half of year.Further,the multiple peaks of population were observed every year with generation overlapping in non-managing orchard and Kamuning.In non-managing orchard,the populations of Citrus psylla increased from the 21s t ten-day,and decreased from the 30t h ten-day.The peak time of Citrus psylla adult and nymph was observed from 25t h to 29t h ten-day.Citrus psylla in Kamuning occurred from 12t h to 33r d ten-day with its peak occurrence on 20t h ten-day.The number of Citrus psylla populations was the lowest in normal managing orchards,and only 5-30 psylla/100 branches were present in peak period of 33r d to 34t h ten-day.[Conclusion]A large number of Citrus psylla was found every year in non-managing orchard and Kamuning in Guilin City,and the number of Citrus psylla was greater in the first half of year than the later half with generation overlapping.There were less Citrus psylla in normal managing orchard,while it was not detected throughout the whole year in well-managed orchard.